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                    <OTText id="f1954e8f-a780-11de-9e91-d3e5b9c2fcbf" text="Please check ALL classes in which you have previously done SAM or RI-ITEST activities." />
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                    <OTText id="f198f81c-a780-11de-9e91-d3e5b9c2fcbf" text="1. What are computer models used for?" />
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                    <OTChoice id="f198f81d-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
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                        <OTText id="f198f81e-a780-11de-9e91-d3e5b9c2fcbf" text="making predictions" />
                        <OTText id="f198f81f-a780-11de-9e91-d3e5b9c2fcbf" text="testing theories" />
                        <OTText id="f198f820-a780-11de-9e91-d3e5b9c2fcbf" text="designing things" />
                        <OTText id="f1994641-a780-11de-9e91-d3e5b9c2fcbf" text="making predictions AND testing theories" />
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                <OTQuestion id="f1999463-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_2">
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                    <OTText id="f1999464-a780-11de-9e91-d3e5b9c2fcbf" text="2. What is true of the best computer models?" />
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                    <OTChoice id="f1999465-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
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                        <OTText id="f1999466-a780-11de-9e91-d3e5b9c2fcbf" text="They are a completely accurate reproduction of what they are modeling." />
                        <OTText id="f199bb77-a780-11de-9e91-d3e5b9c2fcbf" text="They are a completely accurate reproduction of what they are modeling, except they are scaled differently (smaller or bigger than the real thing)." />
                        <OTText id="f199bb78-a780-11de-9e91-d3e5b9c2fcbf" text="They may not be a completely accurate reproduction of what they are modeling, but they produce reasonably good results that come close to matching reality." />
                        <OTText id="f199bb79-a780-11de-9e91-d3e5b9c2fcbf" text="They may not be a completely accurate reproduction of what they are modeling, but they look exactly like what they are modeling." />
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                <OTQuestion id="f199e28a-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_3">
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                    <OTText id="f199e28b-a780-11de-9e91-d3e5b9c2fcbf" text="3. In which case does it make sense to use a computer model?" />
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                    <OTChoice id="f199e28c-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
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                        <OTText id="f199e28d-a780-11de-9e91-d3e5b9c2fcbf" text="to conduct an experiment that would be too expensive to do in real life" />
                        <OTText id="f199e28e-a780-11de-9e91-d3e5b9c2fcbf" text="to conduct an experiment that would be too dangerous to do in real life" />
                        <OTText id="f19a099f-a780-11de-9e91-d3e5b9c2fcbf" text="to conduct an experiment that would take too long to do in real life" />
                        <OTText id="f19a09a0-a780-11de-9e91-d3e5b9c2fcbf" text="all of the above" />
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                <OTQuestion id="f19a09a1-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_4">
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                    <OTText id="f19a30b2-a780-11de-9e91-d3e5b9c2fcbf" text="4. What is the most likely reason the results from a model may NOT perfectly match reality?" />
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                    <OTChoice id="f19a30b3-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
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                        <OTText id="f19a30b4-a780-11de-9e91-d3e5b9c2fcbf" text="All the factors that might affect the model were not considered." />
                        <OTText id="f19a57c5-a780-11de-9e91-d3e5b9c2fcbf" text="The user set the controls or initial parameters so that the starting conditions for the model were unrealistic." />
                        <OTText id="f19a57c6-a780-11de-9e91-d3e5b9c2fcbf" text="The user didn't interpret the results properly." />
                        <OTText id="f19a7ed7-a780-11de-9e91-d3e5b9c2fcbf" text="There was a problem with the computer processor." />
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                <OTQuestion id="f19aa5e8-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_5">
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                    <OTText id="f19aa5e9-a780-11de-9e91-d3e5b9c2fcbf" text="5. A liquid CANNOT be squeezed into a significantly smaller volume. This is because molecules in a liquid" />
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                    <OTChoice id="f19aa5ea-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
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                        <OTText id="f19aa5eb-a780-11de-9e91-d3e5b9c2fcbf" text="move too fast to be compressed into a smaller volume" />
                        <OTText id="f19aa5ec-a780-11de-9e91-d3e5b9c2fcbf" text="are bigger than gas molecules" />
                        <OTText id="f19aa5ed-a780-11de-9e91-d3e5b9c2fcbf" text="have very little space between them" />
                        <OTText id="f19aa5ee-a780-11de-9e91-d3e5b9c2fcbf" text="flow freely through their container" />
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                <OTQuestion id="f19accff-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_6">
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                    <OTText id="f19acd00-a780-11de-9e91-d3e5b9c2fcbf" text="6. What happens as water boils?" />
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                    <OTChoice id="f19acd01-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
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                        <OTText id="f19acd02-a780-11de-9e91-d3e5b9c2fcbf" text="The water molecules overcome their attractions for each other." />
                        <OTText id="f19af413-a780-11de-9e91-d3e5b9c2fcbf" text="The covalent bonds between the hydrogen and oxygen atoms that make up the water molecules are broken." />
                        <OTText id="f19b1b24-a780-11de-9e91-d3e5b9c2fcbf" text="The attractions between the water molecules are weakened." />
