South Africa Matric · Physical Sciences

Acids, bases and chemical equilibrium

16 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 16 questions

  1. A catalyst increases the rate of a reaction because it
  2. Increasing the temperature increases the rate of a reaction mainly because
  3. For the equilibrium N₂(g) + 3H₂(g) ⇌ 2NH₃(g), increasing the pressure at constant temperature will
  4. Adding a catalyst to a reaction mixture at equilibrium will
  5. The forward reaction in an equilibrium is exothermic. Increasing the temperature will
  6. Which of the following is the conjugate base of HCl?
  7. Which substance is amphoteric?
  8. In an exothermic reaction, the enthalpy change ΔH is
  9. A strong monoprotic acid has a concentration of 0.1 mol·dm⁻³. What is the pH of the solution?
  10. A strong monoprotic acid has a concentration of 0.001 mol·dm⁻³. What is the pH of the solution?
  11. Calculate the pH of a solution in which [OH⁻] = mol·dm⁻³ at 25 °C.
  12. A strong monoprotic acid has a concentration of 0.01 mol·dm⁻³. What is the pH of the solution?
  13. Calculate the pH of a solution in which [H₃O⁺] = mol·dm⁻³.
  14. For the reaction , the equilibrium concentrations are [A] = 0.25, [B] = 0.2 and [C] = 0.1 mol·dm⁻³. Calculate Kc.
  15. For the reaction , the equilibrium concentrations are [A] = 0.1, [B] = 0.4 and [C] = 0.2 mol·dm⁻³. Calculate Kc.
  16. For the reaction , the equilibrium concentrations are [A] = 0.2, [B] = 0.5 and [C] = 0.4 mol·dm⁻³. Calculate Kc.

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