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Atomic structure and isotopes

Past-paper questions pack

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Questions are numbered; the mark schemes (the answer key) follow on separate pages so the question pages can be handed out alone. www.chemistryaleveltutor.com

OCR AS and A-level Chemistry past-paper questions since 2016 · 62 parts · mark schemes follow the questions · www.chemistryaleveltutor.com · Questions and mark schemes © OCR

1. June 2025 · Paper 1 · Q1 · 1 marks ·
1 The table shows the number of protons and neutrons in four different atoms. Atom Number of protons Number of neutrons W 17 18 X 18 18 Y 19 18 Z 18 19 Which two atoms are isotopes of the same element? A W and X B X and Y C X and Z D Y and Z Your answer [1]
2. June 2025 · AS Paper 1 · Q5 · 1 marks ·
5 Phosphorus is burnt in oxygen to produce a mixture of oxides. Which oxide has the closest to 50% by mass of phosphorus? A PO2 B P2O3 C P2O5 D P4O9 Your answer [1]
3. June 2025 · AS Paper 1 · Q21(a) · 2 marks ·
SECTION B 21 This question is about atomic structure and isotopes of two elements in Period 3. (a) This part of the question is about sulfur. Complete the table below. Species Protons Neutrons Electrons 34S 16 16 18 [2]
4. June 2025 · AS Paper 1 · Q21(b) · 2 marks ·
(b) The mass spectrum of a sample of magnesium is shown below. 75.45% Relative abundance 15.21% 9.34% 24 25 26 m / z Calculate the relative atomic mass of magnesium in the sample. Give your answer to 2 decimal places. Relative atomic mass = ......................................................... [2]
5. June 2025 · Paper 3 · Q1(a)(i) · 2 marks ·
1 This question is about spectra. (a) The mass spectrum for Br2 has peaks at m/z values of 79, 81, 158, 160 and 162. The peaks at m/z 79 and 81 have virtually the same relative abundance. (i) Complete the table to show the number of protons, neutrons and electrons in the particles that cause the peaks at m/z 79 and 81. Number of Number of Number of m/z protons neutrons electrons 79 81 [2]
6. June 2025 · Paper 3 · Q1(a)(ii) · 3 marks ·
(ii) Explain why there are peaks with m/z values of 158, 160 and 162 and predict their relative abundances. Explanation ...................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... Relative abundances ....................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... [3]
7. June 2024 · AS Paper 1 · Q2 · 1 marks ·
2 Which row shows the atomic structure of 25Mg2+? Protons Neutrons Electrons A 10 12 13 B 10 15 12 C 12 13 10 D 12 13 14 Your answer [1]
8. June 2024 · AS Paper 1 · Q21(a) · 2 marks ·
SECTION B 21 This question is about iron. (a) A sample of iron is isolated from a meteorite and analysed by mass spectrometry. The mass spectrum shows peaks with the relative abundances below. Isotope 54Fe 56Fe 57Fe 58Fe Relative abundance 78.54% 8.88% 5.10% 7.48% Calculate the relative atomic mass of the iron in the sample. Give your answer to 2 decimal places. relative atomic mass = ......................................................... [2]
9. June 2024 · Paper 1 · Q22(b)(ii) · 2 marks ·
(ii) Cobalt (III) forms an octahedral complex ion D, which contains both ammonia and chloride ligands. Complex ion D has a molar mass of 197.9 g mol–1. Determine the formula and charge of complex ion D. .......................................................................................................................................................... ..................................................................................................................................................... [2]
10. June 2024 · Paper 2 · Q22(a) · 3 marks ·
22 α-Amino acids have the general formula RCH(NH2)COOH. The R group in an α-amino acid contains C and H only. This R group has a molar mass of 91 g mol –1. (a) A polymer is formed from 500 molecules of this α-amino acid. Determine the molar mass of this polymer. Give your answer to the nearest whole number. molar mass of polymer = .............................................. g mol –1[3]
11. June 2024 · Paper 3 · Q2(c)(iii) · 2 marks ·
