Practice 10C (modified)
1. A 10.0 kg piece of aluminum is heat from 22.0oC to 35oC. How much heat was absorbed
by this piece of aluminum? (Answer: 1.17 x 105 J)
2. By how much does 0.125 kg of water increase in temperature if 1.00 kJ of heat is
absorbed by the water? (Answer: 1.91oC)
3. A hot, just-minted copper coin is placed in 101 g of water to cool. The water temperature
changes by 8.39°C and the temperature of the coin changes by 68.0°C.What is the mass
of the coin? Disregard any energy transfer to the water’s surroundings. (Answer: 0.135
kg, or 135 g)
4. Brass is an alloy made from copper and zinc. A 0.59 kg brass sample at 98.0°C is
dropped into 2.80 kg of water at 5.0°C. If the equilibrium temperature is 6.8°C, what is
the specific heat capacity of brass? (Answer: 390 J/kg°C)
5. What is the final temperature when a 3.0 kg gold bar at 99°C is dropped into 0.22 kg of
water at 25°C? (Answer: 47°C)
6. What is the final temperature when 0.032 kg of milk at 11°C is added to 0.16 kg of coffee
at 91°C? Assume the specific heat capacities of the two liquids are the same as water, and
disregard any energy transfer to the liquids’ surroundings. (Answer: 79°C)