Question
Gases can be compressed, but liquids cannot.
Which statement explains this difference?
A. Each molecule in a gas is more compressible than each molecule in a liquid.
B. Molecules in a gas are further apart than molecules in a liquid.
C. Molecules in a gas attract each other more strongly than molecules in a liquid.
D. Molecules in a gas move more slowly than molecules in a liquid.
Answer/Explanation
Ans: B
Question
At –39 °C, liquid mercury solidifies without a change of temperature.
Which row shows whether the mercury absorbs or releases energy and what happens to the
bonds between the mercury atoms?
| energy | bonds between atoms |
A | absorbed | stronger |
B | absorbed | weaker |
C | released | stronger |
D | released | weaker |
Answer/Explanation
Ans: C
Question
Two states of matter are described as follows.
In state 1, the molecules are very far apart. They move about very quickly at random in straight
lines until they hit something.
In state 2, the molecules are quite closely packed together. They move about at random. They do
not have fixed positions.
What is state 1 and what is state 2?
| state 1 | state 2 |
A | gas | liquid |
B | gas | solid |
C | liquid | gas |
D | solid | liquid |
Answer/Explanation
Ans: A