Edexcel GCSE Chemistry · 1CH0
Specification 5.18C · Paper 1
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GCSE Chemistry · key term
The whole number placed before a formula in a balanced equation; it shows the relative number of moles and, for gases under the same conditions, the relative gas volume.
Used by Edexcel and OCR
Specification 5.18C · Paper 1
Specification C5.1j · Paper 2 (Foundation), Paper 4 (Higher)
The large number written before a formula in a balanced equation; it gives the reacting ratio and multiplies the formula's mass contribution.
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