                        <OTText id="f19b4235-a780-11de-9e91-d3e5b9c2fcbf" text="The hydrogen and oxygen atoms that make up the water molecules are destroyed." />
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                <OTQuestion id="f907e4b6-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_7">
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                    <OTText id="f9080bc7-a780-11de-9e91-d3e5b9c2fcbf" text="7. Heating a solid eventually causes melting. This is because heating a solid" />
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                        <OTText id="f9080bc9-a780-11de-9e91-d3e5b9c2fcbf" text="gives the atoms more kinetic energy, so they can overcome some of their attractions" />
                        <OTText id="f90832da-a780-11de-9e91-d3e5b9c2fcbf" text="loosens the material between the atoms, allowing them to move past each other" />
                        <OTText id="f90832db-a780-11de-9e91-d3e5b9c2fcbf" text="creates a chemical reaction that turns the solid into a liquid" />
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                <OTQuestion id="f90859ec-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_8">
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                    <OTText id="f90859ed-a780-11de-9e91-d3e5b9c2fcbf" text="8. When nitrogen gas is cooled to a low enough temperature, it becomes a liquid. Why?" />
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                    <OTChoice id="f90859ee-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
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                        <OTText id="f90859ef-a780-11de-9e91-d3e5b9c2fcbf" text="The energy of the nitrogen gas decreases, and the nitrogen molecules stop moving." />
                        <OTText id="f90859f0-a780-11de-9e91-d3e5b9c2fcbf" text="The cold energy of the nitrogen gas increases, and the nitrogen molecules bind together." />
                        <OTText id="f9088101-a780-11de-9e91-d3e5b9c2fcbf" text="A chemical reaction happens, and the nitrogen gas changes into water." />
                        <OTText id="f9088102-a780-11de-9e91-d3e5b9c2fcbf" text="The nitrogen molecules move more slowly and don't have enough energy to overcome their attractive forces." />
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                <OTQuestion id="f908a813-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_10">
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                    <OTText id="f908a814-a780-11de-9e91-d3e5b9c2fcbf" text="9. One substance can have a higher boiling point than another substance. This is because the molecules of a substance with a higher boiling point" />
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                    <OTChoice id="f908a815-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
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                        <OTText id="f908a816-a780-11de-9e91-d3e5b9c2fcbf" text="have weaker attractions to each other" />
                        <OTText id="f908cf27-a780-11de-9e91-d3e5b9c2fcbf" text="have stronger attractions to each other" />
                        <OTText id="f908cf28-a780-11de-9e91-d3e5b9c2fcbf" text="are harder to break down into atoms" />
                        <OTText id="f908cf29-a780-11de-9e91-d3e5b9c2fcbf" text="do not absorb heat well" />
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                <OTQuestion id="f908f63a-a780-11de-9e91-d3e5b9c2fcbf" name="http://ri-itest.concord.org/SAMActivities/MCI-chem/ChemMCI_v2/page2.cml">
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                    <OTText id="f908f63b-a780-11de-9e91-d3e5b9c2fcbf" text="10. When water is boiling, the temperature of the boiling water stays at 100°C, even though heat energy is continually transferred to the water. Why does the temperature stay the same?" />
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                    <OTChoice id="f908f63c-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
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                        <OTText id="f9091d4d-a780-11de-9e91-d3e5b9c2fcbf" text="Water cannot get any hotter than 100°C. That is its maximum temperature." />
                        <OTText id="f9091d4e-a780-11de-9e91-d3e5b9c2fcbf" text="The heat energy is being used to break up the water molecules into hydrogen and oxygen molecules." />
                        <OTText id="f9091d4f-a780-11de-9e91-d3e5b9c2fcbf" text="The heat energy is being used to overcome the attractions between molecules." />
                        <OTText id="f9091d50-a780-11de-9e91-d3e5b9c2fcbf" text="The heat energy is being used to destroy some of the hydrogen and oxygen atoms that make up the water molecules." />
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                <OTQuestion id="f9096b71-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_11">
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                    <OTText id="f9099282-a780-11de-9e91-d3e5b9c2fcbf" text="11. As water evaporates from your skin, it feels cooler there. This is because during evaporation" />
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                    <OTChoice id="f9099283-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
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                        <OTText id="f909b994-a780-11de-9e91-d3e5b9c2fcbf" text="the molecules with the highest energy evaporate first, lowering the temperature of the remaining water" />
                        <OTText id="f909b995-a780-11de-9e91-d3e5b9c2fcbf" text="water molecules condense in the air around the water, cooling the nearby skin molecules" />
                        <OTText id="f909b996-a780-11de-9e91-d3e5b9c2fcbf" text="cold energy is transmitted through collisions from the water molecules to the skin molecules" />
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                <OTQuestion id="f909e0a7-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_12">
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                    <OTText id="f909e0a8-a780-11de-9e91-d3e5b9c2fcbf" text="12. The pressure a gas exerts on the surface of an object is affected by which of the following factors?" />
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                        <OTText id="f90a07ba-a780-11de-9e91-d3e5b9c2fcbf" text="the mass of the individual molecules that are colliding against the object" />
                        <OTText id="f90a07bb-a780-11de-9e91-d3e5b9c2fcbf" text="the frequency of the molecular collisions against the object" />
