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                    <OTText id="85e42e50-fb2c-11de-a561-214d0adaa7b2" text="Please check ALL classes in which you have previously done SAM or RI-ITEST activities." />
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                        <OTText id="85e7fee2-fb2c-11de-a561-214d0adaa7b2" text="Physics" />
                        <OTText id="85e825f3-fb2c-11de-a561-214d0adaa7b2" text="Chemistry" />
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                <OTQuestion id="85e8e948-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_Other">
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                    <OTText id="85e8e949-fb2c-11de-a561-214d0adaa7b2" text="If you checked &quot;Other&quot; in the previous question, please type the name of the courses in which you previously have done SAM or RI-ITEST activities. Otherwise, skip this question." />
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                    <OTText id="85e9105d-fb2c-11de-a561-214d0adaa7b2" text="1. What are computer models used for?" />
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                        <OTText id="85e9376f-fb2c-11de-a561-214d0adaa7b2" text="making predictions" />
                        <OTText id="85e93770-fb2c-11de-a561-214d0adaa7b2" text="testing theories" />
                        <OTText id="85e93771-fb2c-11de-a561-214d0adaa7b2" text="designing things" />
                        <OTText id="85e93772-fb2c-11de-a561-214d0adaa7b2" text="making predictions AND testing theories" />
                        <OTText id="85e93773-fb2c-11de-a561-214d0adaa7b2" text="all of the above" />
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                <OTQuestion id="85e98594-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_2">
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                    <OTText id="85e98595-fb2c-11de-a561-214d0adaa7b2" text="2. What is true of the best computer models?" />
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                    <OTChoice id="85e98596-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="85e98597-fb2c-11de-a561-214d0adaa7b2" text="They are a completely accurate reproduction of what they are modeling." />
                        <OTText id="85e9aca8-fb2c-11de-a561-214d0adaa7b2" 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="85e9aca9-fb2c-11de-a561-214d0adaa7b2" 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="85e9acaa-fb2c-11de-a561-214d0adaa7b2" 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="85e9facb-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_3">
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                    <OTText id="85e9facc-fb2c-11de-a561-214d0adaa7b2" text="3. In which case does it make sense to use a computer model?" />
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                    <OTChoice id="85e9facd-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="85e9face-fb2c-11de-a561-214d0adaa7b2" text="to conduct an experiment that would be too expensive to do in real life" />
                        <OTText id="85e9facf-fb2c-11de-a561-214d0adaa7b2" text="to conduct an experiment that would be too dangerous to do in real life" />
                        <OTText id="85ea21e0-fb2c-11de-a561-214d0adaa7b2" text="to conduct an experiment that would take too long to do in real life" />
                        <OTText id="85ea21e1-fb2c-11de-a561-214d0adaa7b2" text="all of the above" />
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                <OTQuestion id="85ea21e2-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_4">
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                    <OTText id="85ea48f3-fb2c-11de-a561-214d0adaa7b2" text="4. What is the most likely reason the results from a model may NOT perfectly match reality?" />
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                    <OTChoice id="85ea48f4-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="85ea48f5-fb2c-11de-a561-214d0adaa7b2" text="All the factors that might affect the model were not considered." />
                        <OTText id="85ea48f6-fb2c-11de-a561-214d0adaa7b2" text="The user set the controls or initial parameters so that the starting conditions for the model were unrealistic." />
                        <OTText id="85ea7007-fb2c-11de-a561-214d0adaa7b2" text="The user didn't interpret the results properly." />
                        <OTText id="85ea9718-fb2c-11de-a561-214d0adaa7b2" text="There was a problem with the computer processor." />
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                <OTQuestion id="85ea9719-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_5">
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                    <OTText id="85ea971a-fb2c-11de-a561-214d0adaa7b2" text="5. A liquid CANNOT be squeezed into a significantly smaller volume. This is because molecules in a liquid" />
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                        <OTText id="85ea971c-fb2c-11de-a561-214d0adaa7b2" text="move too fast to be compressed into a smaller volume" />
                        <OTText id="85eabe2d-fb2c-11de-a561-214d0adaa7b2" text="are bigger than gas molecules" />
                        <OTText id="85eabe2e-fb2c-11de-a561-214d0adaa7b2" text="have very little space between them" />
                        <OTText id="85eabe2f-fb2c-11de-a561-214d0adaa7b2" text="flow freely through their container" />
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                <OTQuestion id="85eae540-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_6">
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                    <OTText id="85eae541-fb2c-11de-a561-214d0adaa7b2" text="6. What happens as water boils?" />
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                    <OTChoice id="85eae542-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="85eae543-fb2c-11de-a561-214d0adaa7b2" text="The water molecules overcome their attractions for each other." />
                        <OTText id="85eae544-fb2c-11de-a561-214d0adaa7b2" text="The covalent bonds between the hydrogen and oxygen atoms that make up the water molecules are broken." />
