Question detail
If reactant A is in excess, what can be said about reactant B?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
- A. Reactant B is the limiting reactant
- B. Reactant B is in excess
- C. Reactant B will not react
- D. Reactant B is the catalyst
Answer
Reactant B is the limiting reactant
Explanation
If reactant A is in excess, it means that reactant B is the limiting reactant, as it will be completely consumed first during the reaction.
Common mistake
Excess Reactant Misunderstanding
Students often think that using an excess of one reactant will increase the amount of product formed, rather than ensuring that the limiting reactant is fully consumed.
Emphasize that the purpose of using an excess reactant is to ensure that the limiting reactant is completely used up, which allows for maximum product yield based on the limiting reactant. Keep the correction anchored to Limiting reactants (HT only); check formula, substitution, calculation, final answer, and unit where relevant.
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