1. If the average kinetic energy of the molecules in a liquid decreases, what is the most likely outcome?
- A. The rate of evaporation will increase.
- B. The liquid will boil more rapidly.
- C. The rate of evaporation will decrease.
- D. The liquid will turn directly into a solid.
2. What is the term for the gaseous form of a substance that is normally a liquid at a given temperature, such as the result of evaporation?
- A. Plasma
- B. Vapor
- C. Aerosol
- D. Condensate
3. Evaporation is a physical process that describes the transition of a substance from which state to another?
- A. A solid directly to a gas
- B. A gas to a liquid
- C. A liquid to a gas at its surface
- D. A liquid to a solid
4. According to the mechanism of evaporation, what is the direct effect of adding solar energy to a liquid?
- A. It causes the molecules to become heavier and sink.
- B. It decreases the attractive forces between the molecules.
- C. It increases the kinetic energy of the molecules, causing them to move faster.
- D. It chemically transforms the liquid into a different substance.
5. For a single molecule at the surface of a liquid to evaporate, what must it achieve?
- A. It must bond with an air molecule.
- B. It must become electrically charged.
- C. It must gain enough speed to overcome intermolecular attractions.
- D. It must be lighter than all other molecules in the liquid.
6. When summer arrives on Titan, the methane lakes receive more direct sunlight. What is the primary effect of this increased solar energy on the methane molecules?
- A. The methane molecules chemically break down into simpler elements.
- B. The average kinetic energy of the methane molecules increases.
- C. The methane molecules begin to freeze and form a solid layer.
- D. The potential energy of the methane molecules is converted to light.
7. The temperature of the liquid methane in Titan's lakes is a measure of what property?
- A. The total chemical energy stored in all the molecular bonds
- B. The overall volume that the liquid methane occupies in the lake
- C. The average kinetic energy of the methane molecules
- D. The density of the liquid methane
8. The energy transferred from the sun that causes the temperature of Titan's methane lakes to rise is best described as what?
- A. Chemical energy
- B. Potential energy
- C. Thermal energy
- D. Nuclear energy
9. The text explains that the sun's energy increases the temperature of Titan's methane lakes. At a molecular level, what does this mean?
- A. The individual methane molecules are getting larger in size.
- B. The bonds holding the methane molecules together are strengthening.
- C. The methane molecules are, on average, moving more rapidly.
- D. The methane molecules are becoming stationary.
10. As sunlight warms Titan's lakes, which energy conversion is taking place?
- A. Kinetic to potential energy
- B. Chemical to thermal energy
- C. Solar energy to thermal energy
- D. Nuclear to kinetic energy