                        <OTText id="85eb0c55-fb2c-11de-a561-214d0adaa7b2" text="The attractions between the water molecules are weakened." />
                        <OTText id="85eb0c56-fb2c-11de-a561-214d0adaa7b2" text="The hydrogen and oxygen atoms that make up the water molecules are destroyed." />
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                    <object refid="85eae543-fb2c-11de-a561-214d0adaa7b2" />
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                <OTQuestion id="88240c67-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_7">
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                    <OTText id="88243378-fb2c-11de-a561-214d0adaa7b2" text="7. Heating a solid eventually causes melting. This is because heating a solid" />
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                        <OTText id="8824337a-fb2c-11de-a561-214d0adaa7b2" text="gives the atoms more kinetic energy, so they can overcome some of their attractions" />
                        <OTText id="88245a8b-fb2c-11de-a561-214d0adaa7b2" text="loosens the material between the atoms, allowing them to move past each other" />
                        <OTText id="88245a8c-fb2c-11de-a561-214d0adaa7b2" text="creates a chemical reaction that turns the solid into a liquid" />
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                <OTQuestion id="8824819d-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_8">
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                    <OTText id="8824819e-fb2c-11de-a561-214d0adaa7b2" text="8. When nitrogen gas is cooled to a low enough temperature, it becomes a liquid. Why?" />
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                    <OTChoice id="8824819f-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="882481a0-fb2c-11de-a561-214d0adaa7b2" text="The energy of the nitrogen gas decreases, and the nitrogen molecules stop moving." />
                        <OTText id="882481a1-fb2c-11de-a561-214d0adaa7b2" text="The cold energy of the nitrogen gas increases, and the nitrogen molecules bind together." />
                        <OTText id="8824a8b2-fb2c-11de-a561-214d0adaa7b2" text="A chemical reaction happens, and the nitrogen gas changes into water." />
                        <OTText id="8824a8b3-fb2c-11de-a561-214d0adaa7b2" text="The nitrogen molecules move more slowly and don't have enough energy to overcome their attractive forces." />
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                <OTQuestion id="8824cfc4-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_10">
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                    <OTText id="8824cfc5-fb2c-11de-a561-214d0adaa7b2" 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="8824cfc6-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="8824cfc7-fb2c-11de-a561-214d0adaa7b2" text="have weaker attractions to each other" />
                        <OTText id="8824cfc8-fb2c-11de-a561-214d0adaa7b2" text="have stronger attractions to each other" />
                        <OTText id="8824f6d9-fb2c-11de-a561-214d0adaa7b2" text="are harder to break down into atoms" />
                        <OTText id="8824f6da-fb2c-11de-a561-214d0adaa7b2" text="do not absorb heat well" />
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                <OTQuestion id="88251deb-fb2c-11de-a561-214d0adaa7b2" name="http://ri-itest.concord.org/SAMActivities/MCI-chem/ChemMCI_v2_post/page2.cml">
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                    <OTText id="88251dec-fb2c-11de-a561-214d0adaa7b2" 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="88251ded-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="882544fe-fb2c-11de-a561-214d0adaa7b2" text="Water cannot get any hotter than 100°C. That is its maximum temperature." />
                        <OTText id="882544ff-fb2c-11de-a561-214d0adaa7b2" text="The heat energy is being used to break up the water molecules into hydrogen and oxygen molecules." />
                        <OTText id="88254500-fb2c-11de-a561-214d0adaa7b2" text="The heat energy is being used to overcome the attractions between molecules." />
                        <OTText id="88254501-fb2c-11de-a561-214d0adaa7b2" 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="88256c12-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_11">
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                    <OTText id="8825ba33-fb2c-11de-a561-214d0adaa7b2" text="11. As water evaporates from your skin, it feels cooler there. This is because during evaporation" />
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                    <OTChoice id="8825ba34-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="8825e145-fb2c-11de-a561-214d0adaa7b2" text="the molecules with the highest energy evaporate first, lowering the temperature of the remaining water" />
                        <OTText id="8825e146-fb2c-11de-a561-214d0adaa7b2" text="water molecules condense in the air around the water, cooling the nearby skin molecules" />
                        <OTText id="8825e147-fb2c-11de-a561-214d0adaa7b2" text="cold energy is transmitted through collisions from the water molecules to the skin molecules" />
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                <OTQuestion id="88260858-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_12">
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                    <OTText id="88260859-fb2c-11de-a561-214d0adaa7b2" 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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                    <OTChoice id="88262f6a-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="88262f6b-fb2c-11de-a561-214d0adaa7b2" text="the mass of the individual molecules that are colliding against the object" />
                        <OTText id="88262f6c-fb2c-11de-a561-214d0adaa7b2" text="the frequency of the molecular collisions against the object" />
                        <OTText id="88262f6d-fb2c-11de-a561-214d0adaa7b2" text="the force with which each molecule collides against the object" />
                        <OTText id="88262f6e-fb2c-11de-a561-214d0adaa7b2" text="both A and B" />
                        <OTText id="8826567f-fb2c-11de-a561-214d0adaa7b2" text="both B and C" />