(iii) A research chemist synthesises two related compounds, compound C and compound D, from compound B. • In compound C, the N atoms in compound B had been replaced by P atoms. • In compound D, the O atoms in compound B had been replaced by S atoms. What is the difference between the relative molecular masses of compound C and compound D? difference = .......................................................... [2]
12. June 2024 · Paper 3 · Q4(c)(ii) · 2 marks ·
(ii) Calculate the percentage by mass of P in P3N3Cl 6. Give your answer to 2 decimal places. percentage by mass of P = ................... % [2]
13. June 2023 · AS Paper 2 · Q1(a)(i) · 2 marks · AO1, 2
1 This question is about titanium (atomic number 22) and its compounds. (a) Titanium exists as a mixture of five isotopes. A chemist analyses a sample of titanium using mass spectrometry. The results are shown in the table below. Isotope Abundance (%) 46Ti 8.30 47Ti 7.40 48Ti 73.70 49Ti 5.40 50Ti 5.20 (i) Calculate the relative atomic mass of titanium in the sample. Give your answer to 2 decimal places. relative atomic mass = ......................................................... [2]
14. June 2023 · AS Paper 2 · Q1(a)(iii) · 1 marks · AO2
(iii) Complete the table to show the number of protons, neutrons and electrons in a 48Ti2+ ion. Protons Neutrons Electrons 48Ti2+ ion [1]
15. June 2023 · Paper 2 · Q16(b)(iii) · 3 marks · AO2, 3
(iii) Organic compound B is formed by the substitution of some of the 14 H atoms in 2-methylpentane by Br atoms. 0.8649 g of compound B is heated until it is vaporised. Under the conditions used: • compound B has a volume of 72.0 cm3 • the molar gas volume is 40.0 dm3 mol–1. Determine a possible molecular formula of compound B. molecular formula = .......................................................... [3]
16. June 2023 · Paper 3 · Q4(b)(i) · 2 marks · AO1
(b) A student prepares a sample of the Tutton’s salt, (NH4)2Cu(SO4)2 • 6H2O using the method shown below. Step 1 Dissolve 0.025 mol of ammonium sulfate and 0.025 mol of hydrated copper(II) sulfate, CuSO4 • 5H2O, in water and make up to 50 cm3. Step 2 Boil the resulting mixture for 2 minutes and allow to cool. Step 3 Allow the solvent to evaporate slowly. Pale blue crystals of the Tutton’s salt form. (i) What masses are needed of ammonium sulfate and CuSO4 • 5H2O? mass of ammonium sulfate ............................................................................................ g mass of CuSO4 • 5H2O ................................................................................................... g [2]
17. June 2023 · Paper 3 · Q4(c)(i) · 1 marks · AO2
(c) The student dissolves their Tutton’s salt in water. A pale blue solution forms. The student carries out two tests on this aqueous solution. (i) The student adds an excess of aqueous ammonia to their aqueous solution of Tutton’s salt. A deep blue solution forms. The complex ion responsible for the deep blue solution has a molar mass of 167.5 g mol–1. Suggest the formula of this complex ion. ...................................................................................................................................... [1]
18. June 2023 · Paper 3 · Q6(c)(ii) · 3 marks · AO3
(ii) In the reduction process in this reaction, HNO3 and H+ react together to form 2 oxides: X (Mr = 30) and Z (Mr = 18). Determine the formulae of X and Z and write the half-equation for this reduction. X = ...................... Z = ...................... half-equation ................................................................................................................ [3]
19. June 2022 · AS Paper 1 · Q22(a) · 2 marks · AO1
22 This question is about atomic structure and formulae. (a) The relative atomic mass of a sample of osmium can be determined from its mass spectrum, shown below. 43.89% 27.23% relative abundance 16.75% (%) 12.13% 185 186 187 188 189 190 191 192 193 194 195 m / z Calculate the relative atomic mass of osmium in the sample. Give your answer to two decimal places. relative atomic mass = ......................................................... [2]
