Science Grade 7: Thermal Energy Unit Exam Review

Front

What happens to the kinetic energy of particles as the temperature of a substance increases?

Back

It increases.

Front

What is thermal energy?

Back

Thermal energy is the total kinetic energy of particles in a substance, which is related to its temperature.

Front

What is an example of thermal energy in everyday life?

Back

A car engine running.

Front

What effect does increasing temperature have on most materials?

Back

They expand.

Front

What is conduction?

Back

Conduction is the transfer of thermal energy through direct contact between materials.

Front

What is convection?

Back

Convection is the transfer of thermal energy through the movement of fluids (liquids and gases).

Front

What is radiation?

Back

Radiation is the transfer of thermal energy through electromagnetic waves, such as sunlight.

Front

What is a physical change?

Back

A physical change is a change in which the form or appearance of a substance changes, but its chemical composition remains the same.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

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

Back

They generally become less dense.