Changes of state Quiz
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5 questions, one answer each
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1. Which change of state is a gas turning into a liquid?
- A. Evaporation
- B. Condensation
- C. Sublimation
- D. Melting
2. A heating curve for ice has a flat section at 0 °C. What is happening?
- A. The ice is melting
- B. The water is boiling
- C. The steam is warming up
- D. The ice is getting colder
3. Why does the temperature stay constant while a liquid boils?
- A. The heater stops working
- B. The particles stop moving
- C. The energy is used to overcome the forces between particles
- D. The liquid is losing mass
4. Which process happens only at the surface of a liquid?
- A. Boiling
- B. Sublimation
- C. Freezing
- D. Evaporation
5. What happens to particles in a gas when it condenses?
- A. They gain energy and move apart
- B. They lose energy and the forces pull them together
- C. They turn into a new substance
- D. They stop moving completely