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                <OTQuestion id="88273fe0-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_13">
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                    <OTText id="882766f1-fb2c-11de-a561-214d0adaa7b2" text="13. A balloon filled with a gas will expand when heated. Why does this happen?" />
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                    <OTChoice id="882766f2-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="882766f3-fb2c-11de-a561-214d0adaa7b2" text="The number of atoms inside the balloon increases, so the atoms take up more space." />
                        <OTText id="8827b514-fb2c-11de-a561-214d0adaa7b2" text="The atoms collide more forcefully, increasing the space between them." />
                        <OTText id="8827b515-fb2c-11de-a561-214d0adaa7b2" text="The material between atoms expands, increasing the size of the balloon." />
                        <OTText id="8827dc26-fb2c-11de-a561-214d0adaa7b2" text="The forces between atoms weaken, allowing the atoms to separate from each other." />
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                <OTQuestion id="88280337-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_14">
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                    <OTText id="88280338-fb2c-11de-a561-214d0adaa7b2" 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="88280339-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="8828033a-fb2c-11de-a561-214d0adaa7b2" text="by either increasing the number of molecules or increasing the temperature" />
                        <OTText id="8828033b-fb2c-11de-a561-214d0adaa7b2" text="by either increasing the number of molecules or decreasing the temperature" />
                        <OTText id="88282a4c-fb2c-11de-a561-214d0adaa7b2" text="by either decreasing the number of molecules or increasing the temperature" />
                        <OTText id="88282a4d-fb2c-11de-a561-214d0adaa7b2" text="by either decreasing the number of molecules or decreasing the temperature" />
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                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8a1f666e-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_15">
                  <prompt>
                    <OTText id="8a1f666f-fb2c-11de-a561-214d0adaa7b2" 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="8a1f6670-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8a1f6671-fb2c-11de-a561-214d0adaa7b2" text="The pressure increases." />
                        <OTText id="8a1f8d82-fb2c-11de-a561-214d0adaa7b2" text="The pressure decreases." />
                        <OTText id="8a1f8d83-fb2c-11de-a561-214d0adaa7b2" text="The pressure stays the same." />
                        <OTText id="8a1f8d84-fb2c-11de-a561-214d0adaa7b2" text="It depends on the type of gas." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8a1f8d82-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8a1fb495-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_16">
                  <prompt>
                    <OTText id="8a1fb496-fb2c-11de-a561-214d0adaa7b2" 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="8a1fb497-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8a1fdba8-fb2c-11de-a561-214d0adaa7b2" text="The balloon will get larger." />
                        <OTText id="8a1fdba9-fb2c-11de-a561-214d0adaa7b2" text="The balloon will get smaller." />
                        <OTText id="8a1fdbaa-fb2c-11de-a561-214d0adaa7b2" text="The balloon will stay the same size." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8a1fdba9-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8a2029cb-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_17">
                  <prompt>
                    <OTText id="8a2029cc-fb2c-11de-a561-214d0adaa7b2" 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="8a2029cd-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8a2029ce-fb2c-11de-a561-214d0adaa7b2" text="adds energy, so the molecules move around much more quickly" />
                        <OTText id="8a2029cf-fb2c-11de-a561-214d0adaa7b2" text="adds more air molecules" />
                        <OTText id="8a2029d0-fb2c-11de-a561-214d0adaa7b2" text="increases the friction between the added air molecules and those originally inside the ball" />
                        <OTText id="8a2050e1-fb2c-11de-a561-214d0adaa7b2" text="causes the ball to get significantly larger" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8a2029cf-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8a216252-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_18">
                  <prompt>
                    <OTText id="8a216253-fb2c-11de-a561-214d0adaa7b2" 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="8a216254-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8a216255-fb2c-11de-a561-214d0adaa7b2" text="Expanding his lungs slows down the air molecules, causing fewer collisions between them." />
                        <OTText id="8a216256-fb2c-11de-a561-214d0adaa7b2" text="Expanding his lungs allows more air molecules to be dissolved into the blood, causing fewer collisions between them." />
                        <OTText id="8a216257-fb2c-11de-a561-214d0adaa7b2" text="Expanding his lungs gives the air molecules more space, causing fewer collisions between them." />
                        <OTText id="8a218968-fb2c-11de-a561-214d0adaa7b2" text="Expanding his lungs adds energy to the air molecules, causing more collisions between them." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8a216257-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8a21b079-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_19">
                  <prompt>
                    <OTText id="8a21b07a-fb2c-11de-a561-214d0adaa7b2" 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="8a21b07b-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8a21b07c-fb2c-11de-a561-214d0adaa7b2" text="the same number of molecules as the smaller one" />
                        <OTText id="8a21b07d-fb2c-11de-a561-214d0adaa7b2" text="twice the number of molecules as the smaller one" />
                        <OTText id="8a21fe9e-fb2c-11de-a561-214d0adaa7b2" text="half the number of molecules as the smaller one" />