                        <OTText id="f90a07bc-a780-11de-9e91-d3e5b9c2fcbf" text="the force with which each molecule collides against the object" />
                        <OTText id="f90a07bd-a780-11de-9e91-d3e5b9c2fcbf" text="both A and B" />
                        <OTText id="f90a07be-a780-11de-9e91-d3e5b9c2fcbf" text="both B and C" />
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                <OTQuestion id="f90af21f-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_13">
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                    <OTText id="f90af220-a780-11de-9e91-d3e5b9c2fcbf" text="13. A balloon filled with a gas will expand when heated. Why does this happen?" />
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                    <OTChoice id="f90af221-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
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                        <OTText id="f90b1932-a780-11de-9e91-d3e5b9c2fcbf" text="The number of atoms inside the balloon increases, so the atoms take up more space." />
                        <OTText id="f90b1933-a780-11de-9e91-d3e5b9c2fcbf" text="The atoms collide more forcefully, increasing the space between them." />
                        <OTText id="f90b1934-a780-11de-9e91-d3e5b9c2fcbf" text="The material between atoms expands, increasing the size of the balloon." />
                        <OTText id="f90b1935-a780-11de-9e91-d3e5b9c2fcbf" text="The forces between atoms weaken, allowing the atoms to separate from each other." />
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                <OTQuestion id="f90b4046-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_14">
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                    <OTText id="f90b4047-a780-11de-9e91-d3e5b9c2fcbf" text="14. A container is filled with a gas. How can the gas pressure be increased if the volume of the container remains the same?" />
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                    <OTChoice id="f90b4048-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="f90b4049-a780-11de-9e91-d3e5b9c2fcbf" text="by either increasing the number of molecules or increasing the temperature" />
                        <OTText id="f90b404a-a780-11de-9e91-d3e5b9c2fcbf" text="by either increasing the number of molecules or decreasing the temperature" />
                        <OTText id="f90b404b-a780-11de-9e91-d3e5b9c2fcbf" text="by either decreasing the number of molecules or increasing the temperature" />
                        <OTText id="f90b675c-a780-11de-9e91-d3e5b9c2fcbf" text="by either decreasing the number of molecules or decreasing the temperature" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="f90b4049-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fbacc62d-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_15">
                  <prompt>
                    <OTText id="fbacc62e-a780-11de-9e91-d3e5b9c2fcbf" text="15. If the volume of a gas increases while its temperature and number of molecules remain constant, what happens to the pressure?" />
                  </prompt>
                  <input>
                    <OTChoice id="fbacc62f-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fbacc630-a780-11de-9e91-d3e5b9c2fcbf" text="The pressure increases." />
                        <OTText id="fbaced41-a780-11de-9e91-d3e5b9c2fcbf" text="The pressure decreases." />
                        <OTText id="fbaced42-a780-11de-9e91-d3e5b9c2fcbf" text="The pressure stays the same." />
                        <OTText id="fbaced43-a780-11de-9e91-d3e5b9c2fcbf" text="It depends on the type of gas." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fbaced41-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fbad1454-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_16">
                  <prompt>
                    <OTText id="fbad1455-a780-11de-9e91-d3e5b9c2fcbf" text="16. A balloon is inside a very warm house. A student brings the balloon outside into the cold winter air. What should happen to the size of the balloon?" />
                  </prompt>
                  <input>
                    <OTChoice id="fbad1456-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fbad3b67-a780-11de-9e91-d3e5b9c2fcbf" text="The balloon will get larger." />
                        <OTText id="fbad3b68-a780-11de-9e91-d3e5b9c2fcbf" text="The balloon will get smaller." />
                        <OTText id="fbad3b69-a780-11de-9e91-d3e5b9c2fcbf" text="The balloon will stay the same size." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fbad3b68-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fbad627a-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_17">
                  <prompt>
                    <OTText id="fbad627b-a780-11de-9e91-d3e5b9c2fcbf" text="17. As you pump up a basketball, the pressure inside increases because there are more molecular collisions. This is PRIMARILY because pumping up the ball" />
                  </prompt>
                  <input>
                    <OTChoice id="fbad627c-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fbad898d-a780-11de-9e91-d3e5b9c2fcbf" text="adds energy, so the molecules move around much more quickly" />
                        <OTText id="fbad898e-a780-11de-9e91-d3e5b9c2fcbf" text="adds more air molecules" />
                        <OTText id="fbad898f-a780-11de-9e91-d3e5b9c2fcbf" text="increases the friction between the added air molecules and those originally inside the ball" />
                        <OTText id="fbad8990-a780-11de-9e91-d3e5b9c2fcbf" text="causes the ball to get significantly larger" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fbad898e-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fbadb0a1-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_18">
                  <prompt>
                    <OTText id="fbadb0a2-a780-11de-9e91-d3e5b9c2fcbf" text="18. If a boy expands his lungs while holding his breath, the air pressure in his lungs will decrease. Why? (Assume the temperature of the air in his lungs remains constant.)" />
                  </prompt>
                  <input>
                    <OTChoice id="fbadd7b3-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fbadd7b4-a780-11de-9e91-d3e5b9c2fcbf" text="Expanding his lungs slows down the air molecules, causing fewer collisions between them." />
                        <OTText id="fbadd7b5-a780-11de-9e91-d3e5b9c2fcbf" text="Expanding his lungs allows more air molecules to be dissolved into the blood, causing fewer collisions between them." />
