#2 Mixtures and Pure Substances

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that can be separated by physical means.

Front

What is a pure substance?

Back

A pure substance is a material made of only one kind of particle, having definite physical and chemical properties.

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 substance formed when two or more elements are chemically bonded together.

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 evenly distributed and cannot be easily distinguished.

Front

What is an example of a heterogeneous mixture?

Back

Chex mix, which contains pretzels, rye chips, and chex cereal.

Front

What is an example of a homogeneous mixture?

Back

Saltwater, where the salt is evenly dissolved in the water.

Front

What distinguishes a molecule from an element?

Back

A molecule is made of two or more different elements, while an element consists of only one type of atom.

Front

What is the melting point?

Back

The melting point is the temperature at which a solid becomes a liquid.