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                    <OTText id="03e040a1-b5cf-11df-8bbb-05ff5efea5c3" text="1. What are computer models used for?" />
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                        <OTText id="03e040a3-b5cf-11df-8bbb-05ff5efea5c3" text="making predictions" />
                        <OTText id="03e040a4-b5cf-11df-8bbb-05ff5efea5c3" text="testing theories" />
                        <OTText id="03e040a5-b5cf-11df-8bbb-05ff5efea5c3" text="designing things" />
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                        <OTText id="03e0b5db-b5cf-11df-8bbb-05ff5efea5c3" text="They are a completely accurate reproduction of what they are modeling." />
                        <OTText id="03e0b5dc-b5cf-11df-8bbb-05ff5efea5c3" text="They are a completely accurate reproduction of what they are modeling, except they are scaled differently (smaller or bigger than the real thing)." />
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                        <OTText id="03e103fe-b5cf-11df-8bbb-05ff5efea5c3" 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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                    <OTText id="03e12b10-b5cf-11df-8bbb-05ff5efea5c3" text="3. In which case does it make sense to use a computer model?" />
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                    <OTChoice id="03e12b11-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
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                        <OTText id="03e12b12-b5cf-11df-8bbb-05ff5efea5c3" text="to conduct an experiment that would be too expensive to do in real life" />
                        <OTText id="03e12b13-b5cf-11df-8bbb-05ff5efea5c3" text="to conduct an experiment that would be too dangerous to do in real life" />
                        <OTText id="03e12b14-b5cf-11df-8bbb-05ff5efea5c3" text="to conduct an experiment that would take too long to do in real life" />
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                    <OTText id="03e17937-b5cf-11df-8bbb-05ff5efea5c3" text="4. What is the most likely reason the results from a model may NOT perfectly match reality?" />
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                        <OTText id="03e17939-b5cf-11df-8bbb-05ff5efea5c3" text="All the factors that might affect the model were not considered." />
                        <OTText id="03e1a04a-b5cf-11df-8bbb-05ff5efea5c3" text="The user set the controls or initial parameters so that the starting conditions for the model were unrealistic." />
                        <OTText id="03e1a04b-b5cf-11df-8bbb-05ff5efea5c3" text="The user didn't interpret the results properly." />
                        <OTText id="03e1c75c-b5cf-11df-8bbb-05ff5efea5c3" text="There was a problem with the computer processor." />
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                <OTQuestion id="03e1c75d-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_5">
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                    <OTText id="03e1c75e-b5cf-11df-8bbb-05ff5efea5c3" 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="03e1ee70-b5cf-11df-8bbb-05ff5efea5c3" text="move too fast to be compressed into a smaller volume" />
                        <OTText id="03e1ee71-b5cf-11df-8bbb-05ff5efea5c3" text="are bigger than gas molecules" />
                        <OTText id="03e1ee72-b5cf-11df-8bbb-05ff5efea5c3" text="have very little space between them" />
                        <OTText id="03e21583-b5cf-11df-8bbb-05ff5efea5c3" text="flow freely through their container" />
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                <OTQuestion id="03e23c94-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_6">
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                    <OTText id="03e23c95-b5cf-11df-8bbb-05ff5efea5c3" text="6. What happens as water boils?" />
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                    <OTChoice id="03e23c96-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
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                        <OTText id="03e23c97-b5cf-11df-8bbb-05ff5efea5c3" text="The water molecules overcome their attractions for each other." />
                        <OTText id="03e23c98-b5cf-11df-8bbb-05ff5efea5c3" text="The covalent bonds between the hydrogen and oxygen atoms that make up the water molecules are broken." />
                        <OTText id="03e23c99-b5cf-11df-8bbb-05ff5efea5c3" text="The attractions between the water molecules are weakened." />
                        <OTText id="03e23c9a-b5cf-11df-8bbb-05ff5efea5c3" text="The hydrogen and oxygen atoms that make up the water molecules are destroyed." />
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                <OTQuestion id="0ac5d8fb-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_7">
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                    <OTText id="0ac5d8fc-b5cf-11df-8bbb-05ff5efea5c3" text="7. Heating a solid eventually causes melting. This is because heating a solid" />
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                        <OTText id="0ac5d8fe-b5cf-11df-8bbb-05ff5efea5c3" text="gives the atoms more kinetic energy, so they can overcome some of their attractions" />
                        <OTText id="0ac5d8ff-b5cf-11df-8bbb-05ff5efea5c3" text="loosens the material between the atoms, allowing them to move past each other" />
                        <OTText id="0ac5d900-b5cf-11df-8bbb-05ff5efea5c3" text="creates a chemical reaction that turns the solid into a liquid" />
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                <OTQuestion id="0ac5ff11-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_8">
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                    <OTText id="0ac5ff12-b5cf-11df-8bbb-05ff5efea5c3" text="8. When nitrogen gas is cooled to a low enough temperature, it becomes a liquid. Why?" />