                        <OTText id="8a21fe9f-fb2c-11de-a561-214d0adaa7b2" text="four times the number of molecules as the smaller one" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8a21b07d-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8a2225b0-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_20">
                  <prompt>
                    <OTText id="8a2225b1-fb2c-11de-a561-214d0adaa7b2" 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="8a2225b2-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8a2225b3-fb2c-11de-a561-214d0adaa7b2" text="Heating expands the metal of the can, which weakens the seals and allows the already high-pressure gas to escape." />
                        <OTText id="8a224cc4-fb2c-11de-a561-214d0adaa7b2" text="Heating causes a chemical reaction, which creates more gas molecules." />
                        <OTText id="8a224cc5-fb2c-11de-a561-214d0adaa7b2" text="Heating compresses the gases inside the can, which increases the pressure." />
                        <OTText id="8a224cc6-fb2c-11de-a561-214d0adaa7b2" text="Heating increases the force and frequency of molecules colliding with the container." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8a224cc6-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8a2273d7-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_21">
                  <prompt>
                    <OTText id="8a229ae8-fb2c-11de-a561-214d0adaa7b2" 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="8a229ae9-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8a229aea-fb2c-11de-a561-214d0adaa7b2" text="Water molecules chemically react with molecules of the paper towel." />
                        <OTText id="8a229aeb-fb2c-11de-a561-214d0adaa7b2" text="Water molecules are attracted to molecules of the paper towel." />
                        <OTText id="8a229aec-fb2c-11de-a561-214d0adaa7b2" text="Water molecules repel each other and use the paper towel as a way to spread out more." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8a229aeb-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8a22c1fd-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_22">
                  <prompt>
                    <OTText id="8a22c1fe-fb2c-11de-a561-214d0adaa7b2" 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="8a22c1ff-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8a22e910-fb2c-11de-a561-214d0adaa7b2" text="the substance made from polar molecules" />
                        <OTText id="8a22e911-fb2c-11de-a561-214d0adaa7b2" text="the substance made from non-polar molecules" />
                        <OTText id="8a22e912-fb2c-11de-a561-214d0adaa7b2" text="Both have the same boiling point." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8a22e910-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8a231023-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_23">
                  <prompt>
                    <OTText id="8a231024-fb2c-11de-a561-214d0adaa7b2" text="23. What is the reason for your answer above?" />
                  </prompt>
                  <input>
                    <OTChoice id="8a231025-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8a231026-fb2c-11de-a561-214d0adaa7b2" text="Polar molecules form covalent bonds that are much stronger than non-polar bonds." />
                        <OTText id="8a231027-fb2c-11de-a561-214d0adaa7b2" text="Non-polar molecules attract to all other kinds of molecules." />
                        <OTText id="8a233738-fb2c-11de-a561-214d0adaa7b2" text="Molecules of similar size and shape attract to each other equally." />
                        <OTText id="8a233739-fb2c-11de-a561-214d0adaa7b2" text="The intermolecular attractions of polar molecules are stronger than those of non-polar molecules." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8a233739-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8c23c22a-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_24">
                  <prompt>
                    <OTText id="8c23c22b-fb2c-11de-a561-214d0adaa7b2" text="24. A solid made of molecules that fit closely together will melt at" />
                  </prompt>
                  <input>
                    <OTChoice id="8c23c22c-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8c23c22d-fb2c-11de-a561-214d0adaa7b2" text="a lower temperature than loosely packed molecules" />
                        <OTText id="8c23c22e-fb2c-11de-a561-214d0adaa7b2" text="a higher temperature than loosely packed molecules" />
                        <OTText id="8c23c22f-fb2c-11de-a561-214d0adaa7b2" text="the same temperature as loosely packed molecules" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8c23c22e-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8c23e940-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_25">
                  <prompt>
                    <OTText id="8c23e941-fb2c-11de-a561-214d0adaa7b2" text="25. Oil and water DO NOT mix. Why?" />
                  </prompt>
                  <input>
                    <OTChoice id="8c23e942-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8c241053-fb2c-11de-a561-214d0adaa7b2" text="Oil molecules repel water molecules." />
                        <OTText id="8c241054-fb2c-11de-a561-214d0adaa7b2" text="Water molecules repel oil molecules." />
                        <OTText id="8c241055-fb2c-11de-a561-214d0adaa7b2" text="Water molecules attract to other water molecules more strongly than to oil molecules." />
                        <OTText id="8c241056-fb2c-11de-a561-214d0adaa7b2" text="Water molecules are non-polar, so they don't attract to oil molecules very well." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8c241055-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8c243767-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_26">
                  <prompt>
                    <OTText id="8c243768-fb2c-11de-a561-214d0adaa7b2" text="26. What happens when salt dissolves in water?" />
                  </prompt>
                  <input>
                    <OTChoice id="8c243769-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8c24376a-fb2c-11de-a561-214d0adaa7b2" text="The salt ions attract to and are surrounded by water molecules." />
                        <OTText id="8c24376b-fb2c-11de-a561-214d0adaa7b2" text="The salt reacts with the water to form a new substance." />
