Last updated on Sep 22, 2026

Limiting Reactants (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards

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Limiting Reactants

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Limiting reactant definition

Substance used up first, stopping the reaction

What limiting reactant limits

Amount of product formed

When limiting reactant used up

Reaction stops, even if others remain

Limiting reactant in $CuO$ + $C$ example

$CuO$

$CuO$ : $C$ mole ratio in example

$2:1$

Moles of $CuO$ from $7.95g$ ( $M_r=79.5$ )

$0.1$ moles

Moles of $C$ from $7.2g$ ( $A_r=12$ )

$0.6$ moles

Mass of $Cu$ from $0.1$ mol $CuO$

$6.35g$

Mass of $CO_2$ from $0.1$ mol $CuO$

$2.2g$ (from $0.05$ mol $CO_2$ )

Moles $C$ needed for $0.1$ mol $CuO$

$0.05$ moles

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Revision Notes by Topics

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Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Quizzes by Topics

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Calculating Mass of Substances

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Exam Questions by Topics

Measurement, Mass & Equations

Calculating Mass of Substances

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