Question detail

In Atom economy, which option best answers variant 3 of this quantitative chemistry objective: (chemistry only) Define atom economy as a measure of the amount of starting materials that end up as useful products?

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. formula and unit: (chemistry only) Define atom economy as a measure of the amount of starting materials that end up as useful products
B. wrong formula: uses a different Unit 4.3 relationship from Atom economy
C. wrong unit: gives a value without checking the required unit
D. wrong reasoning: confuses coefficients, subscripts, mass, moles, or concentration

Answer

The correct option is formula and unit: (chemistry only) Define atom economy as a measure of the amount of starting materials that end up as useful products.

Explanation

The correct option is formula and unit: (chemistry only) Define atom economy as a measure of the amount of starting materials that end up as useful products. It is correct because it directly supports the approved learning objective to (chemistry only) Define atom economy as a measure of the amount of starting materials that end up as useful products. This belongs to Atom economy within Yield and atom economy of chemical reactions (chemistry only), so the answer must use the named Unit 4.3 relationship and avoid mixing it with nearby ideas such as mass, moles, concentration, yield, atom economy, gas volume, coefficients, or subscripts.

Common mistake

Confusing Atom Economy with Percentage Yield

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

Remind students that atom economy measures how much of the starting materials become 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) Define atom economy as a measure of the amount of starting materials that end up as useful products?