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                        <OTText id="0ac5ff14-b5cf-11df-8bbb-05ff5efea5c3" text="The energy of the nitrogen gas decreases, and the nitrogen molecules stop moving." />
                        <OTText id="0ac5ff15-b5cf-11df-8bbb-05ff5efea5c3" text="The cold energy of the nitrogen gas increases, and the nitrogen molecules bind together." />
                        <OTText id="0ac62626-b5cf-11df-8bbb-05ff5efea5c3" text="A chemical reaction happens, and the nitrogen gas changes into water." />
                        <OTText id="0ac62627-b5cf-11df-8bbb-05ff5efea5c3" text="The nitrogen molecules move more slowly and don't have enough energy to overcome their attractive forces." />
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                <OTQuestion id="0ac62628-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_10">
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                    <OTText id="0ac62629-b5cf-11df-8bbb-05ff5efea5c3" 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="0ac64d3a-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
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                        <OTText id="0ac64d3b-b5cf-11df-8bbb-05ff5efea5c3" text="have weaker attractions to each other" />
                        <OTText id="0ac64d3c-b5cf-11df-8bbb-05ff5efea5c3" text="have stronger attractions to each other" />
                        <OTText id="0ac64d3d-b5cf-11df-8bbb-05ff5efea5c3" text="are harder to break down into atoms" />
                        <OTText id="0ac64d3e-b5cf-11df-8bbb-05ff5efea5c3" text="do not absorb heat well" />
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                <OTQuestion id="0ac6744f-b5cf-11df-8bbb-05ff5efea5c3" name="http://ri-itest.concord.org/SAMActivities/MCI-chem/ChemMCI_v3_pre/page2.cml">
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                    <OTText id="0ac67450-b5cf-11df-8bbb-05ff5efea5c3" 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="0ac67451-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
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                        <OTText id="0ac67452-b5cf-11df-8bbb-05ff5efea5c3" text="The heat energy is being used to break up the water molecules into hydrogen and oxygen molecules." />
                        <OTText id="0ac69b63-b5cf-11df-8bbb-05ff5efea5c3" text="The heat energy is being used to overcome the attractions between molecules." />
                        <OTText id="0ac69b64-b5cf-11df-8bbb-05ff5efea5c3" text="The heat energy is being used to destroy some of the hydrogen and oxygen atoms that make up the water molecules." />
                        <OTText id="0ac69b65-b5cf-11df-8bbb-05ff5efea5c3" text="Water cannot get any hotter than 100°C. That is its maximum temperature." />
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                <OTQuestion id="0ac6c276-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_11">
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                    <OTText id="0ac6c277-b5cf-11df-8bbb-05ff5efea5c3" text="11. As water evaporates from your skin, it feels cooler there. This is because during evaporation" />
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                        <OTText id="0ac6e989-b5cf-11df-8bbb-05ff5efea5c3" text="the molecules with the highest energy evaporate first, lowering the temperature of the remaining water" />
                        <OTText id="0ac6e98a-b5cf-11df-8bbb-05ff5efea5c3" text="water molecules condense in the air around the water, cooling the nearby skin molecules" />
                        <OTText id="0ac7109b-b5cf-11df-8bbb-05ff5efea5c3" text="cold energy is transmitted through collisions from the water molecules to the skin molecules" />
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                <OTQuestion id="0ac737ac-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_12">
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                    <OTText id="0ac737ad-b5cf-11df-8bbb-05ff5efea5c3" 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="0ac737af-b5cf-11df-8bbb-05ff5efea5c3" text="the mass of the individual molecules that are colliding against the object" />
                        <OTText id="0ac737b0-b5cf-11df-8bbb-05ff5efea5c3" text="the frequency of the molecular collisions against the object" />
                        <OTText id="0ac737b1-b5cf-11df-8bbb-05ff5efea5c3" text="the force with which each molecule collides against the object" />
                        <OTText id="0ac75ec2-b5cf-11df-8bbb-05ff5efea5c3" text="both A and B" />
                        <OTText id="0ac75ec3-b5cf-11df-8bbb-05ff5efea5c3" text="both B and C" />
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                <OTQuestion id="0ac87034-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_13">
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                    <OTText id="0ac87035-b5cf-11df-8bbb-05ff5efea5c3" text="13. A balloon filled with a gas will expand when heated. Why does this happen?" />
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                        <OTText id="0ac89747-b5cf-11df-8bbb-05ff5efea5c3" text="The number of atoms inside the balloon increases, so the atoms take up more space." />
                        <OTText id="0ac89748-b5cf-11df-8bbb-05ff5efea5c3" text="The atoms collide more forcefully, increasing the space between them." />
                        <OTText id="0ac89749-b5cf-11df-8bbb-05ff5efea5c3" text="The material between atoms expands, increasing the size of the balloon." />
                        <OTText id="0ac8974a-b5cf-11df-8bbb-05ff5efea5c3" text="The forces between atoms weaken, allowing the atoms to separate from each other." />
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                <OTQuestion id="0ac8be5b-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_14">
