What is a pure substance?

Answer

A pure substance is a single substance that is free from contamination. Ethanol and honey are examples of pure substances.

Water is a pure substance as long as it has not been contaminated. Hard water is not a pure substance because it has been contaminated by magnesium, calcium and other minerals.

Some educators define a pure substance as one that is made up of only one type of building block. Under this definition, elements and compounds are the only materials that would qualify as pure substances. Although compounds are made up of two or more elements, they are pure substances because their composition never changes.

Q&A Related to "What is a pure substance?"
ok so some examples of pure substances are gold sugar table salt distilled water(pure) iron filings.
http://wiki.answers.com/Q/What_are_3_pure_substanc...
Examples: Table salt (sodium chloride, NaCl) sugar (sucrose, C12H22O11) water
http://www.chacha.com/question/what-a-example-of-a...
i'm not too sure but my currymunching friend daniel said that you suck sh*t and that is the answer.
http://wiki.answers.com/Q/Why_marble_is_pure_subst...
The two categories of pure substances are elements and compounds.
http://www.chacha.com/question/what-are-the-two-ca...
1 Additional Answer
Ask.com Answer for: what is pure substance
A substance is a form of matter that has a constant chemical composition and characteristic properties. It cannot be separated into its several components without breaking its chemical bonds.
Water, gold, table salt and sugar are all substances.
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