Pure Substances vs Mixtures

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. It cannot be separated into other substances by physical means.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties. Mixtures can be homogeneous or heterogeneous.

Front

Define homogeneous mixture.

Back

A homogeneous mixture is a mixture that has a uniform composition and appearance throughout. The individual components are not distinguishable.

Front

Define heterogeneous mixture.

Back

A heterogeneous mixture is a mixture where the individual components are distinguishable and not uniformly distributed.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a compound?

Back

A compound is a pure substance formed when two or more elements are chemically combined in a fixed ratio.

Front

Give an example of a homogeneous mixture.

Back

An example of a homogeneous mixture is saltwater, where the salt is completely dissolved in water.

Front

Give an example of a heterogeneous mixture.

Back

An example of a heterogeneous mixture is chicken noodle soup, where the ingredients can be seen and separated.

Front

What happens to the properties of elements when they form a compound?

Back

The properties of a compound are different from the properties of the individual elements that make it up.

Front

Is saltwater a mixture or a compound?

Back

Saltwater is a mixture.