Understanding Matter and Its Changes

What happens to the salt when it is stirred into water?

• It disappears completely.

• It remains unchanged at the bottom.

• It changes into a different substance.

• It dissolves and forms a solution.

What is a key characteristic of a mixture?

• The mixture cannot be separated once combined.

• The mixture changes into a new substance.

• The components can be separated and retain their properties.

• The components lose their original properties.

Which of the following is an example of an irreversible change?

• Dissolving sugar in water

• Melting ice

• Burning a marshmallow

• Freezing water

What happens to the mass of water when it changes from solid to liquid to gas?

• The mass remains the same.

• The mass fluctuates randomly.

• The mass increases.

• The mass decreases.

What is the process called when water changes from liquid to gas?

• Condensation

• Sublimation

• Evaporation

• Freezing