6th Science Lesson 2-2 Changes of State Review

How can you increase a substance’s thermal energy?

• You can increase the thermal energy of a substance by changing its molecular structure.
• You can increase the thermal energy of a substance by cooling it down.
• You can increase the thermal energy of a substance by heating it.
• You can increase the thermal energy of a substance by vaporizing the substance.

What happens when a substance is cooled?

• When a substance is cooled, it melts into a solid.
• When a substance is cooled, its thermal energy decreases, its particles slow down, and its temperature decreases.
• When a substance is cooled, it reverses the change of state.
• When a substance is cooled, its thermal energy increase, its particles move faster and its temperature increases.

What is the change in state from a liquid to a solid called?

• Melting
• Vaporization
• Sublimation
• Freezing

What is the change of a liquid to a gas called?

• Melting
• Vaporization
• Sublimation
• Freezing

When does condensation occur?

• Condensation occurs when atmospheric pressure affects how easily a liquid changes to a gas.
• Condensation occurs when particles in a gas lose enough thermal energy to change state.
• Condensation occurs when a substance's thermal energy decreases, its particles slow down, and its temperature decreases.
• Condensation occurs when a liquid boils.

What happens during sublimation?

• During sublimation, particles of a solid do not pass through the liquid state as they form a gas.
• During sublimation, particles of a liquid change into a solid.
• During sublimation, vaporization takes place only on a surface of a liquid.
• During sublimation, vaporization takes place below and and at the surface of a liquid.

What happens when you heat up a substance?

• When you heat up a substance, energy is stored.
• When you heat up a substance, its thermal energy increases, its particles move faster and its temperature increases.
• When you heat up a substance, the reverse of melting occurs.
• When you heat up a substance, the temperature decreases.