CHEMISTRY Unit 1.1 (AQA - atoms, elements, compounds)

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7 Terms

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Atom

The smallest part of an element that can exist.

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Chemical symbol

A one- or two-letter representation of an atom of a specific element (for example, OO for oxygen or NaNa for sodium).

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Periodic table

The chart where all approximately 100 known elements are displayed and arranged.

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Compound

A substance containing two or more elements chemically combined in fixed proportions.

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Method required to separate compounds into elements

Chemical reactions only.

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Key characteristics of chemical reactions

They always involve the formation of one or more new substances and frequently involve a detectable energy change.

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Two ways to represent chemical reactions

Word equations or symbol equations using chemical formulae.