Question detail
Case 34 answer-sense. A student reviews the final answer. Which check best catches an exam error? Focus on the relative formula mass compound its chemical in Relative formula mass, not on a neighbouring Unit 4.3 idea.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations
Question
- A. Case 34 answer-sense: Check that the answer size, unit, and chemical context all match for the relative formula mass compound its chemical
- B. Case 34 answer-sense: Accept the answer if it has many decimal places (Relative formula mass)
- C. Case 34 answer-sense: Choose the answer with the biggest number because it looks more complete (the relative formula mass compound its chemical)
- D. Case 34 answer-sense: Drop the unit if the working contains a formula (Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations)
Answer
The correct option is Case 34 answer-sense: Check that the answer size, unit, and chemical context all match for the relative formula mass compound its chemical.
Explanation
The correct option is Case 34 answer-sense: Check that the answer size, unit, and chemical context all match for the relative formula mass compound its chemical. It supports the approved learning objective by keeping the method tied to the relative formula mass compound its chemical in Relative formula mass. 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
Misunderstanding Relative Formula Mass Calculation
Students often forget to multiply the relative atomic mass by the number of atoms indicated by the subscripts in the chemical formula.
Always ensure to multiply the relative atomic mass of each element by its subscript in the formula before summing them to find the relative formula mass.
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