Pure Substances and Mixtures

Front

What is a pure substance?

Back

A pure substance is a material with a composition that is always the same, consisting of only one type of particle.

Front

Give an example of a pure substance.

Back

Water (H2O) is an example of a pure substance.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the components are uniformly distributed and cannot be easily distinguished.

Front

Give an example of a homogeneous mixture.

Back

Saltwater is an example of a homogeneous mixture.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the components are not uniformly distributed and can be easily distinguished.

Front

Give an example of a heterogeneous mixture.

Back

Salad is an example of a heterogeneous mixture.

Front

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

Back

A pure substance has a constant composition, while a mixture consists of two or more substances that can vary in composition.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together.

Front

Is air a pure substance?

Back

No, air is a mixture of gases, primarily nitrogen and oxygen.