Differentiate between a pure substance and a mixture. Give two examples of each
Answers
The word 'pure' is used in chemistry in a different way from its everyday meaning. For example, shops sell cartons labelled as 'pure' orange juice. The label means that the contents are just orange juice, with no other substances added. However, the juice is not pure in the chemical sense because it contains different substances mixed together. In chemistry:
A pure substance consists only of one element or one compound
A mixture consists of two or more different substances, not chemically joined together.
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds. Mixtures can be classified as homogeneous or heterogeneous.
The physical properties of pure substances are definite and constant. Mixtures have varying physical properties. The chemical properties of pure substances are constant and definite too. Mixtures have variable or indefinite chemical properties.
Example of pure substances- Gold, pure water, hydrogen gas
Example of mixture- Oil & water, sand & sugar
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