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                    <OTText id="0ac8be5c-b5cf-11df-8bbb-05ff5efea5c3" 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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                  <input>
                    <OTChoice id="0ac8be5d-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="0ac8be5e-b5cf-11df-8bbb-05ff5efea5c3" text="by either increasing the number of molecules or increasing the temperature" />
                        <OTText id="0ac8be5f-b5cf-11df-8bbb-05ff5efea5c3" text="by either increasing the number of molecules or decreasing the temperature" />
                        <OTText id="0ac8be60-b5cf-11df-8bbb-05ff5efea5c3" text="by either decreasing the number of molecules or increasing the temperature" />
                        <OTText id="0ac8e571-b5cf-11df-8bbb-05ff5efea5c3" text="by either decreasing the number of molecules or decreasing the temperature" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="0ac8be5e-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="0d5360e2-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_15">
                  <prompt>
                    <OTText id="0d5387f3-b5cf-11df-8bbb-05ff5efea5c3" 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="0d5387f4-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="0d5387f5-b5cf-11df-8bbb-05ff5efea5c3" text="The pressure increases." />
                        <OTText id="0d5387f6-b5cf-11df-8bbb-05ff5efea5c3" text="The pressure decreases." />
                        <OTText id="0d5387f7-b5cf-11df-8bbb-05ff5efea5c3" text="The pressure stays the same." />
                        <OTText id="0d5387f8-b5cf-11df-8bbb-05ff5efea5c3" text="It depends on the type of gas." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="0d5387f6-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="0d53af09-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_16">
                  <prompt>
                    <OTText id="0d53af0a-b5cf-11df-8bbb-05ff5efea5c3" 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="0d53af0b-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="0d53fd2c-b5cf-11df-8bbb-05ff5efea5c3" text="The balloon will get larger." />
                        <OTText id="0d53fd2d-b5cf-11df-8bbb-05ff5efea5c3" text="The balloon will get smaller." />
                        <OTText id="0d53fd2e-b5cf-11df-8bbb-05ff5efea5c3" text="The balloon will stay the same size." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="0d53fd2d-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="0d54243f-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_17">
                  <prompt>
                    <OTText id="0d542440-b5cf-11df-8bbb-05ff5efea5c3" 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="0d542441-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="0d542442-b5cf-11df-8bbb-05ff5efea5c3" text="adds energy, so the molecules move around much more quickly" />
                        <OTText id="0d542443-b5cf-11df-8bbb-05ff5efea5c3" text="adds more air molecules" />
                        <OTText id="0d542444-b5cf-11df-8bbb-05ff5efea5c3" text="increases the friction between the added air molecules and those originally inside the ball" />
                        <OTText id="0d542445-b5cf-11df-8bbb-05ff5efea5c3" text="causes the ball to get significantly larger" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="0d542443-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="0d544b56-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_18">
                  <prompt>
                    <OTText id="0d544b57-b5cf-11df-8bbb-05ff5efea5c3" 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="0d544b58-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="0d547269-b5cf-11df-8bbb-05ff5efea5c3" text="Expanding his lungs slows down the air molecules, causing fewer collisions between them." />
                        <OTText id="0d54726a-b5cf-11df-8bbb-05ff5efea5c3" text="Expanding his lungs allows more air molecules to be dissolved into the blood, causing fewer collisions between them." />
                        <OTText id="0d54726b-b5cf-11df-8bbb-05ff5efea5c3" text="Expanding his lungs gives the air molecules more space, causing fewer collisions between them." />
                        <OTText id="0d54726c-b5cf-11df-8bbb-05ff5efea5c3" text="Expanding his lungs adds energy to the air molecules, causing more collisions between them." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="0d54726b-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="0d54997d-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_19">
                  <prompt>
                    <OTText id="0d54997e-b5cf-11df-8bbb-05ff5efea5c3" 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="0d54997f-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="0d549980-b5cf-11df-8bbb-05ff5efea5c3" text="the same number of molecules as the smaller one" />
                        <OTText id="0d549981-b5cf-11df-8bbb-05ff5efea5c3" text="twice the number of molecules as the smaller one" />
                        <OTText id="0d54c092-b5cf-11df-8bbb-05ff5efea5c3" text="half the number of molecules as the smaller one" />
                        <OTText id="0d54c093-b5cf-11df-8bbb-05ff5efea5c3" text="four times the number of molecules as the smaller one" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="0d549981-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="0d54e7a4-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_20">
                  <prompt>
                    <OTText id="0d550eb5-b5cf-11df-8bbb-05ff5efea5c3" 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="0d550eb6-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="0d550eb7-b5cf-11df-8bbb-05ff5efea5c3" text="Heating expands the metal of the can, which weakens the seals and allows the already high-pressure gas to escape." />
