Pure Substances and Mixtures

Front

What is a pure substance?

Back

A material that has a constant composition and cannot be separated into other materials by physical means.

Front

Give an example of a pure substance.

Back

Carbon dioxide.

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What is a solution?

Back

A mixture where the components are uniformly distributed.

Front

What is a heterogeneous mixture?

Back

A mixture where the components are not uniformly distributed and can be easily distinguished.

Front

Give an example of a heterogeneous mixture.

Back

Sand and gravel.

Front

What is a homogeneous mixture?

Back

A mixture that has a uniform composition throughout.

Front

Give an example of a homogeneous mixture.

Back

Saltwater.

Front

What is the difference between a pure substance and a mixture?

Back

A pure substance has a fixed composition, while a mixture contains two or more substances that can vary in composition.

Front

Which of the following is NOT a pure substance: Gold, Oxygen, Saltwater, Carbon dioxide?

Back

Saltwater.