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 can be an element or a compound.

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

Give an example of a pure substance.

Back

An example of a pure substance is water (H2O), which is a compound.

Front

Give an example of a mixture.

Back

An example of a mixture is salad, which contains various ingredients that maintain their individual properties.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include oxygen (O) and gold (Au).

Front

What is a compound?

Back

A compound is a pure substance formed when two or more elements chemically combine in fixed proportions. An example is carbon dioxide (CO2).

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition and appearance throughout, such as saltwater.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture that does not have a uniform composition and can be easily separated, such as a salad or a mixture of sand and pebbles.

Front

Is Dr. Pepper a pure substance or a mixture?

Back

Dr. Pepper is a mixture because it contains various ingredients that do not combine chemically.

Front

Is wood a pure substance or a mixture?

Back

Wood is a mixture because it is made up of different compounds and materials.