Only the reactants of a reversible reaction are placed in a sealed flask at the start.
Which statement describes how the rates change until dynamic equilibrium is reached?
The forward rate increases and the reverse rate decreases until they are equal.
The forward rate decreases and the reverse rate increases until they are equal.
The forward rate and the reverse rate both decrease until they reach zero.
The forward rate decreases and the reverse rate stays at zero throughout.
47 exam-style questions on OCR GCSE Chemistry 5.3 Equilibria, covering 5.3.1 Reversible reactions and dynamic equilibrium and 5.3.2 Changing the position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.