                        <OTText id="8c245e7c-fb2c-11de-a561-214d0adaa7b2" text="The salt molecules change into water molecules." />
                        <OTText id="8c245e7d-fb2c-11de-a561-214d0adaa7b2" text="The salt ions are destroyed when they come in contact with water." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8c24376a-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8c24858e-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_27">
                  <prompt>
                    <OTText id="8c24858f-fb2c-11de-a561-214d0adaa7b2" 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="8c248590-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8c248591-fb2c-11de-a561-214d0adaa7b2" text="form attractions to water molecules" />
                        <OTText id="8c248592-fb2c-11de-a561-214d0adaa7b2" text="change into water molecules" />
                        <OTText id="8c24aca3-fb2c-11de-a561-214d0adaa7b2" text="chemically react with water molecules" />
                        <OTText id="8c24aca4-fb2c-11de-a561-214d0adaa7b2" text="are destroyed" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8c248591-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8c24d3b5-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_28">
                  <prompt>
                    <OTText id="8c24d3b6-fb2c-11de-a561-214d0adaa7b2" text="28. Table salt (NaCl) dissolves easily in water, but silver chloride (AgCl) does not. Why?" />
                  </prompt>
                  <input>
                    <OTChoice id="8c24d3b7-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8c24d3b8-fb2c-11de-a561-214d0adaa7b2" text="Ag and Cl ions attract better to themselves than to water molecules." />
                        <OTText id="8c24d3b9-fb2c-11de-a561-214d0adaa7b2" text="NaCl has a lower melting point than AgCl." />
                        <OTText id="8c24d3ba-fb2c-11de-a561-214d0adaa7b2" text="NaCl chemically reacts with water to form a new substance." />
                        <OTText id="8c24d3bb-fb2c-11de-a561-214d0adaa7b2" text="Ag and Cl ions are repelled by water molecules." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8c24d3b8-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8c24facc-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_29">
                  <prompt>
                    <OTText id="8c24facd-fb2c-11de-a561-214d0adaa7b2" text="29. Which of the following subatomic particles repel each other but are attracted to a nucleus?" />
                  </prompt>
                  <input>
                    <OTChoice id="8c24face-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8c2521df-fb2c-11de-a561-214d0adaa7b2" text="protons" />
                        <OTText id="8c2521e0-fb2c-11de-a561-214d0adaa7b2" text="neutrons" />
                        <OTText id="8c2521e1-fb2c-11de-a561-214d0adaa7b2" text="electrons" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8c2521e1-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8c2548f2-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_30">
                  <prompt>
                    <OTText id="8c2548f3-fb2c-11de-a561-214d0adaa7b2" 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="8c2548f4-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8c2548f5-fb2c-11de-a561-214d0adaa7b2" text="a straight line" />
                        <OTText id="8c2548f6-fb2c-11de-a561-214d0adaa7b2" text="a bent line" />
                        <OTText id="8c257007-fb2c-11de-a561-214d0adaa7b2" text="a flat, triangular geometry" />
                        <OTText id="8c257008-fb2c-11de-a561-214d0adaa7b2" text="a four-corner pyramid geometry" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8c2548f5-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8c259719-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_31">
                  <prompt>
                    <OTText id="8c25971a-fb2c-11de-a561-214d0adaa7b2" 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="8c25971b-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8c25971c-fb2c-11de-a561-214d0adaa7b2" text="a straight line" />
                        <OTText id="8c25971d-fb2c-11de-a561-214d0adaa7b2" text="a bent line" />
                        <OTText id="8c25be2e-fb2c-11de-a561-214d0adaa7b2" text="a flat, triangular geometry" />
                        <OTText id="8c25be2f-fb2c-11de-a561-214d0adaa7b2" text="a four-corner pyramid geometry" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8c25be2e-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8f1bccb0-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_32">
                  <prompt>
                    <OTText id="8f1bccb1-fb2c-11de-a561-214d0adaa7b2" 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="8f1bccb2-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8f1bccb3-fb2c-11de-a561-214d0adaa7b2" text="All of the hydrogen atoms attract to each other, causing the tetrahedral shape to occur." />
                        <OTText id="8f1bccb4-fb2c-11de-a561-214d0adaa7b2" text="The carbon atom pulls equally on all of the electrons in the C-H bonds." />
                        <OTText id="8f1bf3c5-fb2c-11de-a561-214d0adaa7b2" text="The electron pairs shared in the C-H bonds repel each other, forming a tetrahedral molecule." />
                        <OTText id="8f1bf3c6-fb2c-11de-a561-214d0adaa7b2" text="Molecules can’t be flat. They all have three-dimensional shapes." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8f1bf3c5-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8f1cb717-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_33">
                  <prompt>
                    <OTText id="8f1cb718-fb2c-11de-a561-214d0adaa7b2" text="33. Above is the Lewis dot diagram for COCl2. What is the most likely shape for this molecule?" />
                  </prompt>
                  <input>
                    <OTChoice id="8f1cb719-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8f1cb71a-fb2c-11de-a561-214d0adaa7b2" text="linear" />
                        <OTText id="8f1cb71b-fb2c-11de-a561-214d0adaa7b2" text="bent" />
                        <OTText id="8f1cb71c-fb2c-11de-a561-214d0adaa7b2" text="tetrahedral (four-corner pyramid shape)" />
