Question detail

Case 26 unit-check. A student checks the units in a calculation. Which decision keeps the method valid? Focus on Substitute numerical into algebraic equations units 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 26 unit-check: Keep the required unit linked to the quantity being calculated for Substitute numerical into algebraic equations units
B. Case 26 unit-check: Ignore the unit because the number is more important (Concentrations in mol/dm3 and titration calculations)
C. Case 26 unit-check: Swap dm3 and cm3 without converting the value (Substitute numerical into algebraic equations units)
D. Case 26 unit-check: Use grams, moles, and percentage signs interchangeably (Using concentrations of solutions in mol/dm3 (chemistry only) (HT only))

Answer

The correct option is Case 26 unit-check: Keep the required unit linked to the quantity being calculated for Substitute numerical into algebraic equations units.

Explanation

The correct option is Case 26 unit-check: Keep the required unit linked to the quantity being calculated for Substitute numerical into algebraic equations units. It supports the approved learning objective by keeping the method tied to Substitute numerical into algebraic equations units 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

Incorrect Unit Conversion

Students often forget to convert volumes from cm3 to dm3 when substituting into concentration equations.

Always convert cm3 to dm3 by dividing by 1000 before using the volume in calculations.

Related flashcards

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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) Substitute numerical values into algebraic equations using appropriate units. (MS 3c)?