Heating and cooling curves and latent heat Quiz
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5 questions, one answer each
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1. What happens to the temperature of a substance while it melts at a steady heating rate?
- A. It stays constant
- B. It rises quickly
- C. It falls
- D. It rises slowly
2. How much energy is needed to boil away 0.10 kg of water at 100 °C? (specific latent heat of vaporisation 2 260 000 J/kg)
- A. 22 600 J
- B. 226 000 J
- C. 2 260 J
- D. 22 600 000 J
3. Which statement about boiling and evaporation is correct?
- A. Evaporation happens only at 100 °C
- B. Boiling happens at any temperature
- C. Evaporation happens only at the surface, but boiling happens throughout the liquid
- D. Both only happen at the surface
4. Why does sweating cool the body?
- A. Sweat is always colder than the skin
- B. Evaporation releases energy to the skin
- C. Sweat condenses on the skin
- D. The fastest particles evaporate, lowering the average kinetic energy of the rest
5. Which would speed up the evaporation of water from a puddle?
- A. Cool, humid air
- B. A warm, dry wind
- C. Still air
- D. A smaller surface area