B.0.2—Ratios, fractions and percentages

Use ratios, fractions and percentages, including percentage yield, atom economy, and constructing or balancing equations from ratios.

Use b.0.2—ratios, fractions and percentages to connect the rule to the data and decision in the question.

This matters because b.0.2—ratios, fractions and percentages determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b.0.2—ratios, fractions and percentages to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: B.0.2—Ratios, fractions and percentages is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.