                        <OTText id="8f1cb71d-fb2c-11de-a561-214d0adaa7b2" text="trigonal planar (flat but shaped like a triangle)" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="8f1cb71d-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="8f1d053e-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_34">
                  <prompt>
                    <OTText id="8f1d053f-fb2c-11de-a561-214d0adaa7b2" text="34. The Lewis dot diagram shown above has an unshared pair of electrons. This unshared pair of electrons" />
                  </prompt>
                  <input>
                    <OTChoice id="8f1d0540-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8f1d0541-fb2c-11de-a561-214d0adaa7b2" text="causes the molecule to lie flat in a plane" />
                        <OTText id="8f1d0542-fb2c-11de-a561-214d0adaa7b2" text="causes the molecule to form a trigonal pyramidal shape" />
                        <OTText id="8f1d0543-fb2c-11de-a561-214d0adaa7b2" text="causes the molecule to be bent" />
                        <OTText id="8f1d2c54-fb2c-11de-a561-214d0adaa7b2" text="has no effect on the shape of the molecule" />
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                </OTQuestion>
                <OTQuestion id="8f1d2c55-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_35">
                  <prompt>
                    <OTText id="8f1d2c56-fb2c-11de-a561-214d0adaa7b2" text="35. Three regions of electron density surround" />
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                  <input>
                    <OTChoice id="8f1d2c57-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="8f1d5368-fb2c-11de-a561-214d0adaa7b2" text="Atom A" />
                        <OTText id="8f1d5369-fb2c-11de-a561-214d0adaa7b2" text="Atom B" />
                        <OTText id="8f1d536a-fb2c-11de-a561-214d0adaa7b2" text="Atom C" />
                        <OTText id="8f1d536b-fb2c-11de-a561-214d0adaa7b2" text="Atoms A and B" />
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                <OTQuestion id="8f1d7a7c-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_36">
                  <prompt>
                    <OTText id="8f1d7a7d-fb2c-11de-a561-214d0adaa7b2" text="36. Four regions of electron density surround" />
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                    <OTChoice id="8f1d7a7e-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="8f1da18f-fb2c-11de-a561-214d0adaa7b2" text="Atom A" />
                        <OTText id="8f1da190-fb2c-11de-a561-214d0adaa7b2" text="Atom B" />
                        <OTText id="8f1da191-fb2c-11de-a561-214d0adaa7b2" text="Atom C" />
                        <OTText id="8f1da192-fb2c-11de-a561-214d0adaa7b2" text="Atoms A and B" />
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                    <object refid="8f1da192-fb2c-11de-a561-214d0adaa7b2" />
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                <OTQuestion id="8f1dc8a3-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_37">
                  <prompt>
                    <OTText id="8f1dc8a4-fb2c-11de-a561-214d0adaa7b2" text="37. Atoms form a covalent bond by" />
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                  <input>
                    <OTChoice id="8f1dc8a5-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="8f1dc8a6-fb2c-11de-a561-214d0adaa7b2" text="sharing protons" />
                        <OTText id="8f1dc8a7-fb2c-11de-a561-214d0adaa7b2" text="sharing neutrons" />
                        <OTText id="8f1defb8-fb2c-11de-a561-214d0adaa7b2" text="sharing electrons" />
                        <OTText id="8f1defb9-fb2c-11de-a561-214d0adaa7b2" text="getting close enough that their nuclei touch" />
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                    <object refid="8f1defb8-fb2c-11de-a561-214d0adaa7b2" />
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                <OTQuestion id="8f1e8bfa-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_38">
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                    <OTText id="8f1e8bfb-fb2c-11de-a561-214d0adaa7b2" text="38. A polar molecule MUST have" />
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                    <OTChoice id="8f1e8bfc-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="8f1e8bfd-fb2c-11de-a561-214d0adaa7b2" text="an overall positive charge" />
                        <OTText id="8f1e8bfe-fb2c-11de-a561-214d0adaa7b2" text="an overall negative charge" />
                        <OTText id="8f1eb30f-fb2c-11de-a561-214d0adaa7b2" text="no overall charge" />
                        <OTText id="8f1eb310-fb2c-11de-a561-214d0adaa7b2" text="a part that has a positive charge and a part that has a negative charge" />
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                <OTQuestion id="91235cb1-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_39">
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                    <OTText id="91235cb2-fb2c-11de-a561-214d0adaa7b2" text="39. A bond formed between two atoms with a moderate difference in electronegativity is" />
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                        <OTText id="91235cb4-fb2c-11de-a561-214d0adaa7b2" text="ionic" />
                        <OTText id="91235cb5-fb2c-11de-a561-214d0adaa7b2" text="polar covalent" />
                        <OTText id="91235cb6-fb2c-11de-a561-214d0adaa7b2" text="non-polar covalent" />
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                <OTQuestion id="912383c7-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_40">
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                    <OTText id="912383c8-fb2c-11de-a561-214d0adaa7b2" text="40. What is the reason for your answer above?" />
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                  <input>
                    <OTChoice id="912383c9-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="9123aada-fb2c-11de-a561-214d0adaa7b2" text="Electronegativity is a measure of the charge of an atom." />
                        <OTText id="9123aadb-fb2c-11de-a561-214d0adaa7b2" text="Electronegativity is a measure of how well an atom holds on to its own electrons." />
                        <OTText id="9123aadc-fb2c-11de-a561-214d0adaa7b2" text="Electronegativity is a measure of how well an atom can attract electrons from other atoms." />
