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GCSE Chemistry · key term
The maximum amount of a specified product predicted from the balanced equation and the amount of reactant available.
Used by AQA, Edexcel and OCR
Specification 4.3.3.1 · Paper 1
The maximum amount of product predicted from the balanced equation, assuming the relevant reactant forms the expected product without losses.
Revise: Percentage YieldFrom this ratio, chemists can predict the maximum theoretical mass of product that could form from a stated amount of reactant. This predicted maximum is the theoretical yield.
Specification 1.52, 5.11C, 5.12C, 5.15C · Paper 1, Paper 2
The greatest amount of product predicted from the limiting reactant, assuming the reaction proceeds completely without losses or competing reactions.
Revise: Limiting ReactantsThe mass predicted from the limiting reactant is the theoretical yield. An experiment may produce less because of incomplete reaction, side reactions or losses during collection, but it cannot obtain the larger quantity predicted from an excess reactant alone.
The maximum amount of product predicted from the reacting quantities and a balanced equation, assuming complete conversion and no practical losses.
The maximum amount of a specified product predicted from the balanced equation and the limiting reactant, assuming complete conversion and no loss of product.
The maximum amount of product predicted from the balanced equation and the quantity of reactant used.
The maximum calculated amount of product that could form from the available reactants according to the balanced equation.
The maximum mass of product predicted from the amount of limiting reactant using a balanced equation.
Specification CM5.1v, C5.1h · Paper 2 (Foundation), Paper 4 (Higher)
The maximum amount of product predicted from the balanced chemical equation, assuming complete reaction and no losses.
Revise: Yield and Economy CalculationsThe theoretical yield is the maximum amount of product predicted from a balanced equation. It assumes that the relevant reactant forms product completely, no competing reactions occur and none of the product is lost.
The maximum amount of product predicted from the reacting quantities and the balanced chemical equation.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Percentage yieldA balanced chemical equation can be used to predict how much product should form from a known amount of reactant. This maximum predicted amount is the theoretical yield. It assumes that the reactants form the required product as predicted and that all of that product is recovered.
The maximum amount of a specified product predicted from the starting reactants using the balanced equation, assuming the reaction goes as expected and all the product is collected.
Check that the actual and theoretical yields are in the same unit before dividing.
Put the actual yield in the numerator and the theoretical yield in the denominator. Under valid measurements, the actual yield cannot exceed the theoretical maximum.
If a calculated yield is above 100%, suggest a measurement problem such as a product that was not dry or was contaminated; do not describe this as a genuinely greater-than-theoretical yield.
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