Expand/Contract Conductor/Insulator Review

Front

What happens to the molecules when ice cubes melt?

Back

They move faster.

Front

What is the purpose of narrow gaps between railroad tracks?

Back

To allow for the metal rails to expand and contract when the temperature changes.

Front

Why is hot soup still hot in a thermos after 6 hours?

Back

Because the thermos is made of insulating material that does not transfer heat well.

Front

What happens to the molecules when the air above a heater rises?

Back

They move faster.

Front

How do molecules move when something is cooled?

Back

They move slower.

Front

What is a conductor?

Back

A material that allows heat or electricity to pass through it easily.

Front

What is an insulator?

Back

A material that does not allow heat or electricity to pass through it easily.

Front

Give an example of a good conductor.

Back

Copper.

Front

Give an example of a good insulator.

Back

Rubber.

Front

What happens to the volume of most materials when they are heated?

Back

They expand.