Chemical Substances

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chemical substance

A material that has a definite chemical composition; may be an element or a chemical compound

chemical reaction

A process that changes some chemical substances into other chemical substances

periodic table

A tabular display of the chemical elements; organized on the basis of their atomic numbers, electron configurations, and chemical properties.

matter

All the substances of which things are made

ion

An atom that has gained or lost at least one electron

mixture

Combination of chemical substances that does not have a fixed composition and does not result from a chemical reaction

organic compounds

Compound found in living organisms; contains mainly carbon

element

Pure substance made up of just one type of atom

atom

The smallest particle of an element that still characterizes the element

chemical compound

Unique substance with a fixed composition that forms when atoms of two or more elements react


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