20. June 2022 · AS Paper 1 · Q22(b) · 2 marks · AO1
(b) Complete the table for an atom and an ion of two different elements. Mass Element Protons Neutrons Electron configuration Charge number 28 34 0 ................... ................... ................................................. 33 1s22s22p63s23p6 3– ................... ................... ................... [2]
21. June 2022 · AS Paper 1 · Q24(b) · 5 marks · AO3
(b) A student is supplied with aqueous solutions of ionic compounds B and C. Compound B is a chloride, bromide or iodide of a Group 1 element. Compound C is a chloride, bromide or iodide of a Group 2 element. The molar masses of B and C are both in the range 100–115 g mol–1. Use this information and test-tube tests to show how the student could identify the halide present in B and C and the formulae of B and C. Explain your reasoning. In your answer, include observations, colours and equations. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [5]
22. June 2022 · Paper 2 · Q8 · 1 marks · AO2
8 The structure of the painkiller, paracetamol, is shown below. OH O N H paracetamol A tablet contains 3.31 × 10–3 mol of paracetamol. What is the mass of paracetamol in the tablet? A 493 mg B 497 mg C 500 mg D 506 mg Your answer [1]
23. June 2022 · Paper 2 · Q19(d)(ii) · 2 marks · AO2
(ii) What is the relative molecular mass, Mr, of the polymer? Mr = ......................................................... [2]
24. June 2022 · Paper 3 · Q1(b)(i) · 1 marks · AO2
(b) Brass is an alloy of copper and zinc. The mass spectrum of a sample of brass is shown below. 45.64% Relative abundance 20.36% 16.82% 9.53% 6.27% 1.38% 60 61 62 63 64 65 66 67 68 69 70 m/z The peaks at m/z = 63 and m/z = 65 are from the 63Cu and 65Cu isotopes of copper. The remaining four peaks are from isotopes of zinc. (i) What are the percentage compositions of copper and zinc in the brass sample? Cu = ............. % Zn = ............. % [1]
25. June 2022 · Paper 3 · Q1(b)(ii) · 2 marks · AO1
(ii) Calculate the relative atomic mass of zinc in the sample of brass. Give your answer to 2 decimal places. relative atomic mass = .......................................................... [2]
26. November 2021 · AS Paper 1 · Q21(b) · 1 marks · AO1
(b) Selenium, Se, has the atomic number 34. 76Se and 82Se are two isotopes of selenium. Complete the table to show the numbers of protons, neutrons and electrons in these two isotopes. Protons Neutrons Electrons 76Se ................ ................ ................ 82Se ................ ................ ................ [1]
27. November 2021 · AS Paper 1 · Q21(c) · 2 marks · AO1
(c) The relative atomic mass of an element can be determined from its mass spectrum. The table shows the results of a mass spectrum of a sample of sulfur, S. Isotope Abundance (%) 32S 94.93 33S 0.78 34S 4.29 Calculate the relative atomic mass of the sample of sulfur. Give your answer to 3 decimal places. relative atomic mass = ......................................................... [2]
28. November 2021 · AS Paper 2 · Q3(c) · 5 marks · AO2, 3
(c) Calculate the value of n in HOOC(CH2)nCOOH. Give your answer to the nearest whole number. n = .......................................................... [5]
29. November 2020 · Paper 1 · Q16(a) · 1 marks · AO1
SECTION B Answer all the questions. 16 This question is about magnesium, bromine and magnesium bromide. (a) Relative atomic mass is defined as ‘the weighted mean mass compared with 1/12th mass of carbon-12’. Explain what is meant by the term weighted mean mass. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [1]
30. November 2020 · AS Paper 1 · Q21(b) · 2 marks · AO1
(b) Most elements contain atoms of different isotopes. State any differences and similarities between the atomic structures of isotopes of the same element. Differences ................................................................................................................................ ................................................................................................................................................... Similarities ................................................................................................................................ ................................................................................................................................................... [2]
