Chemical substance
A chemical substance is any material with a known 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. Typical chemical substances found in the home include water and salt (sodium chloride). Generally, substances exist as a solid, a liquid, or a gas, and may change between these phases of matter when there are changes in temperature or pressure.
[change] Gallery
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Gray silicon powder, an element. All the other ones are chemical compounds.
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White sodium chloride
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Pink hydrated (with water) manganese(II) chloride
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Brown manganese(II) carbonate
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Black copper(II) oxide
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Red hydrated (with water) cobalt(II) chloride
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Orange potassium dichromate
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Yellow sodium chromate
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Green hydrated (with water) copper(II) chloride
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Blue hydrated (with water) copper(II) sulfate
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Purple anhydrous (without water) chromium(III) chloride
_chloride_tetrahydrate.jpg)
-carbonate-sample.jpg)
-chloride-hexahydrate-sample.jpg)
_chloride_dihydrate.jpg)
-chloride-purple-anhydrous.jpg)
[change] References
- ↑ 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.
