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

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 can be separated physically.

Front

Is water a pure substance or a mixture?

Back

Water is a pure substance when it is in its pure form (H2O) without any impurities.

Front

Is air a pure substance or a mixture?

Back

Air is a mixture because it contains various gases like nitrogen, oxygen, carbon dioxide, and others.

Front

What is an example of a homogeneous mixture?

Back

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

Front

What is an example of a heterogeneous mixture?

Back

An example of a heterogeneous mixture is a salad, where the individual ingredients can be seen and separated.

Front

What is a compound?

Back

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

Front

Is Dr. Pepper a pure substance or a mixture?

Back

Dr. Pepper is a mixture because it contains various ingredients and flavors.