31. November 2020 · AS Paper 1 · Q21(c)(i) · 2 marks · AO1
(c) Mass spectrometry can be used to identify the isotopes of chlorine. Part of the mass spectrum of chlorine is shown below. 75.76 relative abundance (%) 24.24 32 33 34 35 36 37 38 m / z (i) Calculate the relative atomic mass of chlorine. Give your answer to 2 decimal places. relative atomic mass = .......................................................... [2]
32. November 2020 · AS Paper 1 · Q21(c)(ii) · 2 marks · AO3
(ii) The mass spectrum of chlorine, Cl 2, also contains three molecular ion, M+, peaks. One of the M+ peaks has an m /z value of 72. Suggest why an M+ peak at m /z = 72 is observed and predict the m /z values of the other two M+ peaks. Peak at m /z = 72 ............................................................................................................... ........................................................................................................................................... ........................................................................................................................................... m /z values of the other two M+ peaks ............................................................................... [2]
33. November 2020 · Paper 2 · Q21(b)(iii) · 3 marks · AO2
(iii) Some people are concerned that aspartame, C14H18N2O5, may have adverse health effects. Research shows that the safe maximum daily intake of aspartame is 1.7 × 10−4 mol kg−1. • A typical UK adult has a mass of 75 kg. • A can of a diet drink contains 167 mg of aspartame. How many cans of this diet drink is it safe for a typical adult to drink in one day? Number of cans = .......................................................... [3]
34. November 2020 · Paper 3 · Q4(b)(ii) · 3 marks · AO1, 2, 3
(ii) Calculate the molar mass of X2CO3 and identify metal X. Molar mass of X2CO3 = .................... g mol−1 Metal X = ....................[3]
35. June 2019 · AS Paper 1 · Q3 · 1 marks · AO1
3 What is the percentage composition by mass of nitrogen in (NH4)2CO3? A 14.58% B 17.95% C 29.17% D 37.50% Your answer [1]
36. June 2019 · Paper 1 · Q3 · 1 marks · AO2
3 One molecule of a gas has a mass of 2.658 × 10−23 g. What is a possible formula of the gas? A CH4 B O2 C SO2 D SO3 Your answer [1]
37. June 2019 · Paper 1 · Q16(b) · 2 marks · AO2
(b) A sample of magnesium, Ar = 24.305, is found to consist of three isotopes. The accurate relative isotopic masses and % abundances of two of the isotopes are shown in the table. Isotope Relative isotopic mass % abundance 24 Mg 23.985 78.99% 25 Mg 24.986 10.00% Determine the relative isotopic mass of the third isotope of magnesium in the sample. Give your answer to 5 significant figures. relative isotopic mass = ......................................................... [2]
38. June 2019 · Paper 1 · Q18(c)(iii) · 1 marks · AO3
(iii) Some iron supplements contain iron(II) sulfate or iron(II) fumarate. The information in Table 18.3 is taken from the labels of two iron supplements, A and B. Mass of iron compound in Iron supplement Iron compound one tablet / mg A iron(II) sulfate, FeSO4 180 B iron(II) fumarate, C4H2FeO4 210 Table 18.3 Choose which iron supplement, A or B, would provide the greater mass of iron per tablet. iron supplement: ......................................................... [1]
39. June 2019 · AS Paper 1 · Q21(a) · 1 marks · AO1
SECTION B Answer all the questions. 21 This question is about atomic structure and the compounds of calcium, nitrogen and oxygen. (a) Most elements contain different isotopes. State two differences between isotopes of the same element. ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [1]
40. June 2019 · AS Paper 1 · Q21(b) · 2 marks · AO1
