Question detail

Case 67 ratio-step. A balanced equation is used in a calculation. Which interpretation is safest? Focus on Rearrange concentration equations in Concentrations in mol/dm3 and titration calculations, 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

Using concentrations of solutions in mol/dm3 (chemistry only) (HT only)

Question

A. Case 67 ratio-step: Use coefficients as mole-ratio information, not formula subscripts for Rearrange concentration equations
B. Case 67 ratio-step: Treat subscripts inside a formula as reacting mole ratios (Concentrations in mol/dm3 and titration calculations)
C. Case 67 ratio-step: Assume every reactant and product always has a 1 to 1 ratio (Rearrange concentration equations)
D. Case 67 ratio-step: Use the largest mass as the limiting amount without mole comparison (Using concentrations of solutions in mol/dm3 (chemistry only) (HT only))

Answer

The correct option is Case 67 ratio-step: Use coefficients as mole-ratio information, not formula subscripts for Rearrange concentration equations.

Explanation

The correct option is Case 67 ratio-step: Use coefficients as mole-ratio information, not formula subscripts for Rearrange concentration equations. It supports the approved learning objective by keeping the method tied to Rearrange concentration equations in Concentrations in mol/dm3 and titration calculations. 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 Rearrangement

Students often forget to isolate the variable they need when rearranging concentration equations, leading to incorrect formulas.

Practice isolating the variable step-by-step, ensuring to perform the same operation on both sides of the equation.

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For Concentrations in mol/dm3 and titration calculations, which ratio reasoning answer best supports this Unit 4.3 objective: (chemistry only) (HT only) Rearrange concentration equations. (MS 3b)?