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- 1. Multiple Choice
The graph shows the temperature of 1kg samples of three materials, A, B, and C, as they are heated. Heating occurs at a constant rate.
If material A starts to melt at 60 oC. At that point, the line on the graph will __________.
continue on as before
begin to curve upward
become steeper
become horizontal
- 2. Multiple Choice
The graph shows the temperature of 1kg samples of three materials, A, B, and C, as they are heated. Heating occurs at a constant rate.
Which material has molecules with the highest average kinetic energy after 40 s of heating?
Material A
Material B
Material C
Impossible to determine from the graph
- 3. Multiple Choice
A 45.0-kg sample of ice is at 0.00 oC. How much heat is needed to melt it? For water Lf =334,000 J/kg and Lv =2.256×106 J/kg.
1.50×104 kJ
4.10×106 kJ
0.00 kJ
1.02×105 kJ
- 4. Multiple Choice
A system consists of an ice cube floating in a glass of water. The entire system is at 0 oC. Thermal energy is then added slowly to the system, causing half of the ice to melt. What can be said about the resulting temperature of the system?
Greater than 0 oC
Less than 0 oC
Equal to 0 oC
Equal to 100 oC
- 5. Multiple Choice
The heat energy required to change 1 kg of a substance from a solid to a liquid state at the same temperature is called ____
specific heat capacity
specific latent heat of vaporization
sensible heat
specific latent heat of fusion
- 6. Multiple Choice
What is the thermal energy removed to convert 0.5 kg of water at 0 oC to ice at 0 oC ?
0 J
1.5 × 105 J
3.0 × 105 J
6.0 × 105 J
- 7. Multiple Choice
Consider the following temperature-time graph when a solid is heated. which part of the graph involves latent heat of vaporization?
Part I
Part II
Part III
Part IV
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