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GCSE Chemistry · key term
The reactant that is completely used up first and therefore determines the maximum amount of product that can form.
Used by AQA, Edexcel and OCR
Specification 4.3.2.4 · Paper 1
The reactant that is completely used up in a reaction and therefore determines the maximum amount of product that can form.
Revise: Limiting ReactantsThe reactant that is completely used up is the limiting reactant. Once it has gone, the required reacting particles are no longer available, so no more product can form. The other reactant is in excess and some of it is left unreacted.
Specification 1.52, 5.12C, 5.18C, 7.5 · Paper 1, Paper 2
The reactant that is completely used up first and therefore controls the maximum amount of product that can form.
Revise: Limiting ReactantsThe limiting reactant is the reactant that is completely used up first. Any other reactant supplied beyond the amount required is an excess reactant, and some of it remains after the limiting reactant has gone.
The reactant that is used up first according to the balanced equation and therefore limits the theoretical amount of product.
The reactant that is used up first and therefore determines the amount of product formed.
The reactant that is completely used up first and therefore limits the amount of product that can form.
Specification CM2.1i, C3.1k, C5.1e, C5.1g · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The reactant that is used up first and therefore determines the greatest possible amount of product.
Revise: Quantitative CalculationsThe reactant that permits fewer complete equation-ratio sets is the limiting reactant; predictions of product amount must be based on it.
The reactant that is completely used up first and therefore limits the amount of product that can form.
The reactant that is used up first and therefore determines the maximum amount of product that can form.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Stoichiometry and limiting reactantsIf they are not supplied in that ratio, one reactant is consumed first. This is the limiting reactant. Once it has been used up, the reaction cannot continue because no more complete reacting groups can be formed.
The reactant that is used up first and therefore limits the amount of product that can form.
Never identify the limiting reactant by comparing masses in grams. Convert each mass to moles, then apply the mole ratio from the balanced equation.
A quick comparison is to calculate coefficient for each reactant. The smallest value identifies the limiting reactant.
Calculate the maximum amount of product from the limiting reactant, not from the reactant in excess.
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