1. Week 19 1. A material that heats up and cools down quickly
Is useful for storing heat energy.
Has a high specific heat
Is most likely water
Has a low heat capacity.
2. How does a phase diagram indicate when a substance is changing phase?
The temperature rises during a phase change
The temperature is constant during a phase change
The temperature falls during a phase change
The temperature changes 20 C during a phase change

2. 4. In solids, heat transfer occurs by
3. You feel warm when you stand under a heat lamp because energy moves to you by
Conduction. C. Currents.
Convection. D. Radiation.
4. In solids, heat transfer occurs by
Convection
Conduction
Radiation
Insulation

3. 5. When the temperature of a particle rises, there is an increase in the
Size c. Kinetic energy
Potential energy d. Mass
6. How much heat is needed to raise the temperature of 2 kg of copper from 20 ͦC to 30 ͦC? (Specific heat of copper is 390 J/kg ͦC)
15,600 J c. 7,800 J
23,400 J d. 1,950 J

4. 7. A 3kg iron sample requires a 1⁰C change in temperature to gain 390J of heat. What is its specific heat capacity?
1170 J C. 130 J
1170 J/kg ⁰C D. 130 J/kg ⁰C
8. What is the boiling point for the substance in the phase diagram shown below?
30 ͦC
140 ͦC
100 ͦC
70 ͦC

5. 9. The specific heat of pure water is 4. 184 J/g C. A 10
9. The specific heat of pure water is J/g C. A g sample of pure water goes from C. How much heat did the sample gain?
41.84 J c J
418.4 J d J
10. Use the diagram to answer the question. What is the approximate temperature when this substance melts or freezes?
0 C
50 C
-10 C
100 C