Science Primary 5-6 (Ages 10-12)

Change of State

1) I can identify melting, freezing, evaporation, condensation and boiling. 2) I can describe how thermal energy changes particle motion during a change of state. 3) I can use particle motion to explain what happens when matter gains or loses thermal energy. 4) I can justify a change of state using evidence about thermal energy and particle motion.

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What happens to the particles in a substance when it gains thermal energy?

A They move slower and come closer together.

B They move faster and spread apart.

C They stop moving completely.

D They change into a different type of particle.

Which change of state occurs when a solid gains enough thermal energy to become a liquid?

A Evaporation

B Melting

C Freezing

D Condensation

During freezing, what happens to the thermal energy and particle motion of a substance?

A Thermal energy is released, and particles move faster.

B Thermal energy is released, and particles move slower.

C Thermal energy is absorbed, and particles move slower.

D Thermal energy is absorbed, and particles move faster.

Which of the following best describes evaporation?

A A gas changes into a liquid.

B A liquid changes into a solid.

C A liquid changes into a gas at its surface.

D A solid changes directly into a gas.

What happens to the particles of a gas when it condenses into a liquid?

A They lose thermal energy and move farther apart.

B They gain thermal energy and move closer together.

C They gain thermal energy and move faster.

D They lose thermal energy and move closer together.

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