Classify the following as pure substances and mixtures
Distilled Water, Air, Copper wire, Helium gas, Soda water, Vegetable Salad, Pure Gold,
Brass, Calcium carbonate, Lemon juice
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Pure water always consists of two hydrogen and one oxygen atom. These atoms are chemically bonded to each other. Also pure gold consists of gold atoms only. Table salt (sodium chloride) cannot be separated by physical means and has a constant chemical composition. Hence, all the above examples are pure substances.
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all the above substances are pure
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