matter of constant composition best characterized by the entities (molecules, formula units, atoms) it is composed of and characterized by physical properties like density
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A chemical substance is any material with a known chemical composition. 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.
Gray silicon powder, an element. All the other ones are chemical compounds.
White sodium chloride
Orange potassium dichromate
Yellow sodium chromate
- ↑ 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.