A-Level UK (AQA, Edexcel, OCR) · Chemistry

Kinetics and equilibria

8 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 8 questions

  1. A reaction has rate = k[A][B]^2. What happens to the rate if the concentration of B is doubled?
  2. For a reaction first order in A and first order in B, the rate is 2.4 x 10^-3 mol dm-3 s-1 when [A] = 0.10 and [B] = 0.20 mol dm-3. What is k?
  3. A first-order reaction has a rate constant of 0.0231 s-1. What is its half-life?
  4. A plot of ln k against 1/T has a gradient of -6000 K. What is the activation energy? (R = 8.31 J K-1 mol-1)
  5. For N2O4 <=> 2NO2, the equilibrium concentrations are [N2O4] = 0.040 and [NO2] = 0.080 mol dm-3. What is Kc?
  6. For N2 + 3H2 <=> 2NH3 (exothermic), what is the effect of increasing the pressure at constant temperature?
  7. For PCl5 <=> PCl3 + Cl2, the equilibrium partial pressures are PCl5 20 kPa, PCl3 40 kPa and Cl2 40 kPa. What is Kp?
  8. How does a catalyst increase the rate of a reaction?

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