                        <OTText id="0d550eb8-b5cf-11df-8bbb-05ff5efea5c3" text="Heating causes a chemical reaction, which creates more gas molecules." />
                        <OTText id="0d550eb9-b5cf-11df-8bbb-05ff5efea5c3" text="Heating compresses the gases inside the can, which increases the pressure." />
                        <OTText id="0d550eba-b5cf-11df-8bbb-05ff5efea5c3" text="Heating increases the force and frequency of molecules colliding with the container." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="0d550eba-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="0d5535cb-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_21">
                  <prompt>
                    <OTText id="0d5535cc-b5cf-11df-8bbb-05ff5efea5c3" 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="0d5535cd-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="0d5535ce-b5cf-11df-8bbb-05ff5efea5c3" text="Water molecules chemically react with molecules of the paper towel." />
                        <OTText id="0d5535cf-b5cf-11df-8bbb-05ff5efea5c3" text="Water molecules are attracted to molecules of the paper towel." />
                        <OTText id="0d555ce0-b5cf-11df-8bbb-05ff5efea5c3" text="Water molecules repel each other and use the paper towel as a way to spread out more." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="0d5535cf-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="0d555ce1-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_22">
                  <prompt>
                    <OTText id="0d555ce2-b5cf-11df-8bbb-05ff5efea5c3" 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="0d555ce3-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="0d5583f4-b5cf-11df-8bbb-05ff5efea5c3" text="the substance made from polar molecules" />
                        <OTText id="0d5583f5-b5cf-11df-8bbb-05ff5efea5c3" text="the substance made from non-polar molecules" />
                        <OTText id="0d5583f6-b5cf-11df-8bbb-05ff5efea5c3" text="Both have the same boiling point." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="0d5583f4-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="0d55ab07-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_23">
                  <prompt>
                    <OTText id="0d55ab08-b5cf-11df-8bbb-05ff5efea5c3" text="23. What is the reason for your answer above?" />
                  </prompt>
                  <input>
                    <OTChoice id="0d55ab09-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="0d55ab0a-b5cf-11df-8bbb-05ff5efea5c3" text="Polar molecules form covalent bonds that are much stronger than non-polar bonds." />
                        <OTText id="0d55ab0b-b5cf-11df-8bbb-05ff5efea5c3" text="Non-polar molecules attract to all other kinds of molecules." />
                        <OTText id="0d55d21c-b5cf-11df-8bbb-05ff5efea5c3" text="Molecules of similar size and shape attract to each other equally." />
                        <OTText id="0d55d21d-b5cf-11df-8bbb-05ff5efea5c3" text="The intermolecular attractions of polar molecules are stronger than those of non-polar molecules." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="0d55d21d-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="1098c81e-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_24">
                  <prompt>
                    <OTText id="1098c81f-b5cf-11df-8bbb-05ff5efea5c3" text="24. A solid made of molecules that fit closely together will melt at" />
                  </prompt>
                  <input>
                    <OTChoice id="1098c820-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1098ef31-b5cf-11df-8bbb-05ff5efea5c3" text="a lower temperature than loosely packed molecules" />
                        <OTText id="1098ef32-b5cf-11df-8bbb-05ff5efea5c3" text="a higher temperature than loosely packed molecules" />
                        <OTText id="1098ef33-b5cf-11df-8bbb-05ff5efea5c3" text="the same temperature as loosely packed molecules" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="1098ef32-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="1098ef34-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_25">
                  <prompt>
                    <OTText id="1098ef35-b5cf-11df-8bbb-05ff5efea5c3" text="25. Oil and water DO NOT mix. Why?" />
                  </prompt>
                  <input>
                    <OTChoice id="1098ef36-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="10991647-b5cf-11df-8bbb-05ff5efea5c3" text="Oil molecules repel water molecules." />
                        <OTText id="10991648-b5cf-11df-8bbb-05ff5efea5c3" text="Water molecules repel oil molecules." />
                        <OTText id="10991649-b5cf-11df-8bbb-05ff5efea5c3" text="Water molecules attract to other water molecules more strongly than to oil molecules." />
                        <OTText id="1099164a-b5cf-11df-8bbb-05ff5efea5c3" text="Water molecules are non-polar, so they don't attract to oil molecules very well." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="10991649-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="1099164b-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_26">
                  <prompt>
                    <OTText id="10993d5c-b5cf-11df-8bbb-05ff5efea5c3" text="26. What happens when salt dissolves in water?" />
                  </prompt>
                  <input>
                    <OTChoice id="10993d5d-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="10993d5e-b5cf-11df-8bbb-05ff5efea5c3" text="The salt ions attract to and are surrounded by water molecules." />
                        <OTText id="10993d5f-b5cf-11df-8bbb-05ff5efea5c3" text="The salt reacts with the water to form a new substance." />
                        <OTText id="10993d60-b5cf-11df-8bbb-05ff5efea5c3" text="The salt molecules change into water molecules." />