(b) Complete the table for an atom and an ion of two different elements. Mass Element Protons Neutrons Electrons Charge number 26 28 0 .................. .................. .................. 80 36 2− .................. .................. .................. [2]
41. June 2019 · AS Paper 2 · Q1(a)(i) · 2 marks · AO1
1 This question is about the properties and reactions of the Group 2 element strontium. (a) The relative atomic mass of strontium can be determined using a mass spectrometer. (i) Explain what is meant by the term relative atomic mass of an element. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [2]
42. June 2019 · AS Paper 2 · Q1(a)(ii) · 2 marks · AO1
(ii) A sample of strontium has a relative atomic mass of 87.73. The sample consists of: • 82.9% Sr-88 • 6.9% Sr-87 • one other isotope. Determine the other isotope of strontium in the sample. isotope of strontium = .......................................................... [2]
43. June 2019 · Paper 2 · Q18(d) · 2 marks · AO2
(d) A polyester is formed from 200 molecules of 4-hydroxybenzoic acid. What is the relative molecular mass, Mr, of the polyester? Mr = ............................................. g mol−1 [2]
44. June 2019 · Paper 3 · Q1(b) · 1 marks · AO1
(b) Explain why a small proportion of molecules in water have a relative molecular mass of 20. ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [1]
45. June 2019 · Paper 3 · Q6(a)(i) · 2 marks · AO3
6 This question is about reactions of iron compounds. (a) A student carries out the reactions in the flowchart, starting with iron(II) sulfide. H+ / H2O iron(II) sulfide [Fe(H2O)6]2+(aq) + H2S (g) pale green solution Cl 2(g) AgNO3(aq) H+(aq)/MnO4 −(aq) orange-brown colourless solution solution containing Mn2+ ions black precipitate B + NaOH(aq) with a molar mass yellow solid of 247.9 g mol–1 orange-brown precipitate A (i) In the boxes, write the formulae of A and B. [2]
46. June 2018 · Paper 1 · Q1 · 1 marks · AO2
1 A sample of boron contains the isotopes 10B and 11B. The relative atomic mass of the boron sample is 10.8. What is the percentage of 11B atoms in the sample of boron? A 8.0% B 20% C 80% D 92% Your answer [1]
47. June 2018 · AS Paper 1 · Q21(a)(i) · 1 marks ·
SECTION B Answer all the questions. 21 This question is about elements from the p-block of the periodic table. (a) Silicon exists as a mixture of three isotopes, 28Si, 29Si and 30Si. (i) Complete the table to show the atomic structure of 30Si. Protons Neutrons Electrons 30Si ............... ............... ............... [1]
48. June 2018 · AS Paper 1 · Q21(a)(ii) · 2 marks ·
(ii) A sample of silicon is analysed by mass spectrometry. The mass spectrum shows peaks with the relative abundances below. • 28Si 92.23% • 29Si 4.68% • 30Si 3.09% Calculate the relative atomic mass of silicon in the sample. Give your answer to two decimal places. relative atomic mass = .......................................................... [2]
49. June 2018 · AS Paper 2 · Q1(d)(ii) · 1 marks ·
(ii) A is an organic acid, containing C, H and O only. One molecule of A contains two COOH groups. Suggest the structure of A. [1]
50. June 2018 · AS Paper 2 · Q2(c)(ii) · 2 marks ·
(ii) Sodium selenide reacts with hydrochloric acid to form a toxic gas, B, with a relative molecular mass of 81.0. Identify gas B and write an equation for this reaction. Gas B ..................... Equation ....................................................................................................................... [2]
51. June 2018 · Paper 3 · Q1(a)(vi) · 1 marks ·
(vi) The element X, which forms a compound with hydrogen, XH3, with a molar mass of 34.0 g mol–1. .............................. [1]
52. June 2017 · AS Paper 1 · Q1 · 1 marks ·
1 Which ion has a different number of electrons from the other three ions? A Ga3+ B Cl − C S2− D Ca2+ Your answer [1]
53. June 2017 · Paper 1 · Q1 · 1 marks ·
1 Which atom is not an isotope of iodine? Number of neutrons Mass number A 72 125 B 74 127 C 75 128 D 77 129 Your answer [1]
54. June 2017 · Paper 1 · Q4 · 1 marks ·
