Changes of State Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. What happens to the temperature of a substance while it is melting?
- A. It rises steadily
- B. It falls steadily
- C. It stays constant
- D. It rises then falls
2. How are particles arranged and moving in a gas?
- A. Regularly arranged, vibrating in fixed positions
- B. Randomly arranged, close together, sliding past each other
- C. Randomly arranged, far apart, moving freely at high speed
- D. Regularly arranged, far apart, stationary
3. What is the unit of specific heat capacity?
- A. J/kg
- B. J/kg°C
- C. J/°C
- D. kg/J°C
4. How much energy is needed to raise the temperature of 5 kg of a material with specific heat capacity 900 J/kg°C by 15°C?
- A. 67,500 J
- B. 6,750 J
- C. 13,500 J
- D. 675,000 J
5. A student heats a solid at a constant rate and plots a temperature-time graph. Why does the graph show a flat plateau at the melting point rather than a steady rise?
- A. The heater has switched off automatically
- B. All the energy supplied during this stage is used to break the bonds holding particles in fixed positions, not to increase particle kinetic energy
- C. The thermometer stops working at the melting point
- D. Melting releases energy, cancelling out the heating