                        <OTText id="fbadd7b6-a780-11de-9e91-d3e5b9c2fcbf" text="Expanding his lungs gives the air molecules more space, causing fewer collisions between them." />
                        <OTText id="fbadd7b7-a780-11de-9e91-d3e5b9c2fcbf" text="Expanding his lungs adds energy to the air molecules, causing more collisions between them." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fbadd7b6-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fbae25d8-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_19">
                  <prompt>
                    <OTText id="fbae25d9-a780-11de-9e91-d3e5b9c2fcbf" text="19. One balloon is twice the volume of another. If both balloons are at the same pressure and temperature, the larger balloon holds" />
                  </prompt>
                  <input>
                    <OTChoice id="fbae25da-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fbae25db-a780-11de-9e91-d3e5b9c2fcbf" text="the same number of molecules as the smaller one" />
                        <OTText id="fbae4cec-a780-11de-9e91-d3e5b9c2fcbf" text="twice the number of molecules as the smaller one" />
                        <OTText id="fbae73fd-a780-11de-9e91-d3e5b9c2fcbf" text="half the number of molecules as the smaller one" />
                        <OTText id="fbae73fe-a780-11de-9e91-d3e5b9c2fcbf" text="four times the number of molecules as the smaller one" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fbae4cec-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fbae9b0f-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_20">
                  <prompt>
                    <OTText id="fbae9b10-a780-11de-9e91-d3e5b9c2fcbf" text="20. Most spray cans have a warning that says to keep away from extreme heat because of risk of explosion. Why would heating a sealed can cause it to explode?" />
                  </prompt>
                  <input>
                    <OTChoice id="fbae9b11-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fbae9b12-a780-11de-9e91-d3e5b9c2fcbf" text="Heating expands the metal of the can, which weakens the seals and allows the already high-pressure gas to escape." />
                        <OTText id="fbaec223-a780-11de-9e91-d3e5b9c2fcbf" text="Heating causes a chemical reaction, which creates more gas molecules." />
                        <OTText id="fbaec224-a780-11de-9e91-d3e5b9c2fcbf" text="Heating compresses the gases inside the can, which increases the pressure." />
                        <OTText id="fbaec225-a780-11de-9e91-d3e5b9c2fcbf" text="Heating increases the force and frequency of molecules colliding with the container." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fbaec225-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fbaf1046-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_21">
                  <prompt>
                    <OTText id="fbaf1047-a780-11de-9e91-d3e5b9c2fcbf" text="21. A student places one end of a paper towel in a bowl of water. Why does the paper towel soak up some of the water?" />
                  </prompt>
                  <input>
                    <OTChoice id="fbaf1048-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fbaf1049-a780-11de-9e91-d3e5b9c2fcbf" text="Water molecules chemically react with molecules of the paper towel." />
                        <OTText id="fbaf104a-a780-11de-9e91-d3e5b9c2fcbf" text="Water molecules are attracted to molecules of the paper towel." />
                        <OTText id="fbaf104b-a780-11de-9e91-d3e5b9c2fcbf" text="Water molecules repel each other and use the paper towel as a way to spread out more." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fbaf104a-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fbaf375c-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_22">
                  <prompt>
                    <OTText id="fbaf375d-a780-11de-9e91-d3e5b9c2fcbf" text="22. One substance is made from polar molecules, and another substance is made from non-polar molecules that are similar in size and shape to the polar ones. Which substance has the higher boiling point?" />
                  </prompt>
                  <input>
                    <OTChoice id="fbaf375e-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fbaf5e6f-a780-11de-9e91-d3e5b9c2fcbf" text="the substance made from polar molecules" />
                        <OTText id="fbaf5e70-a780-11de-9e91-d3e5b9c2fcbf" text="the substance made from non-polar molecules" />
                        <OTText id="fbaf5e71-a780-11de-9e91-d3e5b9c2fcbf" text="Both have the same boiling point." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fbaf5e6f-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fbaf8582-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_23">
                  <prompt>
                    <OTText id="fbaf8583-a780-11de-9e91-d3e5b9c2fcbf" text="23. What is the reason for your answer above?" />
                  </prompt>
                  <input>
                    <OTChoice id="fbaf8584-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fbaf8585-a780-11de-9e91-d3e5b9c2fcbf" text="Polar molecules form covalent bonds that are much stronger than non-polar bonds." />
                        <OTText id="fbaf8586-a780-11de-9e91-d3e5b9c2fcbf" text="Non-polar molecules attract to all other kinds of molecules." />
                        <OTText id="fbaf8587-a780-11de-9e91-d3e5b9c2fcbf" text="Molecules of similar size and shape attract to each other equally." />
                        <OTText id="fbaf8588-a780-11de-9e91-d3e5b9c2fcbf" text="The intermolecular attractions of polar molecules are stronger than those of non-polar molecules." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fbaf8588-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fe036099-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_24">
                  <prompt>
                    <OTText id="fe03609a-a780-11de-9e91-d3e5b9c2fcbf" text="24. A solid made of molecules that fit closely together will melt at" />
                  </prompt>
                  <input>
                    <OTChoice id="fe03609b-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fe03609c-a780-11de-9e91-d3e5b9c2fcbf" text="a lower temperature than loosely packed molecules" />
                        <OTText id="fe0387ad-a780-11de-9e91-d3e5b9c2fcbf" text="a higher temperature than loosely packed molecules" />
                        <OTText id="fe0387ae-a780-11de-9e91-d3e5b9c2fcbf" text="the same temperature as loosely packed molecules" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fe0387ad-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fe03aebf-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_25">
                  <prompt>