4 Which calcium compound contains the greatest percentage by mass of calcium? A calcium carbonate B calcium nitrate C calcium hydroxide D calcium sulfate Your answer [1]
55. June 2017 · AS Paper 1 · Q22(a)(i) · 2 marks ·
22 This question is about elements from the s-block and p-block of the periodic table. (a) A sample of magnesium is analysed by mass spectrometry. The mass spectrum is shown below. 78.99% relative abundance (%) 10.00% 11.01% 21 22 23 24 25 26 27 28 29 m / z (i) The species causing the peaks in the mass spectrum are 1+ ions of magnesium. Complete the table to show the number of protons, neutrons and electrons in each 1+ ion of magnesium. m / z protons neutrons electrons 24 25 26 [2]
56. June 2017 · AS Paper 1 · Q22(a)(ii) · 2 marks ·
(ii) Calculate the relative atomic mass of the magnesium in the sample. Give your answer to two decimal places. relative atomic mass = .......................................................... [2]
57. June 2017 · AS Paper 1 · Q22(b) · 5 marks ·
(b) B and C are ionic compounds of two different Group 1 elements. The molar masses of B and C are both approximately 140 g mol–1. A student dissolves B and C in water in separate test tubes and analyses the solutions. The observations are shown below. Observation Test B(aq) C(aq) Addition of HNO3(aq) bubbles no change followed by BaCl2(aq) no change white precipitate Use this information and the observations to identify the formulae of B and C. Explain your reasoning. ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [5]
58. June 2017 · Paper 2 · Q18(b)(ii) · 1 marks ·
(ii) A sample of Nylon 6,6 has a relative molecular mass of 21500. Estimate the number of repeat units in the sample. Give your answer as a whole number. number of repeat units = ......................................................... [1]
59. June 2017 · Paper 3 · Q4(c)(ii) · 2 marks ·
(ii) A typical tablet of chromium(III) picolinate contains 200 μg of chromium. Calculate the mass, in g, of chromium(III) picolinate in a typical tablet. 1 μg = 10−6 g. Give your answer to three significant figures. mass = ...................................................... g [2]
60. June 2016 · AS Paper 1 · Q1 · 1 marks ·
1 Which row shows the atomic structure of 37Cl–? protons neutrons electrons A 17 18 20 B 17 20 18 C 18 19 17 D 20 17 21 Your answer [1]
61. June 2016 · AS Paper 1 · Q21(a) · 2 marks · AO1
12 SECTION B Answer all the questions. 21 A twenty pence coin contains copper and nickel. (a) Copper and nickel each exist as a mixture of isotopes. State the similarities and differences between the atomic structure of isotopes of the same element. Similarities ................................................................................................................................ ................................................................................................................................................... Differences ................................................................................................................................ ................................................................................................................................................... [2]
62. June 2016 · AS Paper 1 · Q21(b)(i) · 2 marks · AO1
(b) The copper used to make a batch of coins is analysed by mass spectrometry. The mass spectrum is shown below. 69.17% relative abundance (%) 30.83% 60 61 62 63 64 65 66 67 68 m / z (i) Calculate the relative atomic mass of the copper used to make the coins. Give your answer to two decimal places. relative atomic mass = .......................................................... [2]

Mark schemes

1. June 2025 · Paper 1 · Q1
Mark scheme June 2025 Paper 1 Q1
2. June 2025 · AS Paper 1 · Q5
Mark scheme June 2025 Paper 1 Q5
3. June 2025 · AS Paper 1 · Q21(a)
Mark scheme June 2025 Paper 1 Q21(a)
4. June 2025 · AS Paper 1 · Q21(b)
Mark scheme June 2025 Paper 1 Q21(b)
5. June 2025 · Paper 3 · Q1(a)(i)
Mark scheme June 2025 Paper 3 Q1(a)(i)
6. June 2025 · Paper 3 · Q1(a)(ii)
Mark scheme June 2025 Paper 3 Q1(a)(ii)
7. June 2024 · AS Paper 1 · Q2
Mark scheme June 2024 Paper 1 Q2
8. June 2024 · AS Paper 1 · Q21(a)
