If distilled water is made up of Hydrogen and Oxygen, than how is it a pure substance? (no jokes)
by 
lucas6
ANSWERS: 4
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It doesn't have other elements dissolved in it,like minerals,iron etc
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if the substance you want is water and you want it to be pure then what you want is the chemical make of hydrogen and oxygen with nothing else in it
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There is nothing in the definition of the word "substance" that requires the a pure substance be made up of just one element. A pure substance could also be made up of a single compound.
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I think you are confusing a substance and an element. Water is a substance made up of bonded hydrogen and oxygen. Distilled water is pure because it contains nothing but water molecules. It is immaterial what elements are in the molecules, the substance is pure because all the molecules are the same.
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