                        <OTText id="9123aadd-fb2c-11de-a561-214d0adaa7b2" text="Electronegativity is a measure of the size of an atom." />
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                    <object refid="9123aadc-fb2c-11de-a561-214d0adaa7b2" />
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                </OTQuestion>
                <OTQuestion id="9123aade-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_41">
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                    <OTText id="9123d1ef-fb2c-11de-a561-214d0adaa7b2" text="41. A bond formed between two atoms that both have high electronegativity is" />
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                    <OTChoice id="9123d1f0-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="9123d1f1-fb2c-11de-a561-214d0adaa7b2" text="ionic" />
                        <OTText id="9123d1f2-fb2c-11de-a561-214d0adaa7b2" text="polar covalent" />
                        <OTText id="9123d1f3-fb2c-11de-a561-214d0adaa7b2" text="non-polar covalent" />
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                <OTQuestion id="9123f904-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_42">
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                    <OTText id="9123f905-fb2c-11de-a561-214d0adaa7b2" text="42. A molecule that is polar must contain" />
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                  <input>
                    <OTChoice id="9123f906-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="9123f907-fb2c-11de-a561-214d0adaa7b2" text="all polar covalent bonds" />
                        <OTText id="91242018-fb2c-11de-a561-214d0adaa7b2" text="mostly non-polar bonds and one polar bond" />
                        <OTText id="91242019-fb2c-11de-a561-214d0adaa7b2" text="one or more non-polar bonds" />
                        <OTText id="9124201a-fb2c-11de-a561-214d0adaa7b2" text="one or more polar bonds" />
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                    <object refid="91242019-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
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                <OTQuestion id="9124201b-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_43">
                  <prompt>
                    <OTText id="9124201c-fb2c-11de-a561-214d0adaa7b2" text="43. In a non-polar covalent bond, both atoms have an identical or very similar charge. Why?" />
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                  <input>
                    <OTChoice id="9124472d-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="9124472e-fb2c-11de-a561-214d0adaa7b2" text="Electrons are shared evenly in non-polar covalent bonds." />
                        <OTText id="9124472f-fb2c-11de-a561-214d0adaa7b2" text="The charge is determined by the distance between the atoms." />
                        <OTText id="91244730-fb2c-11de-a561-214d0adaa7b2" text="Non-polar atoms are made from neutrons, which have no charge." />
                        <OTText id="91244731-fb2c-11de-a561-214d0adaa7b2" text="The polarity of each atom is canceled out, which makes the bond non-polar." />
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                <OTQuestion id="91246e42-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_44">
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                    <OTText id="91246e43-fb2c-11de-a561-214d0adaa7b2" text="44. Melting water is NOT a chemical reaction. Why?" />
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                    <OTChoice id="91246e44-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="91246e45-fb2c-11de-a561-214d0adaa7b2" text="The temperature is not high enough." />
                        <OTText id="91246e46-fb2c-11de-a561-214d0adaa7b2" text="No chemical bonds are broken." />
                        <OTText id="91246e47-fb2c-11de-a561-214d0adaa7b2" text="No chemical bonds are formed." />
                        <OTText id="91246e48-fb2c-11de-a561-214d0adaa7b2" text="Both B and C" />
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                    <object refid="91246e48-fb2c-11de-a561-214d0adaa7b2" />
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                </OTQuestion>
                <OTQuestion id="91249559-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_45">
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                    <OTText id="9124955a-fb2c-11de-a561-214d0adaa7b2" text="45. If the temperature of a chemical reaction is increased, the speed of the reaction is typically" />
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                    <OTChoice id="9124955b-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="9124955c-fb2c-11de-a561-214d0adaa7b2" text="increased" />
                        <OTText id="9124955d-fb2c-11de-a561-214d0adaa7b2" text="decreased" />
                        <OTText id="9124955e-fb2c-11de-a561-214d0adaa7b2" text="not affected" />
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                <OTQuestion id="91257fbf-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_46">
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                    <OTText id="91257fc0-fb2c-11de-a561-214d0adaa7b2" text="46. What is the reason for your answer above?" />
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                  <input>
                    <OTChoice id="91257fc1-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="91257fc2-fb2c-11de-a561-214d0adaa7b2" text="Reactants at a higher temperature interact less often than reactants at a cooler temperature." />
                        <OTText id="91257fc3-fb2c-11de-a561-214d0adaa7b2" text="Reactants at a higher temperature collide more often than reactants at a cooler temperature." />
                        <OTText id="91257fc4-fb2c-11de-a561-214d0adaa7b2" text="Reactants at a higher temperature stick together better than reactants at a cooler temperature." />
                        <OTText id="91257fc5-fb2c-11de-a561-214d0adaa7b2" text="The speed of a reaction cannot be changed." />
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                <OTQuestion id="93cf4306-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_47">
