Elements, Compounds, and Mixtures

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

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

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non-uniform composition with distinct phases or layers.

Steel is an example of a homogeneous mixture.

Soil is an example of a heterogeneous mixture.

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements.

The chemical formula for ammonia is NH₃.

The chemical formula indicates the types and numbers of atoms present in a compound, providing information about its composition.

A homogeneous mixture.