Page 85 - Science Course 1 (Book 2)
P. 85
Mo8-L6: Key Concept Check
Direction: Put a check mark on the line beside the true statement.
1. A. Metals are better thermal conductors than nonmetals.
B. Nonmetals are better thermal conductors than metals.
2. A. The specif c heat of water is particularly high.
B. The specif c heat of water is particularly low.
3. A. Thermal expansion and contraction are most noticeable in solids, less noticeable in liquids,
and least noticeable in gases.
B. Thermal expansion and contraction are most noticeable in gases, less noticeable in liquids,
and least noticeable in solids.
4. A. The gaps between sections of a sidewalk leave room for the sidewalk to decrease in
volume.
B. The gaps between sections of a sidewalk leave room for the sidewalk to increase
in volume.
5. A. A burner heats the air in a hot-air balloon, causing thermal expansion.
B. A burner heats the air in a hot-air balloon, causing thermal contraction.
6. A. Ovenproof glass is designed to expand more than ordinary glass when it is heated, which
means it usually does not crack when it is heated.
B. Ovenproof glass is designed to expand less than ordinary glass when it is heated, which
means it usually does not crack when it is heated.
7. A. When water is heated, its temperature increases, its density decreases, and the heated
water rises.
B. When water is heated, its temperature increases, its density decreases, and the heated
water sinks.
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