1. The freezing point of water is 0^oC. Its melting point is what?

 

a. slightly less than 0^oC

b. 0^oC

c. slightly more than 0^oC

d. 32^oC

 

Answer: _____

 

 

2. When a vapor condenses into a liquid, _____________________________.

 

a. it absorbs heat

b. it gives off heat

c. its temperature rises

d. its temperature drops

 

Answer: _____

 

 

3. The heat of vaporization of a substance ____________________________.

 

a. is less than its heat of fusion

b. is equal to its heat of fusion

c. is greater than its heat of fusion

d. depends on the nature of the substance

 

Answer: _____

 

 

4. The heat given off by 600 grams of an alloy as it cools through 80^oC raises the temperature of 400 grams of water from 15^oC to 55^oC. What is the specific heat of the alloy?

 

a. 1280 J/(kg C^o)

b. 1400 J/(kg C^o)

c. 1480 J/(kg C^o)

d. 1520 J/(kg C^o)

e. 1670 J/(kg C^o)

 

Answer: _____

 

 

5. The specific heat of lead is 128 J/(kg C^o). Suppose that 300 grams of lead shot at 100^oC is mixed with 200 grams of water at 0^oC in an insulated container. What is the final temperature of the mixture?

 

a. 2.10^oC

b. 3.25^oC

c. 4.39^oC

d. 5.94^oC

e. 12.0^oC

 

Answer: _____

 

 

6. What is the specific heat of a 20 g object if its temperature increases by 5^oC when 20 calories of heat are transferred to it?

 

a. 0.200 cal/(g C^o)

b. 0.400 cal/(g C^o)

c. 0.600 cal/(g C^o)

d. 0.850 cal/(g C^o)

 

Answer: _____

 

 

7. A block of ice at 0^oC is added to a 150 g aluminum calorimeter cup that holds 200 g of water at 10^oC. If all but 2 g of ice melt, what was the original mass of the block of ice? (The specific heat capacity of aluminum is 0.215 cal/(g C^o).)

 

a. 31.1 g

b. 38.8 g

c. 42.0 g

d. 47.6 g

 

Answer: _____

 

 

8. The temperature of an object is a measure of the ___________________________________.

 

a. rate at which the object can absorb heat

b. rate at which the object will expand

c. thermal conductivity of the object

d. thermal stress being applied to the object

e. average kinetic energy of the atoms or molecules in the substance of which the object is formed

 

Answer: _____

 

 

9. Find the mass of water at 10^oC that must be added to 300 kg of water at 50^oC to lower its temperature to 40^oC.

 

a. 50 kg

b. 100 kg

c. 200 kg

d. 300 kg

e. 900 kg

 

Answer: _____

 

 

10. A 200 g metal object requires 502 Joules of heat to raise its temperature from 20^oC to 40^oC. The specific heat capacity of the metal is what?

 

a. 63 J/(kg C^o)

b. 126 J/(kg C^o)

c. 251 J/(kg C^o)

d. 502 J/(kg C^o)

 

Answer: _____