Pure Substances and Mixtures

Front

What is a pure substance?

Back

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

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that retain their individual properties.

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

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 pure substance.

Back

Water is an example of a pure substance.

Front

What happens to the composition of pure substances during a physical change?

Back

The composition of pure substances stays the same during a physical change.

Front

What type of mixture is a salad made of tomato, lettuce, and corn?

Back

A salad made of tomato, lettuce, and corn is a heterogeneous mixture.

Front

What type of mixture is saltwater?

Back

Saltwater is a homogeneous mixture.

Front

What are the two main categories of mixtures?

Back

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

Front

Can pure substances be separated into simpler substances by physical means?

Back

No, pure substances cannot be separated into simpler substances by physical means.