Download WS - Heating

Name ____________________________________ Pd __
PRACTICE QUESTIONS
1. Heat flows from a cooler / warmer object to a cooler / warmer object.
2. True or False? Temperature and heat are the same thing.
3. If a hot rock is submerged in cool water, heat will flow until ____________________.
a. the water is hotter than the rock
b. the rock is hotter than the water
c. the rock and the water are the same temperature
4. Ice melts when held in your hand.
This is because the ice releases / absorbs heat causing your skin to feel warmer / cooler.
5. At what temperature does water freeze (if cooling/releasing energy) or melt (if heating/absorbing energy)?
in degrees Celsius?_________
in Kelvin?_________
6. At what temperature does water condense (if cooling/releasing energy) or boil (if heating/absorbing energy)?
in degrees Celsius?_________
in Kelvin?_________
7. During the process of a liquid boiling to a gas, the temperature of the sample ____________________.
a. decreases
b. increases
c. remains constant
o
8. A red balloon is filled with oxygen gas at a temperature of 20 C.
o
A blue balloon is filled with helium gas at a temperature of 100 C.
Which balloon contains the gas particles with the greatest average kinetic energy?
No Way! A back! 
For #9-18, refer to the heating curve below for water as heat is being added at a constant rate.
E
C
B
D
A
9. In section A on the heating curve for water above, what phase (gas, liquid or solid) exists?
10. In section C on the heating curve for water above, what phase (gas, liquid or solid) exists?
11. In section E on the heating curve for water above, what phase (gas, liquid or solid) exists?
12. In which TWO sections does the temperature remain constant?
13. In which TWO sections is heat being converted to potential energy?
14. Which section represents the boiling of water?
15. Which section represents the melting of water?
16. If heat were removed instead of added (cooling), what phase change would be occurring in section D?
17. If heat were removed instead of added (cooling), what phase change would be occurring in section B?
18. Why does the temperature remain constant over sections B and D (during the phase changes)?
a. heat is remaining constant
b. heat is being converted to potential energy
c. heat is directly proportional to kinetic energy
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