Chemical substance
A chemical substance is any material with a known chemical composition.[1] For example, water has the same properties and the same ratio of hydrogen to oxygen whether it came from a river or was made in a laboratory. Typical chemical substances found in the home include water, salt (sodium chloride) and bleach. 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.
Gallery
Gray silicon powder, an element. All the other ones are chemical compounds.
White sodium chloride
Pink hydrated (with water) manganese (II) chloride
Brown manganese (II) carbonate
Black copper (II) oxide
Red hydrated (with water) cobalt (II) chloride
Orange potassium dichromate
Yellow sodium chromate
Green hydrated (with water) copper (II) chloride
Blue hydrated (with water) copper(II) sulfate
Purple anhydrous (without water) chromium (III) chloride
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Chemical Substance Media
Steam and liquid water are two different forms of the same pure chemical substance, water.
Colors of a single chemical (Nile red) in different solvents, under visible and UV light, showing how the chemical interacts dynamically with its solvent environment.
Native sulfur crystals. Sulfur occurs naturally as elemental sulfur, in sulfide and sulfate minerals and in hydrogen sulfide.
Potassium ferricyanide is a compound of potassium, iron, carbon and nitrogen; although it contains cyanide anions, it does not release them and is nontoxic.
Chemicals in graduated cylinders and beaker.
Ethanol chemical structure
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.
