8. What happens to the temperature while water is in the process of freezing? a. The temperature continues to decrease while freezing occurs. b. The temperature continues to increase while freezing occurs. c. The temperature stays constant while freezing occurs. The removal of energy is used to form bonds between the water molecules. 9. Does the temperature change while phase changes are occurring? Why or why not? a. Yes. The energy is used to decrease the temperature. b. No. The energy is used to break the bonds (overcome intermolecular forces) to cause a phase change. c. Yes. The energy is not used to break the bonds of a solid. d. Yes. The energy is used to boil the substance. 10. How is temperature related to the motion of molecules? a. The molecules move faster with an increase in temperature. b. The molecules move slower with an increase in temperature. c. Temperature is not related to the motion of molecules 11. How do the molecules in the liquid interact with the molecules in the solid? a. The molecules in the liquid do not interact with the molecules in the solid. b. A phase change occurs, but not due to an interaction with the liquid and solid water molecules. c. The collisions of the liquid water molecules transfers energy by direct contact (conduction) to the solid ice. This overcomes the intermolecular forces (breaks bonds) and causes the phase change of melting to occur. d. None of the above.

Question

8. What happens to the temperature while water is in the process of freezing? a. The temperature continues to decrease while freezing occurs. b. The temperature continues to increase while freezing occurs. c. The temperature stays constant while freezing occurs. The removal of energy is used to form bonds between the water molecules. 9. Does the temperature change while phase changes are occurring? Why or why not? a. Yes. The energy is used to decrease the temperature. b. No. The energy is used to break the bonds (overcome intermolecular forces) to cause a phase change. c. Yes. The energy is not used to break the bonds of a solid. d. Yes. The energy is used to boil the substance. 10. How is temperature related to the motion of molecules? a. The molecules move faster with an increase in temperature. b. The molecules move slower with an increase in temperature. c. Temperature is not related to the motion of molecules 11. How do the molecules in the liquid interact with the molecules in the solid? a. The molecules in the liquid do not interact with the molecules in the solid. b. A phase change occurs, but not due to an interaction with the liquid and solid water molecules. c. The collisions of the liquid water molecules transfers energy by direct contact (conduction) to the solid ice. This overcomes the intermolecular forces (breaks bonds) and causes the phase change of melting to occur. d. None of the above.

Answer 1

8. c9. b10. a11. c

Answer 2

## Step1For question 8, we need to understand what happens to the temperature of water during the freezing process. The freezing process is an exothermic process, which means it releases energy. This energy is used to form bonds between the water molecules, which is why the temperature remains constant during this process.## Step2For question 9, we need to understand whether the temperature changes during phase changes. During a phase change, the temperature remains constant because the energy is used to break the bonds between the molecules, not to increase the temperature.## Step3For question 10, we need to understand the relationship between temperature and the motion of molecules. As the temperature increases, the molecules move faster. This is because temperature is a measure of the average kinetic energy of the molecules, and kinetic energy is directly related to the speed of the molecules.## Step4For question 11, we need to understand how molecules in a liquid interact with molecules in a solid. When a liquid is in contact with a solid, the molecules in the liquid transfer energy to the molecules in the solid through direct contact (conduction). This energy transfer breaks the bonds between the molecules in the solid, causing the phase change of melting to occur.

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