Lots of fun!
Win valuable prizes!
1. In an air-conditioned house, double glass windows
and fiberglass insulation both have a similar ability to
transmit heat. These substances serve to
A. prevent heat transfer due to their high thermal
conductivity.
B. allow heat transfer due to their high thermal
conductivity.
C. prevent heat transfer due to their low thermal
conductivity.
D. allow heat transfer due to their low thermal
conductivity.
2.
3400 J of heat is added to 2.9 kg of lead. What is its
change in temperature? (The specific heat capacity of
lead is 128 J/kg·°C.)
3. Two 8-kg samples of water are mixed. If the first has a
temperature of 25°C and the second has a temperature
of 71°C, what is the final temp after they are mixed?
4. A calorie is a unit of energy equal to 4.186 J. What is
the specific heat capacity of water in cal/g·°C?
5. The reason you can hold your fingers beside a candle
flame without getting hurt is that
A. air convects heat well.
B. hot air rises.
C. air is a poor heat conductor.
D. hot-air convection currents travel upward.
E. all of the above
6. How much heat is absorbed converting 2.3 kg of ice at
0oC to water at 0oC? (The Latent heat of fusion of
water is 3.33 × 105 J/kg.)
7. A piece of metal will feel colder than a piece of wood
at the same temperature. Why?
A. Metals, in general, have a higher specific heat
capacity than wood.
B. Metals, in general, are good heat conductors.
C. Metals are colder than wood.
D. Wood, in general, is a poor insulator.
E. Metal atoms are moving more slowly, on the average,
than wood atoms.
8. How much heat is required to change 6.20 kg of water
at 90.0oC to steam at 113oC?
(The specific heat capacity of water is 4186 J/kg·°C. The
latent heat of vaporization of water is 2.26 × 106 J/kg.
The specific heat capacity of steam is 2010 J/kg·°C. )
9. To say that evaporation is a cooling process means
that when evaporation occurs,
A. the remaining liquid cools.
B. the evaporating vapor cools.
C. both A and B.
D. none of the above
10. When water freezes, it
A. absorbs energy.
B. gives off energy.
C. neither gives off nor absorbs energy.
Bonus question time!
 After your team hears its score, decide how much to
wager on the bonus question. Write it on a slip of
paper and give it to Mr. Maley.
Bonus question
22 kg of copper at 145oC is dropped into 16 kg of water at
23oC. What is the final temperature of the two
substances after they reach thermal equilibrium?
(The specific heat capacity of copper is 387 J/kg·°C. The
specific heat capacity of water is 4186 J/kg·°C.)