chemical formula of common compounds
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The symbols of the elements can be used to represent compounds e.g. FeS, NaCl, KBr and H2O. These are called chemical formulae. In the first three examples, the ratio of the elements in each compound is 1:1.
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2.4 Names and formulae of substances (ESAAC)
Compound ion Chloride
Formula Cl−
Compound ion Peroxide
Formula O2−2
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