                    <OTText id="fe03aec0-a780-11de-9e91-d3e5b9c2fcbf" text="25. Oil and water DO NOT mix. Why?" />
                  </prompt>
                  <input>
                    <OTChoice id="fe03aec1-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fe03aec2-a780-11de-9e91-d3e5b9c2fcbf" text="Oil molecules repel water molecules." />
                        <OTText id="fe03d4d3-a780-11de-9e91-d3e5b9c2fcbf" text="Water molecules repel oil molecules." />
                        <OTText id="fe03d4d4-a780-11de-9e91-d3e5b9c2fcbf" text="Water molecules attract to other water molecules more strongly than to oil molecules." />
                        <OTText id="fe03d4d5-a780-11de-9e91-d3e5b9c2fcbf" text="Water molecules are non-polar, so they don't attract to oil molecules very well." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fe03d4d4-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fe03fbe6-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_26">
                  <prompt>
                    <OTText id="fe03fbe7-a780-11de-9e91-d3e5b9c2fcbf" text="26. What happens when salt dissolves in water?" />
                  </prompt>
                  <input>
                    <OTChoice id="fe03fbe8-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fe03fbe9-a780-11de-9e91-d3e5b9c2fcbf" text="The salt ions attract to and are surrounded by water molecules." />
                        <OTText id="fe0422fa-a780-11de-9e91-d3e5b9c2fcbf" text="The salt reacts with the water to form a new substance." />
                        <OTText id="fe0422fb-a780-11de-9e91-d3e5b9c2fcbf" text="The salt molecules change into water molecules." />
                        <OTText id="fe0422fc-a780-11de-9e91-d3e5b9c2fcbf" text="The salt ions are destroyed when they come in contact with water." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fe03fbe9-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fe05346d-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_27">
                  <prompt>
                    <OTText id="fe05346e-a780-11de-9e91-d3e5b9c2fcbf" text="27. Sugar dissolves faster in hot water than in cold water. This is because the warmer temperature speeds up the rate at which sugar molecules" />
                  </prompt>
                  <input>
                    <OTChoice id="fe05346f-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fe053470-a780-11de-9e91-d3e5b9c2fcbf" text="form attractions to water molecules" />
                        <OTText id="fe055b81-a780-11de-9e91-d3e5b9c2fcbf" text="change into water molecules" />
                        <OTText id="fe055b82-a780-11de-9e91-d3e5b9c2fcbf" text="chemically react with water molecules" />
                        <OTText id="fe055b83-a780-11de-9e91-d3e5b9c2fcbf" text="are destroyed" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fe053470-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fe058294-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_28">
                  <prompt>
                    <OTText id="fe058295-a780-11de-9e91-d3e5b9c2fcbf" text="28. Table salt (NaCl) dissolves easily in water, but silver chloride (AgCl) does not. Why?" />
                  </prompt>
                  <input>
                    <OTChoice id="fe058296-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fe058297-a780-11de-9e91-d3e5b9c2fcbf" text="Ag and Cl ions attract better to themselves than to water molecules." />
                        <OTText id="fe058298-a780-11de-9e91-d3e5b9c2fcbf" text="NaCl has a lower melting point than AgCl." />
                        <OTText id="fe058299-a780-11de-9e91-d3e5b9c2fcbf" text="NaCl chemically reacts with water to form a new substance." />
                        <OTText id="fe05a9aa-a780-11de-9e91-d3e5b9c2fcbf" text="Ag and Cl ions are repelled by water molecules." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fe058297-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fe05a9ab-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_29">
                  <prompt>
                    <OTText id="fe05d0bc-a780-11de-9e91-d3e5b9c2fcbf" text="29. Which of the following subatomic particles repel each other but are attracted to a nucleus?" />
                  </prompt>
                  <input>
                    <OTChoice id="fe05d0bd-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fe05d0be-a780-11de-9e91-d3e5b9c2fcbf" text="protons" />
                        <OTText id="fe05d0bf-a780-11de-9e91-d3e5b9c2fcbf" text="neutrons" />
                        <OTText id="fe05d0c0-a780-11de-9e91-d3e5b9c2fcbf" text="electrons" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fe05d0c0-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fe05f7d1-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_30">
                  <prompt>
                    <OTText id="fe05f7d2-a780-11de-9e91-d3e5b9c2fcbf" text="30. The central atom of a molecule has two areas of electron density surrounding it. What is the geometry around this central atom?" />
                  </prompt>
                  <input>
                    <OTChoice id="fe05f7d3-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fe05f7d4-a780-11de-9e91-d3e5b9c2fcbf" text="a straight line" />
                        <OTText id="fe061ee5-a780-11de-9e91-d3e5b9c2fcbf" text="a bent line" />
                        <OTText id="fe061ee6-a780-11de-9e91-d3e5b9c2fcbf" text="a flat, triangular geometry" />
                        <OTText id="fe061ee7-a780-11de-9e91-d3e5b9c2fcbf" text="a four-corner pyramid geometry" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fe05f7d4-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="fe0645f8-a780-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_31">
                  <prompt>
                    <OTText id="fe0645f9-a780-11de-9e91-d3e5b9c2fcbf" text="31. The central atom of a molecule has three areas of electron density surrounding it and is bonded to three other atoms. What is the geometry around this central atom?" />
                  </prompt>
                  <input>
                    <OTChoice id="fe0645fa-a780-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="fe066d0b-a780-11de-9e91-d3e5b9c2fcbf" text="a straight line" />
                        <OTText id="fe066d0c-a780-11de-9e91-d3e5b9c2fcbf" text="a bent line" />
                        <OTText id="fe066d0d-a780-11de-9e91-d3e5b9c2fcbf" text="a flat, triangular geometry" />
                        <OTText id="fe066d0e-a780-11de-9e91-d3e5b9c2fcbf" text="a four-corner pyramid geometry" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="fe066d0d-a780-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="003c11bf-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_32">
