A student measures the time, ttt, for a piece of magnesium ribbon to react completely with hydrochloric acid of different concentrations.
The student uses 1t\dfrac{1}{t}t1 as a measure of the rate of reaction. The rate of reaction is directly proportional to the concentration of the acid.
Which statement is correct?
A graph of ttt against concentration is a straight line through the origin.
A graph of 1t\dfrac{1}{t}t1 against concentration is a straight line through the origin.
A graph of 1t\dfrac{1}{t}t1 against concentration is a straight line with a negative gradient.
A graph of ttt against concentration is a straight line with a positive gradient.
122 exam-style questions on OCR GCSE Chemistry 5.2 Controlling reactions, covering 5.2.1 Measuring and interpreting rate of reaction, 5.2.2 Factors affecting rate and collision theory, and 5.2.3 Catalysts, activation energy and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.