                        <OTText id="10993d61-b5cf-11df-8bbb-05ff5efea5c3" text="The salt ions are destroyed when they come in contact with water." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="10993d5e-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="10996472-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_27">
                  <prompt>
                    <OTText id="10996473-b5cf-11df-8bbb-05ff5efea5c3" 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="10996474-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="10996475-b5cf-11df-8bbb-05ff5efea5c3" text="form attractions to water molecules" />
                        <OTText id="10996476-b5cf-11df-8bbb-05ff5efea5c3" text="change into water molecules" />
                        <OTText id="10996477-b5cf-11df-8bbb-05ff5efea5c3" text="chemically react with water molecules" />
                        <OTText id="10996478-b5cf-11df-8bbb-05ff5efea5c3" text="are destroyed" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="10996475-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="10998b89-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_28">
                  <prompt>
                    <OTText id="10998b8a-b5cf-11df-8bbb-05ff5efea5c3" text="28. Table salt (NaCl) dissolves easily in water, but silver chloride (AgCl) does not. Why?" />
                  </prompt>
                  <input>
                    <OTChoice id="10998b8b-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="10998b8c-b5cf-11df-8bbb-05ff5efea5c3" text="Ag and Cl ions attract better to themselves than to water molecules." />
                        <OTText id="10998b8d-b5cf-11df-8bbb-05ff5efea5c3" text="NaCl has a lower melting point than AgCl." />
                        <OTText id="10998b8e-b5cf-11df-8bbb-05ff5efea5c3" text="NaCl chemically reacts with water to form a new substance." />
                        <OTText id="1099b29f-b5cf-11df-8bbb-05ff5efea5c3" text="Ag and Cl ions are repelled by water molecules." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="10998b8c-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="1099b2a0-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_29">
                  <prompt>
                    <OTText id="1099b2a1-b5cf-11df-8bbb-05ff5efea5c3" text="29. Which of the following subatomic particles repel each other but are attracted to a nucleus?" />
                  </prompt>
                  <input>
                    <OTChoice id="1099b2a2-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1099b2a3-b5cf-11df-8bbb-05ff5efea5c3" text="protons" />
                        <OTText id="1099d9b4-b5cf-11df-8bbb-05ff5efea5c3" text="neutrons" />
                        <OTText id="1099d9b5-b5cf-11df-8bbb-05ff5efea5c3" text="electrons" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="1099d9b5-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="109a00c6-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_30">
                  <prompt>
                    <OTText id="109a00c7-b5cf-11df-8bbb-05ff5efea5c3" 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="109a00c8-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="109a00c9-b5cf-11df-8bbb-05ff5efea5c3" text="a straight line" />
                        <OTText id="109a00ca-b5cf-11df-8bbb-05ff5efea5c3" text="a bent line" />
                        <OTText id="109a27db-b5cf-11df-8bbb-05ff5efea5c3" text="a flat, triangular geometry" />
                        <OTText id="109a27dc-b5cf-11df-8bbb-05ff5efea5c3" text="a four-corner pyramid geometry" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="109a00c9-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="109a27dd-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_31">
                  <prompt>
                    <OTText id="109a27de-b5cf-11df-8bbb-05ff5efea5c3" 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="109a27df-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="109a27e0-b5cf-11df-8bbb-05ff5efea5c3" text="a straight line" />
                        <OTText id="109a4ef1-b5cf-11df-8bbb-05ff5efea5c3" text="a bent line" />
                        <OTText id="109a4ef2-b5cf-11df-8bbb-05ff5efea5c3" text="a flat, triangular geometry" />
                        <OTText id="109a4ef3-b5cf-11df-8bbb-05ff5efea5c3" text="a four-corner pyramid geometry" />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="109a4ef2-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="1596dbd4-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_32">
                  <prompt>
                    <OTText id="1596dbd5-b5cf-11df-8bbb-05ff5efea5c3" 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="1596dbd6-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1596dbd7-b5cf-11df-8bbb-05ff5efea5c3" text="All of the hydrogen atoms attract to each other, causing the tetrahedral shape to occur." />
                        <OTText id="159702e8-b5cf-11df-8bbb-05ff5efea5c3" text="The carbon atom pulls equally on all of the electrons in the C-H bonds." />
                        <OTText id="159702e9-b5cf-11df-8bbb-05ff5efea5c3" text="The electron pairs shared in the C-H bonds repel each other, forming a tetrahedral molecule." />
                        <OTText id="159729fa-b5cf-11df-8bbb-05ff5efea5c3" text="Molecules can’t be flat. They all have three-dimensional shapes." />
                      </choices>
                    </OTChoice>
                  </input>
                  <correctAnswer>
                    <object refid="159702e9-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="1597510b-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_33">
                  <prompt>
                    <OTText id="1597510c-b5cf-11df-8bbb-05ff5efea5c3" text="33. Above is the Lewis dot diagram for COCl2. What is the most likely shape for this molecule?" />
                  </prompt>
                  <input>
                    <OTChoice id="1597510d-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1597510e-b5cf-11df-8bbb-05ff5efea5c3" text="linear" />
                        <OTText id="1597510f-b5cf-11df-8bbb-05ff5efea5c3" text="bent" />