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                    <OTText id="93cf4307-fb2c-11de-a561-214d0adaa7b2" 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" />
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                  <input>
                    <OTChoice id="93cf4308-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="93cf4309-fb2c-11de-a561-214d0adaa7b2" text="form a different substance than they do in a dilute acid" />
                        <OTText id="93cf430a-fb2c-11de-a561-214d0adaa7b2" text="have more collisions with whatever they are reacting with than the molecules of a dilute acid" />
                        <OTText id="93cf6a1b-fb2c-11de-a561-214d0adaa7b2" text="form stronger bonds with whatever they are reacting with than the molecules of the dilute acid" />
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                    <object refid="93cf430a-fb2c-11de-a561-214d0adaa7b2" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="93cf6a1c-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_48">
                  <prompt>
                    <OTText id="93cf6a1d-fb2c-11de-a561-214d0adaa7b2" text="48. Which of the following must be the same for both the reactants and products of a chemical reaction?" />
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                    <OTChoice id="93cf6a1e-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
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                        <OTText id="93cf912f-fb2c-11de-a561-214d0adaa7b2" text="the total mass" />
                        <OTText id="93cf9130-fb2c-11de-a561-214d0adaa7b2" text="the total number of molecules" />
                        <OTText id="93cf9131-fb2c-11de-a561-214d0adaa7b2" text="the total number of atoms of each element" />
                        <OTText id="93cf9132-fb2c-11de-a561-214d0adaa7b2" text="both A and B" />
                        <OTText id="93cfb843-fb2c-11de-a561-214d0adaa7b2" text="both A and C" />
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                <OTQuestion id="93cfdf54-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_49">
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                    <OTText id="93cfdf55-fb2c-11de-a561-214d0adaa7b2">
                      <text>     CH4 + O2 → CO2 + 2 H2O
49. What is one reason the above equation is NOT balanced correctly?</text>
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                    <OTChoice id="93cfdf56-fb2c-11de-a561-214d0adaa7b2" selectionUI="0">
                      <choices>
                        <OTText id="93cfdf57-fb2c-11de-a561-214d0adaa7b2" text="The reaction starts with fewer carbon atoms than it ends with." />
                        <OTText id="93cfdf58-fb2c-11de-a561-214d0adaa7b2" text="The reaction starts with fewer hydrogen atoms than it ends with." />
                        <OTText id="93cfdf59-fb2c-11de-a561-214d0adaa7b2" text="The reaction starts with fewer oxygen atoms than it ends with." />
                        <OTText id="93d0066a-fb2c-11de-a561-214d0adaa7b2" text="All of the above." />
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                <OTQuestion id="93d117db-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_50">
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                    <OTText id="93d117dc-fb2c-11de-a561-214d0adaa7b2">
                      <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>
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                        <OTText id="93d13eee-fb2c-11de-a561-214d0adaa7b2" text="Diagram a" />
                        <OTText id="93d13eef-fb2c-11de-a561-214d0adaa7b2" text="Diagram b" />
                        <OTText id="93d13ef0-fb2c-11de-a561-214d0adaa7b2" text="Diagram c" />
                        <OTText id="93d13ef1-fb2c-11de-a561-214d0adaa7b2" text="Diagram d" />
                        <OTText id="93d13ef2-fb2c-11de-a561-214d0adaa7b2" text="Diagram e" />
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                  </correctAnswer>
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                <OTQuestion id="93d18c13-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_51">
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                    <OTText id="93d18c14-fb2c-11de-a561-214d0adaa7b2" text="51. What is the limiting reactant in the reaction shown in Question 50?" />
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                        <OTText id="93d18c16-fb2c-11de-a561-214d0adaa7b2" text="sulfur (S)" />
                        <OTText id="93d18c17-fb2c-11de-a561-214d0adaa7b2" text="oxygen (O2)" />
                        <OTText id="93d18c18-fb2c-11de-a561-214d0adaa7b2" text="sulfur trioxide (SO3)" />
                        <OTText id="93d18c19-fb2c-11de-a561-214d0adaa7b2" text="both sulfur and oxygen" />
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                <OTQuestion id="93d24f6a-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_52">
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                    <OTText id="93d24f6b-fb2c-11de-a561-214d0adaa7b2" text="52. What kind of reaction is shown above?" />
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                        <OTText id="93d24f6d-fb2c-11de-a561-214d0adaa7b2" text="synthesis" />
                        <OTText id="93d24f6e-fb2c-11de-a561-214d0adaa7b2" text="decomposition" />
                        <OTText id="93d24f6f-fb2c-11de-a561-214d0adaa7b2" text="single replacement" />
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                <OTQuestion id="93d27680-fb2c-11de-a561-214d0adaa7b2" name="ChemMCI_53">
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                    <OTText id="93d27681-fb2c-11de-a561-214d0adaa7b2" text="53. What kind of reaction is shown above?" />
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                        <OTText id="93d27683-fb2c-11de-a561-214d0adaa7b2" text="synthesis" />
                        <OTText id="93d29d94-fb2c-11de-a561-214d0adaa7b2" text="decomposition" />
                        <OTText id="93d29d95-fb2c-11de-a561-214d0adaa7b2" text="single replacement" />
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