Chemical substance

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Water and steam are two different forms of the same chemical substance

A chemical substance is any material with a definite chemical composition.^[1] For example, a sample of water has the same properties and the same ratio of hydrogen to oxygen whether the sample came from a river or was made in a laboratory. A pure substance cannot be separated into other substances by any mechanical process.^[2] Typical chemical substances found in the home are water, salt (sodium chloride) and sugar (sucrose). Generally, substances exist as solid, liquid, or gas, and may change between these phases of matter when there is a changes in temperature or pressure.

[change] References

1. ↑ Hill, J. W.; Petrucci, R. H.; McCreary, T. W.; Perry, S. S. General Chemistry, 4th ed., p5, Pearson Prentice Hall, Upper Saddle River, New Jersey, 2005.
2. ↑ Ebbing, D. D.; Gammon, S. D. General Chemistry, 7th ed., p12, Houghton Mifflin, Boston, Massachusetts, 2002.

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