Physical and Chemical Changes Quiz

What is a physical change? Give two examples.

• A change in the chemical composition of a substance.

• A change in the form or appearance of a substance without changing its chemical composition.

• A change that creates a new substance.

• A change that involves a chemical reaction.

How can you separate a mixture of sand and iron filings?

• Use water to dissolve the iron filings.

• Use a magnet to attract the iron filings, leaving the sand behind.

• Use a filter to separate the sand from the iron filings.

• Use heat to melt the sand.

What happens when salt dissolves in water? Does this change its chemical composition?

• Salt dissolves by changing its chemical composition.

• Salt dissolves by breaking into smaller particles without changing its chemical composition.

• Salt does not dissolve in water.

• Salt changes into a new substance when dissolved.

Compare and contrast mixing sand with water versus mixing salt with water. How do their physical changes differ?

• Both sand and salt dissolve completely in water.

• Sand dissolves in water, but salt does not.

• Sand does not dissolve and settles at the bottom, while salt dissolves completely.

• Both sand and salt settle at the bottom of the water.

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If you freeze water into ice and then melt it back into water, how do the properties of the substance change or stay the same?

• The chemical composition of water changes.

• The state of matter changes, but the chemical composition remains the same.

• The water becomes a new substance.

• The water loses its original properties.

How can filtration and evaporation be used to separate a mixture of salt and water?

• Filtration can separate dissolved salt from water.

• Evaporation can be used to retrieve the salt by heating the saltwater until the water evaporates.

• Filtration and evaporation cannot separate salt from water.

• Filtration is used to evaporate the water.

What are the three states of water?

• Solid, Liquid, Gas

• Ice, Steam, Vapor

• Water, Ice, Snow

• Liquid, Vapor, Mist

What happens to water when it is heated?

• It freezes

• It evaporates

• It condenses

• It melts

What happens to water when it is cooled below 0°C?

• It boils

• It evaporates

• It freezes

• It condenses

What is the term for when a gas turns back into a liquid?

• Evaporation

• Freezing

• Condensation

• Melting