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GCSE Chemistry · key term
A mathematical statement showing that two expressions have the same value, written with an equals sign.
Used by OCR
Specification CM2.1iii, CM5.1vi · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Rearranging EquationsAn equation works like a balanced pair of scales. Any operation carried out on one side must also be carried out on the other.
A mathematical statement showing that the expressions on its two sides have the same value.
Perform the same operation on both sides of the equation; do not describe a term as simply ‘moving’ and changing sign.
After rearranging, check your result by substituting simple values into both the original and rearranged equations.
Write the equation you intend to use before substituting any numbers.
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