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A mixture is made of two or more chemical substances that are combined but not chemically bonded to each another.

Separating substances in a mixture does not require breaking chemical bonds.

Salt water is just a mixture of salt ($$\ce{NaCl}$$) and water ($$\ce{H2O}$$). The salt can be retrieved by boiling off the water.

The substances in a mixture can be added together in any proportion. This differs from compounds, where the components are always present in a fixed proportion.

Mixing water and salt in any proportion will still give salt water.

Combining two hydrogen atoms to two oxygen atoms will not give water ($$\ce{H2O}$$). Another compound will be formed instead ($$\ce{H2O2}$$ in this case).

Mixture Compound
Can contain different elements or compounds Consists of atoms of two or more elements, chemically combined together
Components can be present in any proportion Components are present in a fixed ratio
Components are separated by physical methods (e.g. filtration, distillation) Components are separated by chemical methods (e.g. electrolysis, decomposition)