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How are chemical compounds different from mixtures?

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Two diagrams show the three-dimensional structure of a methane molecule: panel A uses a ball-and-stick model with a central carbon atom connected to four hydrogen atoms in a tetrahedral arrangement, while panel B illustrates the bond angle of 109.5 degrees and bond length of 1.09 angstroms between carbon and hydrogen atoms. — chemical compound Methane, in which four hydrogen atoms are bound to a single carbon atom, is an example of a basic chemical compound. The structures of chemical compounds are influenced by complex factors, such as bond angles and bond length.

In chemistry, the fundamental difference between a chemical compound and a mixture lies in how their components are combined and how they can be separated.

Chemical Compounds

A chemical compound is a substance composed of identical molecules or ions that consist of atoms of two or more chemical elements joined by chemical bonds. When these elements combine to form a compound, they lose their individual identities, resulting in a product with properties entirely different from those of the constituent elements. For example, the gases hydrogen and oxygen combine to form water, which has distinct properties from either element. Compounds can only be broken down into their constituent elements through chemical reactions, which involve altering the way atoms are bound together.21

Mixtures

A mixture consists of two or more substances that are not chemically combined. Unlike compounds, the components of a mixture retain their individual properties. Mixtures can be separated into their constituent parts using physical processes, such as evaporation, which do not change the chemical structure of the substances involved.312