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GCSE Combined Science · key term
A substance containing two or more different elements chemically combined in fixed proportions.
Used by AQA
Specification 5.1.1.1, 5.8.1.1 · Paper 3, Paper 4
Revise: Atoms, Elements, Compounds and Chemical FormulaeBeing comfortable with it means you can move between an element's name and its symbol when reading or naming a compound.
A substance containing atoms of two or more different elements chemically bonded together.
A compound must contain at least two different elements. Having several atoms does not, by itself, make a substance a compound.
Do not describe compounds as impure. A pure substance can be either an element or a compound.
Define chemical purity as a single element or compound with no other substance mixed in. A compound can be pure even though it contains more than one element.
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