Question

identify each of the phase changes described below. liquid gold is poured into molds and cools to become solid bars. the gold is. liquid nitrogen becomes a gas when it is poured out of its container. the nitrogen is. solid iron is heated to high temperatures so that it becomes a liquid. the iron is. water vapor in the air becomes tiny liquid droplets that form fog. the water is. in a very cold cryogenic freezer, solid oxygen forms on the walls from the oxygen gas in the air. the oxygen is. in the high desert, snow changes to water vapor without becoming liquid water. the snow is.

Explanation:

1. Liquid to solid is called freezing. So when liquid gold cools to become solid bars, it is freezing.
2. Liquid to gas is vaporization. So when liquid nitrogen becomes a gas, it is vaporizing.
3. Solid to liquid is melting. So when solid iron becomes a liquid on heating, it is melting.
4. Gas to liquid is condensation. So when water - vapor becomes tiny liquid droplets (fog), it is condensing.
5. Gas to solid is deposition. So when oxygen gas in the air forms solid oxygen on the walls of a cryogenic freezer, it is depositing.
6. Solid to gas without passing through the liquid state is sublimation. So when snow changes to water - vapor without becoming liquid water, it is sublimating.

Answer:

1. Freezing
2. Vaporizing
3. Melting
4. Condensing
5. Depositing
6. Sublimating