                        <OTText id="15977820-b5cf-11df-8bbb-05ff5efea5c3" text="tetrahedral (four-corner pyramid shape)" />
                        <OTText id="15977821-b5cf-11df-8bbb-05ff5efea5c3" text="trigonal planar (flat but shaped like a triangle)" />
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                <OTQuestion id="15979f32-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_34">
                  <prompt>
                    <OTText id="15979f33-b5cf-11df-8bbb-05ff5efea5c3" text="34. The Lewis dot diagram shown above has an unshared pair of electrons. This unshared pair of electrons" />
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                    <OTChoice id="15979f34-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="15979f35-b5cf-11df-8bbb-05ff5efea5c3" text="causes the molecule to lie flat in a plane" />
                        <OTText id="15979f36-b5cf-11df-8bbb-05ff5efea5c3" text="causes the molecule to form a trigonal pyramidal shape" />
                        <OTText id="15979f37-b5cf-11df-8bbb-05ff5efea5c3" text="causes the molecule to be bent" />
                        <OTText id="15979f38-b5cf-11df-8bbb-05ff5efea5c3" text="has no effect on the shape of the molecule" />
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                <OTQuestion id="1597c649-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_35">
                  <prompt>
                    <OTText id="1597c64a-b5cf-11df-8bbb-05ff5efea5c3" text="35. Three regions of electron density surround" />
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                    <OTChoice id="1597c64b-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1597c64c-b5cf-11df-8bbb-05ff5efea5c3" text="Atom A" />
                        <OTText id="1597c64d-b5cf-11df-8bbb-05ff5efea5c3" text="Atom B" />
                        <OTText id="1597ed5e-b5cf-11df-8bbb-05ff5efea5c3" text="Atom C" />
                        <OTText id="1597ed5f-b5cf-11df-8bbb-05ff5efea5c3" text="Atoms A and B" />
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                <OTQuestion id="15981470-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_36">
                  <prompt>
                    <OTText id="15981471-b5cf-11df-8bbb-05ff5efea5c3" text="36. Four regions of electron density surround" />
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                  <input>
                    <OTChoice id="15981472-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="15981473-b5cf-11df-8bbb-05ff5efea5c3" text="Atom A" />
                        <OTText id="15981474-b5cf-11df-8bbb-05ff5efea5c3" text="Atom B" />
                        <OTText id="15981475-b5cf-11df-8bbb-05ff5efea5c3" text="Atom C" />
                        <OTText id="15981476-b5cf-11df-8bbb-05ff5efea5c3" text="Atoms A and B" />
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                <OTQuestion id="15983b87-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_37">
                  <prompt>
                    <OTText id="15983b88-b5cf-11df-8bbb-05ff5efea5c3" text="37. Atoms form a covalent bond by" />
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                    <OTChoice id="15983b89-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="15983b8a-b5cf-11df-8bbb-05ff5efea5c3" text="sharing protons" />
                        <OTText id="15983b8b-b5cf-11df-8bbb-05ff5efea5c3" text="sharing neutrons" />
                        <OTText id="15983b8c-b5cf-11df-8bbb-05ff5efea5c3" text="sharing electrons" />
                        <OTText id="15983b8d-b5cf-11df-8bbb-05ff5efea5c3" text="getting close enough that their nuclei touch" />
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                    <object refid="15983b8c-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="1598629e-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_38">
                  <prompt>
                    <OTText id="1598629f-b5cf-11df-8bbb-05ff5efea5c3" text="38. A polar molecule MUST have" />
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                  <input>
                    <OTChoice id="159862a0-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="159862a1-b5cf-11df-8bbb-05ff5efea5c3" text="an overall positive charge" />
                        <OTText id="159862a2-b5cf-11df-8bbb-05ff5efea5c3" text="an overall negative charge" />
                        <OTText id="159889b3-b5cf-11df-8bbb-05ff5efea5c3" text="no overall charge" />
                        <OTText id="159889b4-b5cf-11df-8bbb-05ff5efea5c3" text="a part that has a positive charge and a part that has a negative charge" />
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                    </OTChoice>
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                    <object refid="159889b4-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
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                <OTQuestion id="1a122af5-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_39">
                  <prompt>
                    <OTText id="1a122af6-b5cf-11df-8bbb-05ff5efea5c3" text="39. A bond formed between two atoms with a moderate difference in electronegativity is" />
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                    <OTChoice id="1a122af7-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1a122af8-b5cf-11df-8bbb-05ff5efea5c3" text="ionic" />
                        <OTText id="1a125209-b5cf-11df-8bbb-05ff5efea5c3" text="polar covalent" />
                        <OTText id="1a12520a-b5cf-11df-8bbb-05ff5efea5c3" text="non-polar covalent" />
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                    <object refid="1a125209-b5cf-11df-8bbb-05ff5efea5c3" />
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                <OTQuestion id="1a12791b-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_40">
                  <prompt>
