Atoms: Phase Changes

What happens at the boiling point of a substance?

• liquid becomes a gas

• solid becomes a gas

• liquid becomes a solid

• solid becomes a liquid

What are the three common states of matter?

• liquid, gas, vapor

• gas, liquid, fluid

• solid, gas, liquid

• solid, vapor, liquid

True or False: A ring of pure solid gold has atoms that do not move.

• True

• False

When water is changed from liquid to gas what occurs?

• The atoms lose electrons

• A new compound is formed

• Molecules spread farther apart

• Hydrogen is separated from oxygen

In which two parts of the water cycle does water absorb energy?

• condensation and evaporation

• precipitation and condensation

• melting and evaporation

• evaporation and precipitation

The metal lid on a glass jar is hard to open, so it is held under warm water. What causes the lid to open?

• The water increased the pressure under the lid.

• The jar shrunk with the warm water.

• The water acted as a lubricant between the glass and the metal.

• The metal lid expanded under the warm water.

According to the graph, from which points did water evaporate?

• A to C

• D to E

• C to D

• E to F

According to the graph, between which points would water freeze?

• D to C

• B to A

• C to B

• E to D

According to the graph, which points indicate water is a liquid?

• A to B

• B to C

• D to E

• C to D

What action should have caused this change in atomic movement?

• The substance was placed in an ice bath.

• The substance was put into a centrifuge.

• The substance was heated with a Bunsen burner.

• The substance had nitrogen added to it.