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GCSE Chemistry · key term
A number placed before a chemical formula that multiplies the whole formula in an equation.
Used by AQA, Edexcel and OCR
Specification 4.1.1.1, 4.3.1.2, 4.3.2.2, 4.3.2.3, 4.6.2.7 · Paper 1, Paper 2
A large number placed before a formula to show how many particles or formula units take part.
Revise: Compounds and Chemical EquationsA coefficient multiplies the entire formula.
A number written before a chemical formula that multiplies the entire formula in a chemical equation.
After balancing, recount every type of atom on both sides of the arrow and reduce coefficients to the smallest whole-number ratio.
In a balanced equation, multiply each by its coefficient before comparing the two sides.
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The number written before a chemical formula in a balanced equation; it shows the relative number of moles of that substance.
A number written before a chemical formula to show its relative amount in a balanced equation.
A number written before a formula in a balanced equation; it shows the relative number of particles or moles taking part.
The number placed before a chemical formula in a balanced equation; for a gas, it shows the relative number of molecules of that substance.
Specification 0.3, 1.48, 1.53, 5.14C · Paper 1, Paper 2
A number written before a chemical formula that multiplies every atom in that formula.
Revise: Balanced Chemical EquationsA coefficient is a number placed before a formula.
A number placed before a chemical formula that multiplies the number of every atom or formula unit represented by that formula.
The number written before a chemical formula in an equation; it multiplies the whole formula and shows the reacting proportion of that substance.
A number written in front of a chemical formula that multiplies the whole formula and shows the reacting mole ratio.
A numerical multiplier written before a chemical formula in an equation to show the relative number of particles or moles.
A number written before a chemical formula in an equation, showing the relative number of particles or moles involved.
Specification CM2.1i, CM2.1iv, C2.1c, CM2.3iv, CM3.1i, C3.1b, C3.1c, C3.1i, C3.1l, CM3.4i, CM4.1i · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The number placed before a chemical formula in a balanced equation; the coefficients give the reacting mole ratio.
Revise: Quantitative CalculationsA small subscript in a formula counts atoms within one formula unit or molecule, whereas a large coefficient in front of a formula tells you the reacting ratio.
A number placed before a chemical formula to show how many units of that substance take part in a reaction.
A number written before a formula in a chemical equation which multiplies the whole formula.
The number in ; in standard form it must be at least 1 but less than 10.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A number written in front of a chemical formula that multiplies the whole formula and shows the reacting ratio of substances.
Revise: Writing balanced equationsA coefficient multiplies the entire formula.
A number placed before a chemical formula that multiplies the number of every type of atom represented by that formula.
A number placed before a chemical formula in an equation; it multiplies every atom and bond in that formula.
A large number placed before a formula that multiplies the whole formula.
A number placed before a formula to show how many particles or formula units are involved, such as the 2 in .
Check that the symbol equation is balanced before using its coefficients.
A number placed before a chemical formula in an equation, multiplying the amount of that entire substance.
A large number placed before a formula to multiply every atom or ion represented by that formula.
A number placed before a chemical formula to show how many particles or formula units take part in a balanced equation.
The number before a formula in a chemical equation; in a balanced equation, coefficients give the ratio of amounts in moles.
A number placed before a chemical formula that multiplies the entire formula.
A number placed before a chemical formula that multiplies the whole formula and shows the reacting proportion of that substance.
The number in . In standard form, it is at least 1 but less than 10.
A number placed before a formula in a chemical equation that multiplies the whole formula.
A number written before a chemical formula in an equation; it shows the relative number of moles of that substance.
A number written before a chemical formula in an equation; it shows the relative number of particles and the relative amount in moles.
A number written before a chemical formula in an equation; it multiplies the whole formula and shows the reacting mole ratio.