WHAT IS A SUBSTANCE?
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A material which is made up of a particular kind is called a substance.
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It has mass and occupies space.
e.g.: chemical substances and other substances like salt, pure water, iron filings, etc.
Mixture:
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A mixture is a material of two or more different substances which retain their chemical properties.
e.g.: Soil is a mixture of clay, stones, plant & animal remains.