Saudi Secondary School Certificate · Advanced Physics and Chemistry

Physical and organic chemistry

43 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 43 questions

  1. For N₂ + 3H₂ ⇌ 2NH₃ the equilibrium concentrations are [N₂] = 3, [H₂] = 2 and [NH₃] = 5 mol/L. What is Kc?
  2. For N₂ + 3H₂ ⇌ 2NH₃ the equilibrium concentrations are [N₂] = 1, [H₂] = 2 and [NH₃] = 6 mol/L. What is Kc?
  3. For N₂ + 3H₂ ⇌ 2NH₃ the equilibrium concentrations are [N₂] = 2, [H₂] = 3 and [NH₃] = 2 mol/L. What is Kc?
  4. For N₂ + 3H₂ ⇌ 2NH₃ the equilibrium concentrations are [N₂] = 3, [H₂] = 3 and [NH₃] = 5 mol/L. What is Kc?
  5. For N₂ + 3H₂ ⇌ 2NH₃ the equilibrium concentrations are [N₂] = 2, [H₂] = 3 and [NH₃] = 3 mol/L. What is Kc?
  6. For N₂ + 3H₂ ⇌ 2NH₃ the equilibrium concentrations are [N₂] = 2, [H₂] = 3 and [NH₃] = 6 mol/L. What is Kc?
  7. For N₂ + 3H₂ ⇌ 2NH₃ the equilibrium concentrations are [N₂] = 3, [H₂] = 3 and [NH₃] = 3 mol/L. What is Kc?
  8. Using E° values of -0.14 V for Sn²⁺/Sn and -0.13 V for Pb²⁺/Pb, what is the standard cell potential of a Sn-Pb cell?
  9. Using E° values of -0.25 V for Ni²⁺/Ni and 0.34 V for Cu²⁺/Cu, what is the standard cell potential of a Ni-Cu cell?
  10. Using E° values of -0.25 V for Ni²⁺/Ni and -0.14 V for Sn²⁺/Sn, what is the standard cell potential of a Ni-Sn cell?
  11. Given equation (1) with ΔH = -394 kJ and equation (2) with ΔH = -283 kJ, find ΔH for the reaction (1) - (2).
  12. Given equation (1) with ΔH = -1560 kJ and equation (2) with ΔH = -242 kJ, find ΔH for the reaction (1) - (2).
  13. Given equation (1) with ΔH = -1560 kJ and equation (2) with ΔH = -283 kJ, find ΔH for the reaction (1) - (2).
  14. Given equation (1) with ΔH = -286 kJ and equation (2) with ΔH = -242 kJ, find ΔH for the reaction (1) - (2).
  15. Given equation (1) with ΔH = -394 kJ and equation (2) with ΔH = -44 kJ, find ΔH for the reaction (1) - (2).
  16. Given equation (1) with ΔH = -394 kJ and equation (2) with ΔH = -393 kJ, find ΔH for the reaction (1) - (2).
  17. Given equation (1) with ΔH = -394 kJ and equation (2) with ΔH = -75 kJ, find ΔH for the reaction (1) - (2).
  18. 25 mL of 0.25 mol/L HCl neutralises 40 mL of NaOH solution. What is the concentration of the NaOH?
  19. 10 mL of 0.1 mol/L HCl neutralises 40 mL of NaOH solution. What is the concentration of the NaOH?
  20. 50 mL of 0.1 mol/L HCl neutralises 25 mL of NaOH solution. What is the concentration of the NaOH?
  21. 20 mL of 0.25 mol/L HCl neutralises 25 mL of NaOH solution. What is the concentration of the NaOH?
  22. 50 mL of 0.25 mol/L HCl neutralises 25 mL of NaOH solution. What is the concentration of the NaOH?
  23. 50 mL of 0.2 mol/L HCl neutralises 25 mL of NaOH solution. What is the concentration of the NaOH?
  24. 50 mL of 0.1 mol/L HCl neutralises 20 mL of NaOH solution. What is the concentration of the NaOH?
  25. What is the pH of a 10^-2 mol/L solution of KOH at 25 degrees Celsius?
  26. How many moles are in 11 g of CO₂? (M = 44 g/mol)
  27. How many moles are in 20 g of NaOH? (M = 40 g/mol)
  28. How many moles are in 318 g of Na₂CO₃? (M = 106 g/mol)
  29. How many moles are in 500 g of CaCO₃? (M = 100 g/mol)
  30. How many moles are in 4.25 g of NH₃? (M = 17 g/mol)
  31. What is the molecular formula of nonane?
  32. What is the molecular formula of propane?
  33. What is the molecular formula of hexane?
  34. What is the molecular formula of butane?
  35. Which reagent turns acidified potassium dichromate(VI) from orange to green with a primary alcohol?
  36. What type of reaction is the formation of ethyl ethanoate from ethanol and ethanoic acid?
  37. Which of these shows optical isomerism?
  38. What is the effect of adding a catalyst to a reaction at equilibrium?
  39. What happens to Kc for an endothermic reaction when the temperature increases?
  40. Which species is the oxidising agent in Zn + Cu²⁺ → Zn²⁺ + Cu?
  41. What is the hybridisation of carbon in ethene?
  42. Which intermolecular force is strongest in liquid hydrogen fluoride?
  43. Which of these oxides is amphoteric?

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