Exploring Physical State Changes

What is the process called when a solid changes into a liquid?

• Freezing

• Melting

• Condensation

• Evaporation

Which of the following is an example of a granular solid?

• Water

• Sugar

• Steam

• Milk

What happens to the particles of a substance when it changes from a liquid to a gas?

• They move closer together

• They move further apart

• They stop moving

• They become larger

Explain why ice melts when left at room temperature. Use evidence from what you know about temperature and state changes.

• Ice absorbs heat, causing its temperature to rise and change into water.

• Ice releases cold, causing it to turn into water.

• Ice remains the same because room temperature is too low.

• Ice turns into gas directly at room temperature.

Which process describes the change from gas to liquid?

• Freezing

• Melting

• Condensation

• Sublimation

Why does salt remain a solid even though it is made up of tiny particles?

• Because it is dissolved in water

• Because it is a granular solid

• Because it is a liquid at room temperature

• Because it is a gas

Describe a real-world example where a liquid changes into a gas and explain the process.

• Water boiling on a stove turns into steam as it absorbs heat.

• Ice cream melting in the sun turns into a liquid.

• Salt dissolving in water.

• Sand being blown by the wind.

What is the term for the change of state from liquid to solid?

• Melting

• Freezing

• Evaporation

• Condensation

How does temperature affect the state of matter of a substance?

• Higher temperatures always turn substances into solids.

• Lower temperatures always turn substances into gases.

• Temperature changes can cause substances to change between solid, liquid, and gas states.

• Temperature has no effect on the state of matter.

Predict what would happen to a block of ice if it were placed in a warm room. Explain your reasoning.

• It would melt into water because the warm temperature provides heat energy.

• It would freeze further because the room is warm.

• It would turn into gas immediately.

• It would remain unchanged.