Why do we need pure substances?

Dear student. Pure substances are those substances which are composed of the same type of particles or molecules. They can be further classified as Elements or Compounds. Example of pure substances are:gold, silver, copper, water etc. We need pure substances because they are required in many ways around us, like copper in wires and coils, water to drink and gold, silver in ornaments etc. Regards

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We need pure substances to: Measure accurate properties of the substance. Carry out chemical reactions without side effects of impurities. Use drugs for medical use without interference from impurities.
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