Materials can be classified as either elements, compounds or mixtures. An element is the purest form of a substance and cannot be further sub-divided into different or non-identical materials. A compound is made up of two or more elements combined together in a certain fixed ratio. It can be sub-divided into its constituents chemically. A mixture is composed of two or more compounds and can be sub-divided into its constituents by physical methods.
Some examples of elements include iron, aluminum, sodium, gold, silver, uranium, etc. Some examples of compounds include water (H2O), carbon dioxide (CO2), glucose (C6H12O6), methane (CH4), etc. Some examples of mixtures include trail-mix, mixed salad, etc.
A solution is formed by mixing a solute into a solvent. For example, mixing sugar (solute) in water (solvent) forms sugar water solution. Similarly, saline water solution can be prepared by mixing salt with water.
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