What is meant by a substance
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A substance is a pure single form of matter. It cannot be separated into other kinds of matter by any physical process. The substance must be composed of atoms and molecules. The substance must have a particular amount of weight, mass and volume.
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The best examples of pure substances are pure elements, molecules, and compounds:
Hydrogen gas
Gold metal
Sugar (sucrose)
Baking soda (sodium bicarbonate)
Ammonia
Diamond
Copper wire
Silicon chip
Copper sulfate
Ethanol (pure grain alcohol)
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