Understanding Thermal Energy

What happens to the particles in a substance when its temperature increases?

• They stop moving completely.

• They change into a different state of matter.

• They move faster and collide more.

• They move slower and collide less.

Which of the following is an example of convection?

• Boiling water on the stove.

• Rubbing your hands together to warm them.

• Using a microwave to heat food.

• Roasting marshmallows over an open fire.

How is thermal energy transferred when you rub your hands together?

• Convection

• Conduction

• Radiation

• Evaporation

What is the term for the transfer of thermal energy through electromagnetic waves?

• Conduction

• Radiation

• Reflection

• Convection

What happens to gas particles when they are heated?

• They move closer together.

• They spread out in all directions at high speeds.

• They change into a liquid.

• They stop moving.