Matter can be classified into two groups:
- Pure substances are made up of a single type of element or compound. For example, gold, iron and salt are pure substances.
- Mixtures are made up of several pure substances. For example, sea water is a mixture which is formed by water and salt.
- Pure substances are made up of a single type of element or compound. For example, gold, iron and salt are pure substances.
- Mixtures are made up of several pure substances. For example, sea water is a mixture which is formed by water and salt.
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