                  <prompt>
                    <OTText id="003c11c0-a781-11de-9e91-d3e5b9c2fcbf" text="32. Why does methane (CH4) form a tetrahedral shape rather than remaining a flat molecule, as shown in the Lewis dot diagram above?" />
                  </prompt>
                  <input>
                    <OTChoice id="003c38d1-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="003c38d2-a781-11de-9e91-d3e5b9c2fcbf" text="All of the hydrogen atoms attract to each other, causing the tetrahedral shape to occur." />
                        <OTText id="003c38d3-a781-11de-9e91-d3e5b9c2fcbf" text="The carbon atom pulls equally on all of the electrons in the C-H bonds." />
                        <OTText id="003c38d4-a781-11de-9e91-d3e5b9c2fcbf" text="The electron pairs shared in the C-H bonds repel each other, forming a tetrahedral molecule." />
                        <OTText id="003c38d5-a781-11de-9e91-d3e5b9c2fcbf" text="Molecules can’t be flat. They all have three-dimensional shapes." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="003c38d4-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="003cae06-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_33">
                  <prompt>
                    <OTText id="003cae07-a781-11de-9e91-d3e5b9c2fcbf" text="33. Above is the Lewis dot diagram for COCl2. What is the most likely shape for this molecule?" />
                  </prompt>
                  <input>
                    <OTChoice id="003cae08-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="003cae09-a781-11de-9e91-d3e5b9c2fcbf" text="linear" />
                        <OTText id="003cae0a-a781-11de-9e91-d3e5b9c2fcbf" text="bent" />
                        <OTText id="003cae0b-a781-11de-9e91-d3e5b9c2fcbf" text="tetrahedral (four-corner pyramid shape)" />
                        <OTText id="003cae0c-a781-11de-9e91-d3e5b9c2fcbf" text="trigonal planar (flat but shaped like a triangle)" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="003cae0c-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="003cfc2d-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_34">
                  <prompt>
                    <OTText id="003cfc2e-a781-11de-9e91-d3e5b9c2fcbf" text="34. The Lewis dot diagram shown above has an unshared pair of electrons. This unshared pair of electrons" />
                  </prompt>
                  <input>
                    <OTChoice id="003cfc2f-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="003cfc30-a781-11de-9e91-d3e5b9c2fcbf" text="causes the molecule to lie flat in a plane" />
                        <OTText id="003cfc31-a781-11de-9e91-d3e5b9c2fcbf" text="causes the molecule to form a trigonal pyramidal shape" />
                        <OTText id="003cfc32-a781-11de-9e91-d3e5b9c2fcbf" text="causes the molecule to be bent" />
                        <OTText id="003d2343-a781-11de-9e91-d3e5b9c2fcbf" text="has no effect on the shape of the molecule" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="003cfc31-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="003d2344-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_35">
                  <prompt>
                    <OTText id="003d4a55-a781-11de-9e91-d3e5b9c2fcbf" text="35. Three regions of electron density surround" />
                  </prompt>
                  <input>
                    <OTChoice id="003d4a56-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="003d4a57-a781-11de-9e91-d3e5b9c2fcbf" text="Atom A" />
                        <OTText id="003d4a58-a781-11de-9e91-d3e5b9c2fcbf" text="Atom B" />
                        <OTText id="003d4a59-a781-11de-9e91-d3e5b9c2fcbf" text="Atom C" />
                        <OTText id="003d4a5a-a781-11de-9e91-d3e5b9c2fcbf" text="Atoms A and B" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="003d4a59-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="003d987b-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_36">
                  <prompt>
                    <OTText id="003d987c-a781-11de-9e91-d3e5b9c2fcbf" text="36. Four regions of electron density surround" />
                  </prompt>
                  <input>
                    <OTChoice id="003d987d-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="003d987e-a781-11de-9e91-d3e5b9c2fcbf" text="Atom A" />
                        <OTText id="003d987f-a781-11de-9e91-d3e5b9c2fcbf" text="Atom B" />
                        <OTText id="003d9880-a781-11de-9e91-d3e5b9c2fcbf" text="Atom C" />
                        <OTText id="003d9881-a781-11de-9e91-d3e5b9c2fcbf" text="Atoms A and B" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="003d9881-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="003dbf92-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_37">
                  <prompt>
                    <OTText id="003dbf93-a781-11de-9e91-d3e5b9c2fcbf" text="37. Atoms form a covalent bond by" />
                  </prompt>
                  <input>
                    <OTChoice id="003dbf94-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="003dbf95-a781-11de-9e91-d3e5b9c2fcbf" text="sharing protons" />
                        <OTText id="003de6a6-a781-11de-9e91-d3e5b9c2fcbf" text="sharing neutrons" />
                        <OTText id="003de6a7-a781-11de-9e91-d3e5b9c2fcbf" text="sharing electrons" />
                        <OTText id="003de6a8-a781-11de-9e91-d3e5b9c2fcbf" text="getting close enough that their nuclei touch" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="003de6a7-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="003e5bd9-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_38">
                  <prompt>
                    <OTText id="003e5bda-a781-11de-9e91-d3e5b9c2fcbf" text="38. A polar molecule MUST have" />
                  </prompt>
                  <input>
                    <OTChoice id="003e5bdb-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="003e82ec-a781-11de-9e91-d3e5b9c2fcbf" text="an overall positive charge" />
                        <OTText id="003e82ed-a781-11de-9e91-d3e5b9c2fcbf" text="an overall negative charge" />
                        <OTText id="003f463e-a781-11de-9e91-d3e5b9c2fcbf" text="no overall charge" />
                        <OTText id="003f463f-a781-11de-9e91-d3e5b9c2fcbf" text="a part that has a positive charge and a part that has a negative charge" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="003f463f-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="02add540-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_39">
                  <prompt>
