The graph below shows how the rates of the forward and reverse reactions change over time for a reversible chemical process in a closed system.
Which of the following statements correctly describes the system at any time t t\,t where t>tet > t_{\text{e}}t>te?
The reaction has reached static equilibrium, meaning both the forward and reverse reactions have stopped.
The forward and reverse rate constants (kfk_{\text{f}}kf and krk_{\text{r}}kr) must be equal to one another.
The concentration of products has become equal to the concentration of reactants.
The system is in dynamic equilibrium; macroscopic properties remain constant while forward and reverse reactions continue at equal, non-zero rates.
Equilibria Questions
Practise OCR GCSE Chemistry Equilibria with exam-style questions for Foundation and Higher tier. 35 questions, matched to the OCR GCSE Chemistry (J248) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.