Thermal Energy

What happens when a cold drink sits in a hot room?

• It remains cold

• It gets warmer

• It starts boiling

• It starts to freeze

Which of the following best describes temperature?

• Number of molecules

• Motion of molecules

• Size of molecules

• Type of molecules

When two things are the same temperature:

• They have the same number of molecules

• Their molecules stop moving

• Their molecules move at the same average speed

• Heat transfer between the two things stops

When you heat a pot on a stove, the handle gets warm. Which type of heat transfer is responsible?

• Conduction

• Radiation

• Convection

• All of the above

List the following particles in size order, from biggest to smallest?

• Molecules, electrons, atoms

• Atoms, molecules, electrons

• Electrons, atoms, molecules

• Molecules, atoms, electrons

Convection currents occur:

• Only in liquids

• When a dense substance is warmer than a less dense substance

• In both liquids and gases

• Weakly in solids

As particles are exposed to warmer temperatures they __________

• speed up

• slow down

• stay the same

• vibrate at fixed positions

As particles are exposed to colder temperatures they _____

• speed up
• slow down
• stay the same
• become ions

True or False

Matter cannot be created or destroyed.

• True

• False

Particles in a _____________ are tightly packed together.

• solid
• liquid
• gas
• plasma