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O Level Chemistry 5070 · Stoichiometry. 1 State the formulae of the elements and compounds named in the subject content 2 Define the molecular formula of a compound as the number and type of different atoms in one molecule 3 Define the empirical formula of a compound as the simplest whole number ratio of the different atoms or ions in a compound 4 Deduce the formula of a simple compound from the relative numbers of atoms or ions present in a model or a diagrammatic representation 5 Deduce the formula of an ionic compound from the charges on the ions 6 Construct word equations, symbol equations and ionic equations to show how reactants form products, including state symbols 7 Deduce the symbol equation with state symbols for a chemical reaction, given relevant information

It came up in 43 of 72 papers, for about 3 marks a paper when it does. It last came up in October/November 2025.

Often set with The mole and the Avogadro constant, Reversible reactions and equilibrium, Simple molecules and covalent bonds, Air quality and climate.

89 questions, newest first

  1. 5070/11/O/N/25 Question 8 · 1 mark
  2. 5070/12/O/N/25 Question 7 · 1 mark
  3. 5070/21/O/N/25 Question 5 part (d(i)) · 2 marks
  4. 5070/21/O/N/25 Question 6 part (e) · 1 mark
  5. 5070/22/O/N/25 Question 1 part (a(iii)) · 1 mark
  6. 5070/22/O/N/25 Question 5 part (d) · 3 marks
  7. 5070/22/O/N/25 Question 6 part (d) · 1 mark
  8. 5070/11/M/J/25 Question 9 · 1 mark
  9. 5070/11/M/J/25 Question 10 · 1 mark
  10. 5070/21/M/J/25 Question 7 part (c) · 2 marks
  11. 5070/22/M/J/25 Question 5 part (b(ii)) · 1 mark
  12. 5070/22/M/J/25 Question 7 part (d) · 2 marks
  13. 5070/11/O/N/24 Question 7 · 1 mark
  14. 5070/12/O/N/24 Question 10 · 1 mark
  15. 5070/21/O/N/24 Question 2 part (f) · 2 marks
  16. 5070/21/O/N/24 Question 5 part (a) · 1 mark
  17. 5070/22/O/N/24 Question 2 part (f) · 2 marks
  18. 5070/22/O/N/24 Question 5 part (a) · 1 mark
  19. 5070/11/M/J/24 Question 6 · 1 mark
  20. 5070/12/M/J/24 Question 7 · 1 mark
  21. 5070/21/M/J/24 Question 1 part (e) · 1 mark
  22. 5070/21/M/J/24 Question 2 part (a) · 2 marks
  23. 5070/21/M/J/24 Question 5 part (e) · 2 marks
  24. 5070/22/M/J/24 Question 1 part (e) · 1 mark
  25. 5070/22/M/J/24 Question 2 part (a) · 2 marks
  26. 5070/22/M/J/24 Question 5 part (e) · 2 marks
  27. 5070/22/M/J/24 Question 8 part (c(ii)) · 1 mark
  28. 5070/41/M/J/24 Question 2 part (a(iv)) · 1 mark
  29. 5070/11/O/N/23 Question 7 · 1 mark
  30. 5070/21/O/N/23 Question 2 part (e) · 2 marks
  31. 5070/21/O/N/23 Question 3 part (a) · 2 marks
  32. 5070/21/O/N/23 Question 7 part (e(iii)) · 1 mark
  33. 5070/21/O/N/23 Question 9 part (c) · 2 marks
  34. 5070/22/O/N/23 Question 2 part (c) · 2 marks
