2. Give an example of a substance changing temperature and what happens to the motion of molecules as the temperature changes?

Example 1:

What happens when I blow hot air on the balloon? Why?

What is happening to the air inside the balloon?

What do you think would happen if the balloon was placed in a cold car?

What would happen to the balloon as the temperature increases in the car? Why?

Ask the students to think about what might happen to a balloon in a bottle when it is heated.

Example 2:

Water is placed in the freezer.

Ice melts.

A puddle evaporates.