Chemical and Physical changes

Front

What is a physical property?

Back

A characteristic of a substance that can be observed or measured without changing its identity, such as color, melting point, or boiling point.

Front

What is a chemical property?

Back

A characteristic of a substance that describes its ability to change into different substances, such as flammability or reactivity with acids.

Front

What is matter?

Back

Anything that occupies space and possesses mass.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition, such as freezing or melting.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances, such as rusting or burning.

Front

What is a homogeneous mixture?

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A mixture that has a uniform composition throughout, such as saltwater or air.

Front

What is a heterogeneous mixture?

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A mixture that consists of visibly different substances or phases, such as salad or a mixture of sand and iron filings.

Front

What happens to sugar when it dissolves in water?

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It undergoes a physical change, as the sugar molecules disperse in the water but do not change their chemical structure.

Front

Can a physical change be reversed?

Back

Yes, many physical changes can be reversed, such as freezing and melting.

Front

Can a chemical change be reversed?

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Most chemical changes are not easily reversible, as they result in the formation of new substances.