Phase Changes

Which process happens if enough heat is removed from water?

• Freezing

• Melting

• Boiling

• Condensing

A child took a container of ice cream out of a freezer and placed it on a counter for an hour. Which word equation shows what happened to the ice cream?

• Solid + heat = liquid

• Liquid + heat = gas

• Gas + heat = liquid

• Solid + heat = gas

The temperature of an ice cube is raised from -10 C to 100 C. How does the state of matter change?

• Solid liquid gas

• Solid gas liquid

• Liquid solid gas

• Gas liquid solid

Jill puts her glass of iced tea on the table and goes to make lunch. When she returns, the outside is covered in beads of water. What process is causing this to occur?

• Condensing

• Freezing

• Melting

• Boiling

In a hot shower or steam room, you look up at the ceiling. What do you observe on the ceiling and why?

• Water is on the ceiling due to condensation when water hits the cold ceiling.

• The ceiling remains completely dry because steam does not rise.

• The ceiling changes color due to the heat from the steam.

• The ceiling emits a glow due to the reflection of light from the steam.

If heat is absorbed by ice, what phase change occurs?

• Solid to liquid.

• Liquid to gas.

• Gas to solid.

• Liquid to solid.

To change liquid water into ice cubes you MUST?

• decrease the temperature.

• increase the temperature.

• add salt to the water.

• stir the water continuously.

What explanation can Ben give for what is taking place on the surface of his glass of water?

• The water vapor in the air close to the glass has cooled and condensed.

• The glass is absorbing moisture from the air.

• The water in the glass is evaporating rapidly.

• The glass is leaking water onto its surface.

What happens when liquid water is heated?

• The water will evaporate creating steam.

• The water will freeze into ice.

• The water will turn into a solid.

• The water will become colder.

What statement BEST describes a gas?

• Gases have variable shape and variable volume

• Gases have definite shape and variable volume

• Gases have variable shape and definite volume

• Gases have definite shape and definite volume