Changing a substance’s temperature can cause the substance to change states. These changes occur because adding heat causes the substance’s molecules to move faster and spread out. For example, below 0 degrees Celsius, water takes the form of ice, a solid. Its molecules don’t move very much. Between 0 and 100 degrees Celsius, water is a liquid that you can drink from a glass. Its molecules move around more. When it reaches 100 degrees, it boils and becomes water vapor, a gas. The water molecules move and spread out very quickly into the air.

Question

Based on the passage, molecules of liquid water move

A

faster than molecules of vapor molecules but slower than molecules of ice.

B

faster than molecules of ice but slower than molecules of vapor.

C

slower than molecules of both ice and vapor.

D

just as fast as molecules of water vapor.

Answer 1

B

faster than molecules of ice but slower than molecules of vapor.