Question detail

Case 48 unit-check. A student checks the units in a calculation. Which decision keeps the method valid? Focus on yield the amount product obtained reaction in Percentage yield, not on a neighbouring Unit 4.3 idea.

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. Case 48 unit-check: Keep the required unit linked to the quantity being calculated for yield the amount product obtained reaction
B. Case 48 unit-check: Ignore the unit because the number is more important (Percentage yield)
C. Case 48 unit-check: Swap dm3 and cm3 without converting the value (yield the amount product obtained reaction)
D. Case 48 unit-check: Use grams, moles, and percentage signs interchangeably (Yield and atom economy of chemical reactions (chemistry only))

Answer

The correct option is Case 48 unit-check: Keep the required unit linked to the quantity being calculated for yield the amount product obtained reaction.

Explanation

The correct option is Case 48 unit-check: Keep the required unit linked to the quantity being calculated for yield the amount product obtained reaction. It supports the approved learning objective by keeping the method tied to yield the amount product obtained reaction in Percentage yield. The other options are incorrect because they either use the wrong quantitative relationship, lose the required unit, confuse coefficients with subscripts, or report an answer without a complete worked method.

Common mistake

Confusing Yield Definition

Students often confuse yield with the theoretical yield, thinking it refers to the maximum possible amount of product rather than the actual amount obtained.

Clarify that yield specifically refers to the actual amount of product obtained from a reaction, not the theoretical maximum.

Related flashcards

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For Percentage yield, which option best supports this Unit 4.3 objective: (chemistry only) Define yield as the amount of product obtained from a reaction?