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GCSE Chemistry · key term
A chemical equation with the same number of atoms of each element on both sides.
Used by AQA, Edexcel and OCR
Specification 4.3.2.3, 4.5.1.3 · Paper 1
A symbol equation with the same number of atoms of every element on each side.
Revise: Balancing Equations using MolesThe equation represents the same proportions if every coefficient is multiplied by the same number, but balanced equations are normally written using the simplest whole-number ratio.
A reaction equation with the same number of atoms of each element on both sides.
Specification 5.17C · Paper 1, Paper 2
A symbol equation containing the same number of atoms of each element on the reactant and product sides.
Revise: Mathematical ApplicationsThe coefficients in a balanced equation give relative quantities.
Specification CM2.1iv, CM3.1i, C3.1l, C3.3f, CM3.4i · Paper 1 (Foundation), Paper 3 (Higher)
A chemical equation with the same number of atoms of each element on both sides, showing the proportions in which substances react and form.
A chemical equation with equal numbers of atoms of each element on both sides.
A symbol equation containing the same number of atoms of each element on both sides.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A chemical equation with the same number of atoms of each element on the reactant and product sides.
Revise: Relative formula massesA balanced equation therefore has the same number of each type of atom on both sides. A large number before a formula is a coefficient: it multiplies the whole formula, unlike a subscript within it.
A chemical equation with coefficients showing the relative numbers of moles of every reactant and product.
Write the balanced equation or displayed formula first: the balancing numbers determine how many of each bond must be counted.
In a balanced equation, multiply each relative formula mass by its coefficient before comparing the two sides. Do not change subscripts to make the masses match.
Start with a balanced equation: its coefficients provide the mole ratio, not a mass ratio.
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