  35. 5070/22/O/N/23 Question 3 part (a) · 2 marks
  36. 5070/22/O/N/23 Question 9 part (c) · 2 marks
  37. 5070/12/M/J/23 Question 7 · 1 mark
  38. 5070/21/M/J/23 Question 4 part (c) · 1 mark
  39. 5070/21/M/J/23 Question 9 part (b) · 1 mark
  40. 5070/22/M/J/23 Question 4 part (c) · 1 mark
  41. 5070/11/O/N/22 Question 12 · 1 mark
  42. 5070/11/O/N/22 Question 14 · 1 mark
  43. 5070/12/O/N/22 Question 9 · 1 mark
  44. 5070/12/O/N/22 Question 12 · 1 mark
  45. 5070/12/O/N/22 Question 14 · 1 mark
  46. 5070/12/O/N/22 Question 34 · 1 mark
  47. 5070/21/O/N/22 Question 3 part (e(i)) · 2 marks
  48. 5070/21/O/N/22 Question 4 part (e) · 2 marks
  49. 5070/21/O/N/22 Question 6 part (b(i)) · 2 marks
  50. 5070/21/O/N/22 Question 7 part (a) · 1 mark
  51. 5070/22/O/N/22 Question 6 part (c) · 2 marks
  52. 5070/22/O/N/22 Question 7 part (a) · 1 mark
  53. 5070/22/O/N/22 Question 8 part (d) · 2 marks
  54. 5070/11/M/J/22 Question 12 · 1 mark
  55. 5070/12/M/J/22 Question 12 · 1 mark
  56. 5070/21/M/J/22 Question 1 part (e) · 1 mark
  57. 5070/21/M/J/22 Question 5 part (b(i)) · 2 marks
  58. 5070/22/M/J/22 Question 1 part (e) · 1 mark
  59. 5070/22/M/J/22 Question 2 part (e(i)) · 1 mark
  60. 5070/22/M/J/22 Question 6 part (a) · 2 marks
  61. 5070/22/M/J/22 Question 10 part (a) · 1 mark
  62. 5070/12/O/N/21 Question 9 · 1 mark
  63. 5070/21/O/N/21 Question 6 part (c) · 1 mark
  64. 5070/21/O/N/21 Question 8 part (b) · 1 mark
  65. 5070/22/O/N/21 Question 6 part (c) · 1 mark
  66. 5070/22/O/N/21 Question 7 part (c) · 1 mark
  67. 5070/11/M/J/21 Question 9 · 1 mark
  68. 5070/11/M/J/21 Question 12 · 1 mark
  69. 5070/21/M/J/21 Question 5 part (a) · 1 mark
  70. 5070/21/M/J/21 Question 6 part (e(ii)) · 1 mark
  71. 5070/22/M/J/21 Question 6 part (d(i)) · 2 marks
  72. 5070/22/M/J/21 Question 7 part (d) · 3 marks
  73. 5070/11/O/N/20 Question 14 · 1 mark
  74. 5070/12/O/N/20 Question 13 · 1 mark
  75. 5070/21/O/N/20 Question 2 part (b) · 1 mark
  76. 5070/21/O/N/20 Question 3 part (d) · 2 marks
  77. 5070/21/O/N/20 Question 4 part (c) · 1 mark
  78. 5070/21/O/N/20 Question 5 part (c) · 1 mark
  79. 5070/21/O/N/20 Question 8 part (b) · 1 mark
  80. 5070/21/O/N/20 Question 9 part (d) · 1 mark
  81. 5070/22/O/N/20 Question 4 part (b) · 1 mark
  82. 5070/22/O/N/20 Question 8 part (b) · 1 mark
  83. 5070/22/O/N/20 Question 9 part (b(ii)) · 1 mark
  84. 5070/12/M/J/20 Question 13 · 1 mark
  85. 5070/21/M/J/20 Question 2 part (b) · 1 mark
  86. 5070/21/M/J/20 Question 8 part (c(i)) · 2 marks
  87. 5070/21/M/J/20 Question 9 part (d) · 1 mark
  88. 5070/22/M/J/20 Question 7 part (c(i)) · 2 marks
  89. 5070/22/M/J/20 Question 9 part (b) · 2 marks

More in Stoichiometry: Relative masses of atoms and molecules, The mole and the Avogadro constant.

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