                    <OTText id="02adfc51-a781-11de-9e91-d3e5b9c2fcbf" text="39. A bond formed between two atoms with a moderate difference in electronegativity is" />
                  </prompt>
                  <input>
                    <OTChoice id="02adfc52-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="02adfc53-a781-11de-9e91-d3e5b9c2fcbf" text="ionic" />
                        <OTText id="02ae2364-a781-11de-9e91-d3e5b9c2fcbf" text="polar covalent" />
                        <OTText id="02ae2365-a781-11de-9e91-d3e5b9c2fcbf" text="non-polar covalent" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="02ae2364-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="02ae4a76-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_40">
                  <prompt>
                    <OTText id="02ae4a77-a781-11de-9e91-d3e5b9c2fcbf" text="40. What is the reason for your answer above?" />
                  </prompt>
                  <input>
                    <OTChoice id="02ae4a78-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="02ae7189-a781-11de-9e91-d3e5b9c2fcbf" text="Electronegativity is a measure of the charge of an atom." />
                        <OTText id="02ae718a-a781-11de-9e91-d3e5b9c2fcbf" text="Electronegativity is a measure of how well an atom holds on to its own electrons." />
                        <OTText id="02ae718b-a781-11de-9e91-d3e5b9c2fcbf" text="Electronegativity is a measure of how well an atom can attract electrons from other atoms." />
                        <OTText id="02ae718c-a781-11de-9e91-d3e5b9c2fcbf" text="Electronegativity is a measure of the size of an atom." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="02ae718b-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="02ae989d-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_41">
                  <prompt>
                    <OTText id="02ae989e-a781-11de-9e91-d3e5b9c2fcbf" text="41. A bond formed between two atoms that both have high electronegativity is" />
                  </prompt>
                  <input>
                    <OTChoice id="02ae989f-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="02aebfb0-a781-11de-9e91-d3e5b9c2fcbf" text="ionic" />
                        <OTText id="02aebfb1-a781-11de-9e91-d3e5b9c2fcbf" text="polar covalent" />
                        <OTText id="02aebfb2-a781-11de-9e91-d3e5b9c2fcbf" text="non-polar covalent" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="02aebfb2-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="02aee6c3-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_42">
                  <prompt>
                    <OTText id="02af0dd4-a781-11de-9e91-d3e5b9c2fcbf" text="42. A molecule that is polar must contain" />
                  </prompt>
                  <input>
                    <OTChoice id="02af0dd5-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="02af0dd6-a781-11de-9e91-d3e5b9c2fcbf" text="all polar covalent bonds" />
                        <OTText id="02af0dd7-a781-11de-9e91-d3e5b9c2fcbf" text="mostly non-polar bonds and one polar bond" />
                        <OTText id="02af34e8-a781-11de-9e91-d3e5b9c2fcbf" text="one or more non-polar bonds" />
                        <OTText id="02af34e9-a781-11de-9e91-d3e5b9c2fcbf" text="one or more polar bonds" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="02af34e9-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="02af5bfa-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_43">
                  <prompt>
                    <OTText id="02af5bfb-a781-11de-9e91-d3e5b9c2fcbf" text="43. In a non-polar covalent bond, both atoms have an identical or very similar charge. Why?" />
                  </prompt>
                  <input>
                    <OTChoice id="02af5bfc-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="02af5bfd-a781-11de-9e91-d3e5b9c2fcbf" text="Electrons are shared evenly in non-polar covalent bonds." />
                        <OTText id="02af830e-a781-11de-9e91-d3e5b9c2fcbf" text="The charge is determined by the distance between the atoms." />
                        <OTText id="02af830f-a781-11de-9e91-d3e5b9c2fcbf" text="Non-polar atoms are made from neutrons, which have no charge." />
                        <OTText id="02af8310-a781-11de-9e91-d3e5b9c2fcbf" text="The polarity of each atom is canceled out, which makes the bond non-polar." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="02af5bfd-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="02afaa21-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_44">
                  <prompt>
                    <OTText id="02afaa22-a781-11de-9e91-d3e5b9c2fcbf" text="44. Melting water is NOT a chemical reaction. Why?" />
                  </prompt>
                  <input>
                    <OTChoice id="02afaa23-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="02afaa24-a781-11de-9e91-d3e5b9c2fcbf" text="The temperature is not high enough." />
                        <OTText id="02afaa25-a781-11de-9e91-d3e5b9c2fcbf" text="No chemical bonds are broken." />
                        <OTText id="02afd136-a781-11de-9e91-d3e5b9c2fcbf" text="No chemical bonds are formed." />
                        <OTText id="02afd137-a781-11de-9e91-d3e5b9c2fcbf" text="Both B and C" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="02afd137-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="02aff848-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_45">
                  <prompt>
                    <OTText id="02aff849-a781-11de-9e91-d3e5b9c2fcbf" text="45. If the temperature of a chemical reaction is increased, the speed of the reaction is typically" />
                  </prompt>
                  <input>
                    <OTChoice id="02aff84a-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="02aff84b-a781-11de-9e91-d3e5b9c2fcbf" text="increased" />
                        <OTText id="02b01f5c-a781-11de-9e91-d3e5b9c2fcbf" text="decreased" />
                        <OTText id="02b01f5d-a781-11de-9e91-d3e5b9c2fcbf" text="not affected" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="02aff84b-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="02b0466e-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_46">
                  <prompt>
                    <OTText id="02b0466f-a781-11de-9e91-d3e5b9c2fcbf" text="46. What is the reason for your answer above?" />
                  </prompt>
                  <input>
                    <OTChoice id="02b04670-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="02b04671-a781-11de-9e91-d3e5b9c2fcbf" text="Reactants at a higher temperature interact less often than reactants at a cooler temperature." />
