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Combined Science: Chemistry

GCSE · Edexcel · higher

QuestionsFlashcards

Group 1
- Group 1 (Alkali Metals)
  5
- Group 1: Reactivity & Electronic Configurations
  3
Group 7
Group 0

Limiting Reactants Flashcards

All 4 cards in this deck

What is the limiting reactant in a reaction?: The reactant that is not in excess — it is completely used up and controls the mass of product formed.
Why does the limiting reactant control the mass of product formed?: Once it is all used up the reaction stops, so no more product can be made even though other reactants remain.
True or false? The reactant present in the smaller mass is always the limiting reactant.: False. You must compare moles using the ratio in the balanced equation, not masses.
How is the amount of product made related to the amount of limiting reactant used?: It is directly proportional: doubling the moles of limiting reactant doubles the moles of product (if the other reactants are in excess).