Heat changes

A student pours water in a glass beaker and heats it on a hot plate. What change will occur as the water continues to heat? The water will change from a —

• gas to liquid
• liquid to solid
• solid to liquid
• liquid to gas

A student dropped several ice cubes into a glass of room temperature water. The ice cubes melted because they -

• received thermal energy from water
• all have the same size and shape
• were only in the water for a short time
• could all float on top of the water

After taking a shower, a student observed water droplets condensing on the bathroom mirror. Water condenses on the mirror because the mirror -

• reflects light energy
• is cooler than the air
• is a large, flat solid
• can easily be removed

On what kind of day will ice most likely melt quickly?

• a hot, sunny day
• a cold, snowy day
• a warm, rainy day
• a cool, clear day

To change from a solid to a liquid

• predict
• cool
• change
• melt

To forecast what you think will happen

• predict
• cool
• change
• melt

To become colder

• predict
• cool
• change
• melt

To become altered in some way

• predict
• cool
• change
• melt

Which of the following will cause an ice cube to melt? 

• covering the ice cube with aluminum foil
• adding thermal energy to the ice cube
• putting the ice cube in a dark place
• returning the ice cube to the freezer

On a hot, summer day, water droplets often form on the outside of a cold glass of water. The water droplets form when water vapor in the air

• loses heat on the cold glass
• reacts with the chemicals in the air
• gains energy from sunlight
• is moved about quickly by wind