Question detail
How does the presence of an excess reactant affect the yield of a product in a chemical reaction?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
How does the presence of an excess reactant affect the yield of a product in a chemical reaction?
Answer
The presence of an excess reactant ensures that the limiting reactant is completely used up, which can maximize the yield of the product. However, any additional excess reactant does not contribute to further product formation once the limiting reactant is consumed.
Explanation
This answer effectively explains the relationship between excess reactants and product yield, demonstrating an understanding of limiting reactants and their impact on chemical reactions. The question assesses the student's ability to apply their knowledge to explain a concept.
Common mistake
Confusing Limiting Reactants with Yield
Students often confuse the concept of limiting reactants with percentage yield, thinking that a higher yield means a reactant is not limiting.
To fix this, remember that the limiting reactant is the one that is completely consumed in the reaction, while percentage yield refers to the efficiency of the reaction in producing the expected amount of product. Keep the correction anchored to Limiting reactants (HT only); check formula, substitution, calculation, final answer, and unit where relevant.
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