Pure Substances and Mixtures

Front

What is a pure substance?

Back

A pure substance is composed of one single type of matter or element.

Front

What are the two main types of mixtures?

Back

The two main types of mixtures are homogeneous mixtures and heterogeneous mixtures.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that does not have a uniform composition and the different components can be seen.

Front

Can the composition of a pure substance change during a physical change?

Back

No, the composition of a pure substance stays the same during a physical change.

Front

Give an example of a pure substance.

Back

Water is an example of a pure substance.

Front

What is an example of a heterogeneous mixture?

Back

A salad, such as a tomato, lettuce, and corn salad, is an example of a heterogeneous mixture.

Front

What happens to the properties of a substance in a homogeneous mixture?

Back

The properties of the substances in a homogeneous mixture are indistinguishable from one another.

Front

What is the composition of a homogeneous mixture like saltwater?

Back

In a homogeneous mixture like saltwater, the salt is completely dissolved in the water, creating a uniform solution.

Front

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

Back

A mixture contains two or more different substances that are not chemically combined, while a pure substance consists of only one type of matter.