1. For water vapor in the air to turn into liquid water droplets, what must happen to the vapor?
- A. It must get hotter.
- B. It must lose heat.
- C. It must be exposed to direct sunlight.
- D. It must mix with dust particles in the air.
2. During the process of condensation, what happens to the individual water molecules?
- A. They speed up and spread farther apart.
- B. They break apart into separate atoms.
- C. They slow down and move closer together.
- D. They instantly freeze into a solid crystal pattern.
3. Evaporation is the process of a liquid turning into a gas, like a puddle drying up. Which of the following describes condensation, the opposite process?
- A. An ice cube melting into water.
- B. Water boiling in a pot on the stove.
- C. Dew forming on blades of grass overnight.
- D. Sugar dissolving completely in a glass of water.
4. What is the scientific term for the process when a gas, like water vapor, cools and changes into a liquid?
- A. Evaporation
- B. Condensation
- C. Freezing
- D. Melting
5. On a cold winter day, you can see your breath as a small cloud. This happens because the warm, invisible water vapor from your lungs cools down in the cold air. What is this process called?
- A. Melting
- B. Condensation
- C. Evaporation
- D. Filtration
6. Which of the following best describes the process of condensation?
- A. A solid changing directly into a gas
- B. A gas changing into a liquid
- C. A liquid changing into a gas
- D. A liquid changing into a solid
7. During the process of condensation, what is happening to the water molecules?
- A. They are gaining energy and spreading farther apart.
- B. They are breaking down into individual hydrogen and oxygen atoms.
- C. They are losing energy and clumping closer together.
- D. They are being absorbed into the surface they touch.
8. After a long, hot shower, you notice the bathroom mirror is covered in a thin layer of water, making it look "foggy." What is the scientific explanation for this?
- A. The heat from the shower causes the mirror to sweat out water that was trapped inside the glass.
- B. Steam from the shower is a special type of gas that is naturally sticky and clings to smooth surfaces.
- C. Water vapor from the hot shower cools down when it touches the colder mirror surface, causing it to condense.
- D. The high pressure from the running water forces water particles from the shower directly onto the mirror's surface.
9. Which of these everyday situations is a direct result of condensation?
- A. A puddle of water drying up on a hot sidewalk.
- B. An ice cube melting in a drink.
- C. Dew forming on grass on a cool morning.
- D. Water in a pot turning to steam when it is boiled on the stove.
10. For condensation of water vapor to occur, the water vapor must typically...
- A. be exposed to bright sunlight.
- B. come into contact with a very dry surface.
- C. lose heat energy.
- D. gain a significant amount of kinetic energy from a heat source.