                    <OTText id="1a12791c-b5cf-11df-8bbb-05ff5efea5c3" text="40. What is the reason for your answer above?" />
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                  <input>
                    <OTChoice id="1a12791d-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1a12a02e-b5cf-11df-8bbb-05ff5efea5c3" text="Electronegativity is a measure of the charge of an atom." />
                        <OTText id="1a12a02f-b5cf-11df-8bbb-05ff5efea5c3" text="Electronegativity is a measure of how well an atom holds on to its own electrons." />
                        <OTText id="1a12a030-b5cf-11df-8bbb-05ff5efea5c3" text="Electronegativity is a measure of how well an atom can attract electrons from other atoms." />
                        <OTText id="1a12a031-b5cf-11df-8bbb-05ff5efea5c3" text="Electronegativity is a measure of the size of an atom." />
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                <OTQuestion id="1a12c742-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_41">
                  <prompt>
                    <OTText id="1a12c743-b5cf-11df-8bbb-05ff5efea5c3" text="41. A bond formed between two atoms that both have high electronegativity is" />
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                    <OTChoice id="1a12c744-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1a12c745-b5cf-11df-8bbb-05ff5efea5c3" text="ionic" />
                        <OTText id="1a12c746-b5cf-11df-8bbb-05ff5efea5c3" text="polar covalent" />
                        <OTText id="1a12c747-b5cf-11df-8bbb-05ff5efea5c3" text="non-polar covalent" />
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                    <object refid="1a12c747-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
                </OTQuestion>
                <OTQuestion id="1a12ee58-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_42">
                  <prompt>
                    <OTText id="1a12ee59-b5cf-11df-8bbb-05ff5efea5c3" text="42. A molecule that is polar must contain" />
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                  <input>
                    <OTChoice id="1a12ee5a-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1a12ee5b-b5cf-11df-8bbb-05ff5efea5c3" text="all polar covalent bonds" />
                        <OTText id="1a12ee5c-b5cf-11df-8bbb-05ff5efea5c3" text="mostly non-polar bonds and one polar bond" />
                        <OTText id="1a12ee5d-b5cf-11df-8bbb-05ff5efea5c3" text="one or more non-polar bonds" />
                        <OTText id="1a12ee5e-b5cf-11df-8bbb-05ff5efea5c3" text="one or more polar bonds" />
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                    </OTChoice>
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                  <correctAnswer>
                    <object refid="1a12ee5e-b5cf-11df-8bbb-05ff5efea5c3" />
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                <OTQuestion id="1a13156f-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_43">
                  <prompt>
                    <OTText id="1a131570-b5cf-11df-8bbb-05ff5efea5c3" 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="1a131571-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1a131572-b5cf-11df-8bbb-05ff5efea5c3" text="Electrons are shared evenly in non-polar covalent bonds." />
                        <OTText id="1a131573-b5cf-11df-8bbb-05ff5efea5c3" text="The charge is determined by the distance between the atoms." />
                        <OTText id="1a131574-b5cf-11df-8bbb-05ff5efea5c3" text="Non-polar atoms are made from neutrons, which have no charge." />
                        <OTText id="1a133c85-b5cf-11df-8bbb-05ff5efea5c3" text="The polarity of each atom is canceled out, which makes the bond non-polar." />
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                <OTQuestion id="1a133c86-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_44">
                  <prompt>
                    <OTText id="1a133c87-b5cf-11df-8bbb-05ff5efea5c3" text="44. Melting water is NOT a chemical reaction. Why?" />
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                    <OTChoice id="1a133c88-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1a133c89-b5cf-11df-8bbb-05ff5efea5c3" text="The temperature is not high enough." />
                        <OTText id="1a133c8a-b5cf-11df-8bbb-05ff5efea5c3" text="No chemical bonds are broken." />
                        <OTText id="1a13639b-b5cf-11df-8bbb-05ff5efea5c3" text="No chemical bonds are formed." />
                        <OTText id="1a13639c-b5cf-11df-8bbb-05ff5efea5c3" text="Both B and C" />
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                    <object refid="1a13639c-b5cf-11df-8bbb-05ff5efea5c3" />
                  </correctAnswer>
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                <OTQuestion id="1a13639d-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_45">
                  <prompt>
                    <OTText id="1a13639e-b5cf-11df-8bbb-05ff5efea5c3" text="45. If the temperature of a chemical reaction is increased, the speed of the reaction is typically" />
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                  <input>
                    <OTChoice id="1a13639f-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1a1363a0-b5cf-11df-8bbb-05ff5efea5c3" text="increased" />
                        <OTText id="1a1389b1-b5cf-11df-8bbb-05ff5efea5c3" text="decreased" />
                        <OTText id="1a1389b2-b5cf-11df-8bbb-05ff5efea5c3" text="not affected" />
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                    <object refid="1a1363a0-b5cf-11df-8bbb-05ff5efea5c3" />
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                <OTQuestion id="1a1389b3-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_46">
                  <prompt>
                    <OTText id="1a1389b4-b5cf-11df-8bbb-05ff5efea5c3" text="46. What is the reason for your answer above?" />
