A student records the time, ttt, for a fixed visible change to occur when solution J reacts with solution K. For this change, the relative rate is represented by 1t\dfrac{1}{t}t1. The rate is directly proportional to the concentration of solution J. The student triples the concentration of solution J.
Which statement is correct?
The time taken remains unchanged.
The time taken becomes one third as long.
The time taken becomes three times as long.
The time taken becomes one ninth as long.
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.