                        <OTText id="02b04672-a781-11de-9e91-d3e5b9c2fcbf" text="Reactants at a higher temperature collide more often than reactants at a cooler temperature." />
                        <OTText id="02b157e3-a781-11de-9e91-d3e5b9c2fcbf" text="Reactants at a higher temperature stick together better than reactants at a cooler temperature." />
                        <OTText id="02b157e4-a781-11de-9e91-d3e5b9c2fcbf" text="The speed of a reaction cannot be changed." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="02b04672-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="04a93045-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_47">
                  <prompt>
                    <OTText id="04a95756-a781-11de-9e91-d3e5b9c2fcbf" text="47. A concentrated acid is more reactive, and therefore more dangerous, than a dilute acid. This is because the molecules of a concentrated acid" />
                  </prompt>
                  <input>
                    <OTChoice id="04a95757-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="04a95758-a781-11de-9e91-d3e5b9c2fcbf" text="form a different substance than they do in a dilute acid" />
                        <OTText id="04a95759-a781-11de-9e91-d3e5b9c2fcbf" text="have more collisions with whatever they are reacting with than the molecules of a dilute acid" />
                        <OTText id="04a9575a-a781-11de-9e91-d3e5b9c2fcbf" text="form stronger bonds with whatever they are reacting with than the molecules of the dilute acid" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="04a95759-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="04a97e6b-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_48">
                  <prompt>
                    <OTText id="04a97e6c-a781-11de-9e91-d3e5b9c2fcbf" text="48. Which of the following must be the same for both the reactants and products of a chemical reaction?" />
                  </prompt>
                  <input>
                    <OTChoice id="04a9a57d-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="04a9a57e-a781-11de-9e91-d3e5b9c2fcbf" text="the total mass" />
                        <OTText id="04a9a57f-a781-11de-9e91-d3e5b9c2fcbf" text="the total number of molecules" />
                        <OTText id="04a9a580-a781-11de-9e91-d3e5b9c2fcbf" text="the total number of atoms of each element" />
                        <OTText id="04a9a581-a781-11de-9e91-d3e5b9c2fcbf" text="both A and B" />
                        <OTText id="04a9cc92-a781-11de-9e91-d3e5b9c2fcbf" text="both A and C" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="04a9cc92-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="04a9f3a3-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_49">
                  <prompt>
                    <OTText id="04aa1ab4-a781-11de-9e91-d3e5b9c2fcbf">
                      <text>     CH4 + O2 → CO2 + 2 H2O
49. What is one reason the above equation is NOT balanced correctly?</text>
                    </OTText>
                  </prompt>
                  <input>
                    <OTChoice id="04aa1ab5-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="04aa1ab6-a781-11de-9e91-d3e5b9c2fcbf" text="The reaction starts with fewer carbon atoms than it ends with." />
                        <OTText id="04aa1ab7-a781-11de-9e91-d3e5b9c2fcbf" text="The reaction starts with fewer hydrogen atoms than it ends with." />
                        <OTText id="04aa1ab8-a781-11de-9e91-d3e5b9c2fcbf" text="The reaction starts with fewer oxygen atoms than it ends with." />
                        <OTText id="04aa1ab9-a781-11de-9e91-d3e5b9c2fcbf" text="All of the above." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="04aa1ab8-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="04ab7a4a-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_50">
                  <prompt>
                    <OTText id="04aba15b-a781-11de-9e91-d3e5b9c2fcbf">
                      <text>50. The following diagram represents a mixture of S atoms and O2 molecules in a closed container: 
Which diagram below shows the results after the mixture reacts as completely as possible according to the equation?</text>
                    </OTText>
                  </prompt>
                  <input>
                    <OTChoice id="04aba15c-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="04aba15d-a781-11de-9e91-d3e5b9c2fcbf" text="Diagram a" />
                        <OTText id="04aba15e-a781-11de-9e91-d3e5b9c2fcbf" text="Diagram b" />
                        <OTText id="04abc86f-a781-11de-9e91-d3e5b9c2fcbf" text="Diagram c" />
                        <OTText id="04abef80-a781-11de-9e91-d3e5b9c2fcbf" text="Diagram d" />
                        <OTText id="04abef81-a781-11de-9e91-d3e5b9c2fcbf" text="Diagram e" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="04abef80-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="04ac1692-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_51">
                  <prompt>
                    <OTText id="04ac1693-a781-11de-9e91-d3e5b9c2fcbf" text="51. What is the limiting reactant in the reaction shown in Question 50?" />
                  </prompt>
                  <input>
                    <OTChoice id="04ac1694-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="04ac1695-a781-11de-9e91-d3e5b9c2fcbf" text="sulfur (S)" />
                        <OTText id="04ac1696-a781-11de-9e91-d3e5b9c2fcbf" text="oxygen (O2)" />
                        <OTText id="04ac1697-a781-11de-9e91-d3e5b9c2fcbf" text="sulfur trioxide (SO3)" />
                        <OTText id="04ac3da8-a781-11de-9e91-d3e5b9c2fcbf" text="both sulfur and oxygen" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="04ac1696-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="04ac3da9-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_52">
                  <prompt>
                    <OTText id="04ac3daa-a781-11de-9e91-d3e5b9c2fcbf" text="52. What kind of reaction is shown above?" />
                  </prompt>
                  <input>
                    <OTChoice id="04ac3dab-a781-11de-9e91-d3e5b9c2fcbf" selectionUI="0">
                      <choices>
                        <OTText id="04ac64bc-a781-11de-9e91-d3e5b9c2fcbf" text="synthesis" />
                        <OTText id="04ac64bd-a781-11de-9e91-d3e5b9c2fcbf" text="decomposition" />
                        <OTText id="04ac64be-a781-11de-9e91-d3e5b9c2fcbf" text="single replacement" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="04ac64bc-a781-11de-9e91-d3e5b9c2fcbf" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="04ac8bcf-a781-11de-9e91-d3e5b9c2fcbf" name="ChemMCI_53">
                  <prompt>
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