The rate equation for the reaction between compounds A\text{A}A and B\text{B}B is:
rate=k[A]2[B] \text{rate} = k[\text{A}]^2[\text{B}] rate=k[A]2[B]In an experiment, the concentration of A\text{A}A was monitored over time, starting with an initial concentration of 0.80 mol dm−30.80\text{ mol dm}^{-3}0.80 mol dm−3.
A tangent to the concentration-time curve drawn at t=0 st = 0\text{ s}t=0 s intersects the time axis (where [A]=0.00 mol dm−3[\text{A}] = 0.00\text{ mol dm}^{-3}[A]=0.00 mol dm−3) at t=12.5 st = 12.5\text{ s}t=12.5 s. Calculate the initial rate of the reaction.
The experiment was repeated at the same temperature and with the same initial concentration of B\text{B}B but with a different initial concentration of A\text{A}A. The new initial rate was 2.252.252.25 times greater than in the original experiment. Calculate the new initial concentration of A\text{A}A.
32 exam-style questions on AQA A Level Chemistry Rate equations (A-level only), covering Rate equations (A-level only) and Determination of rate equation (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.