B.2.2—Changing the subject of an equation

Change the subject of an equation in structured and unstructured chemical calculations. A2 applications include calculating a rate constant from a rate equation.

Use b.2.2—changing the subject of an equation to connect the rule to the data and decision in the question.

This matters because b.2.2—changing the subject of an equation determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b.2.2—changing the subject of an equation to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: use the formula and units given in the question, show the substitution and interpret the result; the calculation alone is not the conclusion.