what is pure substance
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A pure substance is any single type of material. A substance can be anything. It doesn't have to consist of a single element or type of molecule.
Example pure hydrogen is a pure substance
Example pure hydrogen is a pure substance
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Chemical substances are often called 'pure' to set them apart from mixtures. A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory. Other chemical substances commonly encountered in pure form are diamond (carbon), gold, table salt (sodium chloride) and refined sugar (sucrose). However, in practice, no substance is entirely pure, and chemical purity is specified according to the intended use of the chemical.
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