OCR GCSE Chemistry B · J258
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
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GCSE Chemistry · key term
The number written before a formula in a balanced equation, showing the reacting ratio of particles or amounts in moles.
Used by OCR
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Multiply each relative formula mass by its balancing number, including numbers greater than 1 in front of the desired product.
Give atom economy as a percentage. A result above 100% shows that the relative masses or balancing numbers have been used incorrectly.
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