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                    <OTChoice id="1a1389b5-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1a1389b6-b5cf-11df-8bbb-05ff5efea5c3" text="Reactants at a higher temperature interact less often than reactants at a cooler temperature." />
                        <OTText id="1a13b0c7-b5cf-11df-8bbb-05ff5efea5c3" text="Reactants at a higher temperature collide more often than reactants at a cooler temperature." />
                        <OTText id="1a13b0c8-b5cf-11df-8bbb-05ff5efea5c3" text="Reactants at a higher temperature stick together better than reactants at a cooler temperature." />
                        <OTText id="1a13b0c9-b5cf-11df-8bbb-05ff5efea5c3" text="The speed of a reaction cannot be changed." />
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                <OTQuestion id="1d966eea-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_47">
                  <prompt>
                    <OTText id="1d966eeb-b5cf-11df-8bbb-05ff5efea5c3" 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="1d966eec-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1d966eed-b5cf-11df-8bbb-05ff5efea5c3" text="form a different substance than they do in a dilute acid" />
                        <OTText id="1d9695fe-b5cf-11df-8bbb-05ff5efea5c3" text="have more collisions with whatever they are reacting with than the molecules of a dilute acid" />
                        <OTText id="1d9695ff-b5cf-11df-8bbb-05ff5efea5c3" text="form stronger bonds with whatever they are reacting with than the molecules of the dilute acid" />
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                    <object refid="1d9695fe-b5cf-11df-8bbb-05ff5efea5c3" />
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                <OTQuestion id="1d969600-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_48">
                  <prompt>
                    <OTText id="1d969601-b5cf-11df-8bbb-05ff5efea5c3" 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="1d969602-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
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                        <OTText id="1d969603-b5cf-11df-8bbb-05ff5efea5c3" text="the total mass" />
                        <OTText id="1d96bd14-b5cf-11df-8bbb-05ff5efea5c3" text="the total number of molecules" />
                        <OTText id="1d96bd15-b5cf-11df-8bbb-05ff5efea5c3" text="the total number of atoms of each element" />
                        <OTText id="1d96bd16-b5cf-11df-8bbb-05ff5efea5c3" text="both A and B" />
                        <OTText id="1d96bd17-b5cf-11df-8bbb-05ff5efea5c3" text="both A and C" />
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                <OTQuestion id="1d96e428-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_49">
                  <prompt>
                    <OTText id="1d96e429-b5cf-11df-8bbb-05ff5efea5c3">
                      <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="1d96e42a-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1d96e42b-b5cf-11df-8bbb-05ff5efea5c3" text="The reaction ends with more carbon atoms than it starts with." />
                        <OTText id="1d96e42c-b5cf-11df-8bbb-05ff5efea5c3" text="The reaction ends with more hydrogen atoms than it starts with." />
                        <OTText id="1d970b3d-b5cf-11df-8bbb-05ff5efea5c3" text="The reaction ends with more oxygen atoms than it starts with." />
                        <OTText id="1d970b3e-b5cf-11df-8bbb-05ff5efea5c3" text="All of the above." />
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                <OTQuestion id="1d970b3f-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_50">
                  <prompt>
                    <OTText id="1d970b40-b5cf-11df-8bbb-05ff5efea5c3">
                      <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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                    <OTChoice id="1d970b41-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1d973252-b5cf-11df-8bbb-05ff5efea5c3" text="Diagram a" />
                        <OTText id="1d973253-b5cf-11df-8bbb-05ff5efea5c3" text="Diagram b" />
                        <OTText id="1d973254-b5cf-11df-8bbb-05ff5efea5c3" text="Diagram c" />
                        <OTText id="1d973255-b5cf-11df-8bbb-05ff5efea5c3" text="Diagram d" />
                        <OTText id="1d973256-b5cf-11df-8bbb-05ff5efea5c3" text="Diagram e" />
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                <OTQuestion id="1d97f5a7-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_51">
                  <prompt>
                    <OTText id="1d97f5a8-b5cf-11df-8bbb-05ff5efea5c3" text="51. What is the limiting reactant in the reaction shown in Question 50?" />
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                    <OTChoice id="1d97f5a9-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1d97f5aa-b5cf-11df-8bbb-05ff5efea5c3" text="sulfur (S)" />
                        <OTText id="1d981cbb-b5cf-11df-8bbb-05ff5efea5c3" text="oxygen (O2)" />
                        <OTText id="1d981cbc-b5cf-11df-8bbb-05ff5efea5c3" text="sulfur trioxide (SO3)" />
                        <OTText id="1d981cbd-b5cf-11df-8bbb-05ff5efea5c3" text="both sulfur and oxygen" />
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                <OTQuestion id="1d981cbe-b5cf-11df-8bbb-05ff5efea5c3" name="ChemMCI_52">
                  <prompt>
                    <OTText id="1d9843cf-b5cf-11df-8bbb-05ff5efea5c3" text="52. What kind of reaction is shown above?" />
                  </prompt>
                  <input>
                    <OTChoice id="1d9843d0-b5cf-11df-8bbb-05ff5efea5c3" selectionUI="0">
                      <choices>
                        <OTText id="1d9843d1-b5cf-11df-8bbb-05ff5efea5c3" text="synthesis" />
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