Heat Review
• How many calories of heat will need to be
added to a 200 g sample of water to raise its
temperature 30°C?
• Randy has a 500 g of water at 20°C. If he
wants the final temperature of the water to be
75°C, how many Joules of heat will he need to
add?
• The element hydrogen has the highest specific
heat of all elements. Hydrogen’s specific heat
capacity is 14300J/(kg K). If the temperature
of a .34kg sample of hydrogen is to be raised
by 25 K, how much heat will have to be
transferred to the hydrogen?
• Radon’s specific heat capacity is 94J/(kg K). If
the temperature of a .34kg sample of radon is
to be raised by 25K, how much heat will have
to be transferred to the radon?
Harry has a 50 g lump of unknown material. He
experiments with the material and determines
that the temperature of the substance increases
by 6°C when 20 cal of heat are added. What is
the substance’s specific heat?
• A .59 kg brass candlestick has an initial
temperature of 98.0°C. If 21,100J of heat is
removed from the candlestick to lower its
temperature to 6.8°C, what is the specific heat
capacity of brass?
• Mercury has one of the lowest specific heat
capacities. If 257J of heat are added to .45 kg
of mercury, the mercury’s temperature will
increase by 4.09K. What is the specific heat
capacity of mercury?
• A .38kg drinking glass is filled with a hot liquid.
The liquid transfers 7032J of heat to the glass.
If the temperature of the glass increases by
22K, what is the specific heat capacity of the
glass?
• The specific heat capacity of glass is 0.20
cal/(g°C). If 30 cal of heat are added to an
unknown mass of glass, the temperature
raises by 150°C. What is mass of the glass?
• What mass of water will give up 240 calories
when its temperature drops from 80°C to
68°C.
• If 216 J of energy is required to raise the
temperature of aluminum from 15°C to 35°C,
calculate the mass of aluminum. (specific heat
of aluminum is 0.90 J/( g°C)
• The temperature of air in a foundry increases
when molten metals cool and solidify.
Suppose 9,900,000J of heat is added to the
surrounding air by the solidifying metal. The
air’s temperature increases by 55K, and the air
has a specific heat capacity of 1000J/(kg K).
What is the mass of the heated air?
• 50 Joules of heat are added to a 2 kg block of
iron. If the specific heat of iron is 452 J/(kg°C),
how much will its temperature change?
• A 30 g piece of iron is dropped into a
container of water and gives off 165 calories in
cooling. Calculate the iron’s temperature
change. (the specific heat capacity of iron is
0.11 cal/( g°C)
• The initial temperature of 150 g of ethanol
was 22°C. What would be the final
temperature of the ethanol if 3,240 J of
energy were added? The specific heat capacity
of ethanol is 2.44 J/ (g°C).