Mark scheme June 2024 Paper 1 Q21(a)
9. June 2024 · Paper 1 · Q22(b)(ii)
Mark scheme June 2024 Paper 1 Q22(b)(ii)
10. June 2024 · Paper 2 · Q22(a)
Mark scheme June 2024 Paper 2 Q22(a)
11. June 2024 · Paper 3 · Q2(c)(iii)
Mark scheme June 2024 Paper 3 Q2(c)(iii)
12. June 2024 · Paper 3 · Q4(c)(ii)
Mark scheme June 2024 Paper 3 Q4(c)(ii)
13. June 2023 · AS Paper 2 · Q1(a)(i)
Mark scheme June 2023 Paper 2 Q1(a)(i)
14. June 2023 · AS Paper 2 · Q1(a)(iii)
Mark scheme June 2023 Paper 2 Q1(a)(iii)
15. June 2023 · Paper 2 · Q16(b)(iii)
Mark scheme June 2023 Paper 2 Q16(b)(iii)
16. June 2023 · Paper 3 · Q4(b)(i)
Mark scheme June 2023 Paper 3 Q4(b)(i)
17. June 2023 · Paper 3 · Q4(c)(i)
Mark scheme June 2023 Paper 3 Q4(c)(i)
18. June 2023 · Paper 3 · Q6(c)(ii)
Mark scheme June 2023 Paper 3 Q6(c)(ii)
19. June 2022 · AS Paper 1 · Q22(a)
Mark scheme June 2022 Paper 1 Q22(a)
20. June 2022 · AS Paper 1 · Q22(b)
Mark scheme June 2022 Paper 1 Q22(b)
21. June 2022 · AS Paper 1 · Q24(b)
Mark scheme June 2022 Paper 1 Q24(b)
22. June 2022 · Paper 2 · Q8
Mark scheme June 2022 Paper 2 Q8
23. June 2022 · Paper 2 · Q19(d)(ii)
Mark scheme June 2022 Paper 2 Q19(d)(ii)
24. June 2022 · Paper 3 · Q1(b)(i)
Mark scheme June 2022 Paper 3 Q1(b)(i)
25. June 2022 · Paper 3 · Q1(b)(ii)
Mark scheme June 2022 Paper 3 Q1(b)(ii)
26. November 2021 · AS Paper 1 · Q21(b)
Mark scheme November 2021 Paper 1 Q21(b)
27. November 2021 · AS Paper 1 · Q21(c)
Mark scheme November 2021 Paper 1 Q21(c)
28. November 2021 · AS Paper 2 · Q3(c)
Mark scheme November 2021 Paper 2 Q3(c)
29. November 2020 · Paper 1 · Q16(a)
Mark scheme November 2020 Paper 1 Q16(a)
30. November 2020 · AS Paper 1 · Q21(b)
Mark scheme November 2020 Paper 1 Q21(b)
31. November 2020 · AS Paper 1 · Q21(c)(i)
Mark scheme November 2020 Paper 1 Q21(c)(i)
32. November 2020 · AS Paper 1 · Q21(c)(ii)
Mark scheme November 2020 Paper 1 Q21(c)(ii)
33. November 2020 · Paper 2 · Q21(b)(iii)
Mark scheme November 2020 Paper 2 Q21(b)(iii)
34. November 2020 · Paper 3 · Q4(b)(ii)
Mark scheme November 2020 Paper 3 Q4(b)(ii)
35. June 2019 · AS Paper 1 · Q3
Mark scheme June 2019 Paper 1 Q3
36. June 2019 · Paper 1 · Q3
Mark scheme June 2019 Paper 1 Q3
37. June 2019 · Paper 1 · Q16(b)
Mark scheme June 2019 Paper 1 Q16(b)
38. June 2019 · Paper 1 · Q18(c)(iii)
Mark scheme June 2019 Paper 1 Q18(c)(iii)
39. June 2019 · AS Paper 1 · Q21(a)
Mark scheme June 2019 Paper 1 Q21(a)
40. June 2019 · AS Paper 1 · Q21(b)
Mark scheme June 2019 Paper 1 Q21(b)
41. June 2019 · AS Paper 2 · Q1(a)(i)
Mark scheme June 2019 Paper 2 Q1(a)(i)
42. June 2019 · AS Paper 2 · Q1(a)(ii)
Mark scheme June 2019 Paper 2 Q1(a)(ii)
43. June 2019 · Paper 2 · Q18(d)
Mark scheme June 2019 Paper 2 Q18(d)
44. June 2019 · Paper 3 · Q1(b)
Mark scheme June 2019 Paper 3 Q1(b)
45. June 2019 · Paper 3 · Q6(a)(i)
Mark scheme June 2019 Paper 3 Q6(a)(i)
46. June 2018 · Paper 1 · Q1
Mark scheme June 2018 Paper 1 Q1
47. June 2018 · AS Paper 1 · Q21(a)(i)
Mark scheme June 2018 Paper 1 Q21(a)(i)
48. June 2018 · AS Paper 1 · Q21(a)(ii)
Mark scheme June 2018 Paper 1 Q21(a)(ii)
49. June 2018 · AS Paper 2 · Q1(d)(ii)
Mark scheme June 2018 Paper 2 Q1(d)(ii)
50. June 2018 · AS Paper 2 · Q2(c)(ii)
Mark scheme June 2018 Paper 2 Q2(c)(ii)
51. June 2018 · Paper 3 · Q1(a)(vi)
Mark scheme June 2018 Paper 3 Q1(a)(vi)
52. June 2017 · AS Paper 1 · Q1
Mark scheme June 2017 Paper 1 Q1
53. June 2017 · Paper 1 · Q1
Mark scheme June 2017 Paper 1 Q1
54. June 2017 · Paper 1 · Q4
Mark scheme June 2017 Paper 1 Q4
55. June 2017 · AS Paper 1 · Q22(a)(i)
Mark scheme June 2017 Paper 1 Q22(a)(i)
56. June 2017 · AS Paper 1 · Q22(a)(ii)
Mark scheme June 2017 Paper 1 Q22(a)(ii)
57. June 2017 · AS Paper 1 · Q22(b)
Mark scheme June 2017 Paper 1 Q22(b)
58. June 2017 · Paper 2 · Q18(b)(ii)
Mark scheme June 2017 Paper 2 Q18(b)(ii)
59. June 2017 · Paper 3 · Q4(c)(ii)
Mark scheme June 2017 Paper 3 Q4(c)(ii)
60. June 2016 · AS Paper 1 · Q1
Mark scheme June 2016 Paper 1 Q1
61. June 2016 · AS Paper 1 · Q21(a)
Mark scheme June 2016 Paper 1 Q21(a)
62. June 2016 · AS Paper 1 · Q21(b)(i)
Mark scheme June 2016 Paper 1 Q21(b)(i)