Question detail

For Atom economy, which unit conversion answer best supports this Unit 4.3 objective: (chemistry only) Calculate atom economy for a reaction to form a desired product from a balanced equation?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Yield and atom economy of chemical reactions (chemistry only)

Question

A. 80%
B. Wrong unit conversion: confuses chemistry only with a nearby Unit 4.3 idea
C. Wrong unit check: uses the wrong unit for Atom economy
D. Wrong calculation link: does not support (chemistry only) Calculate atom economy for a reaction to form a desired product from a balanced equation

Answer

The correct option is 80%. The calculated answer is 80 %.

Explanation

The correct option is 80%. This uses Percentage Yield because the objective is about (chemistry only) Calculate atom economy for a reaction to form a desired product from a balanced equation. This unit conversion variant asks students to separate chemistry only from similar Unit 4.3 calculation steps. The reasoning belongs to Atom economy within Yield and atom economy of chemical reactions (chemistry only), so it should not be confused with nearby quantitative ideas such as mass, moles, concentration, yield, atom economy, or gas volume unless those are named in the objective. Use the focus term chemistry only to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3. The other options are weaker because they either use the wrong formula, the wrong unit, a vague relationship, or the wrong quantitative context.

Common mistake

Confusing Atom Economy with Percentage Yield

Students often confuse atom economy with percentage yield, thinking they are the same concept.

Remember that atom economy measures the efficiency of a reaction in terms of starting materials converted to useful products, while percentage yield compares the actual product obtained to the theoretical maximum. Keep the correction anchored to Atom economy; check formula, substitution, calculation, final answer, and unit where relevant.

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For Atom economy, which option best supports this Unit 4.3 objective: (chemistry only) Calculate atom economy for a reaction to form a desired product from a balanced equation?