Amount of substance: AQA A‑Level Chemistry questions

Every AQA A-Level Chemistry exam question on 3.1.2 Amount of substance, 2016–2025, with its mark scheme and examiner’s report.

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Q03.7
June 2025 · Paper 1
1 mark3.1.2 Amount of substance
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Q03.8
June 2025 · Paper 1
7 marks3.1.2 Amount of substance 3.1.7 Oxidation, reduction and redox equations
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Q05.2
June 2025 · Paper 2
4 marks3.1.2 Amount of substance
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Q08.1
June 2025 · Paper 2
5 marks3.1.2 Amount of substance
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Q08.2
June 2025 · Paper 2
3 marks3.1.2 Amount of substance
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Q08.3
June 2025 · Paper 2
1 mark3.1.2 Amount of substance
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Q08.4
June 2025 · Paper 2
4 marks3.1.2 Amount of substance
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Q01.1
June 2025 · AS Paper 1
2 marks3.1.2 Amount of substance
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Q01.2
June 2025 · AS Paper 1
1 mark3.1.2 Amount of substance
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Q05.1
June 2025 · AS Paper 1
5 marks3.1.2 Amount of substance
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Q05.2
June 2025 · AS Paper 1
1 mark3.1.2 Amount of substance
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Q05.3
June 2025 · AS Paper 1
8 marks3.1.2 Amount of substance
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Q08
June 2025 · AS Paper 1
1 mark3.1.2 Amount of substance
Mark scheme (PDF)
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Q09
June 2025 · AS Paper 1
1 mark3.1.2 Amount of substance
Mark scheme (PDF)
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Q10
June 2025 · AS Paper 1
1 mark3.1.2 Amount of substance
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Q13
June 2025 · AS Paper 1
1 mark3.1.2 Amount of substance
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Q21
June 2025 · AS Paper 1
1 mark3.1.2 Amount of substance
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Q22
June 2025 · AS Paper 1
1 mark3.1.2 Amount of substance
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Q05.2
June 2025 · AS Paper 2
5 marks3.1.2 Amount of substance
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Q06.3
June 2025 · AS Paper 2
2 marks3.1.2 Amount of substance
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All 252 questions on Amount of substance, as a list

June 2025, Paper 1, Q03.7 (1 mark): Calculate the mean titre from the student’s results. [1 mark] cm3
June 2025, Paper 1, Q03.8 (7 marks): Calculate the Mr of M2[Cu(C2O4)2(H2O)2] Identify M. [7 marks] Mr of M2[Cu(C2O4)2(H2O)2] Identity of M
June 2025, Paper 2, Q05.2 (4 marks): The yield of TNT in this reaction is 42.5%. Calculate the mass, in g, of TNT (Mr = 227.0) obtained from 1050 cm3 of methylbenzene. Methylbenzene has density = 0
June 2025, Paper 2, Q08.1 (5 marks): Use the results to determine an experimental value for the Mr of Y. The gas constant, R = 8.31 J K–1 mol–1 Show your working. [5 marks] Mr
June 2025, Paper 2, Q08.2 (3 marks): The percentage uncertainty in the volume of Y in the gas syringe is 0.95% The percentage uncertainty in the temperature is 0.12% The uncertainty in each balance
June 2025, Paper 2, Q08.3 (1 mark): A teacher suggests placing a seal over the needle of the hypodermic syringe after collecting the sample of liquid Y, and then replacing the seal after injecting
June 2025, Paper 2, Q08.4 (4 marks): A mixture of methane and propane has a volume of 40 cm3 This mixture needs exactly 170 cm3 of oxygen for complete combustion. The equations for these reactions
June 2025, AS Paper 1, Q01.1 (2 marks): Calculate the percentage atom economy to form TiCl4 in this first stage of the extraction. [2 marks] Percentage atom economy
June 2025, AS Paper 1, Q01.2 (1 mark): Suggest one economic advantage of using a process with a high percentage atom economy. [1 mark]
June 2025, AS Paper 1, Q05.1 (5 marks): Calculate the relative molecular mass of H2A [5 marks] Relative molecular mass of H2A
June 2025, AS Paper 1, Q05.2 (1 mark): The uncertainty in the use of the burette in each titration is ±0.15 cm3 Calculate the percentage uncertainty in the use of the burette in titration 1. [1 mark]
June 2025, AS Paper 1, Q05.3 (8 marks): Suggest one way to reduce the percentage uncertainty in each titration without changing the apparatus. Justify your answer. [2 marks] Suggestion Justification 0
June 2025, AS Paper 1, Q08 (1 mark): What is the formula of gallium sulfate(VI)? [1 mark] A Ga2(SO4)3 B Ga3(SO4)2 C Ga2(SO3)3 D GaSO4
June 2025, AS Paper 1, Q09 (1 mark): What is the mass, in kg, of 2000 m3 of carbon monoxide gas at 100 kPa and 25 °C? R = 8.31 J K–1 mol–1 [1 mark] A 2.261 B 2.696 C 2261 D 2696
June 2025, AS Paper 1, Q10 (1 mark): What is the percentage by mass of sodium in sodium sulfate(VI)? [1 mark] A 19.3 B 22.3 C 32.4 D 36.5
June 2025, AS Paper 1, Q13 (1 mark): What is the maximum mass of sodium chloride that can be made from 10.0 g of sodium and 10.0 g of chlorine? [1 mark] A 8.24 g B 16.5 g C 20.0 g D 25.4 g
June 2025, AS Paper 1, Q21 (1 mark): A student is asked to prepare a solution of hydrochloric acid with a concentration of 0.0400 mol dm–3 What volume of distilled water should the student add to 2
June 2025, AS Paper 1, Q22 (1 mark): At temperature T and pressure P, 0.287 g of nitrogen has a volume of 25.0 cm3 Which quantity of substance at temperature T and pressure P contains the same numb
June 2025, AS Paper 2, Q05.2 (5 marks): A student does an experiment to determine the Mr of a volatile liquid X. In this experiment a conical flask of known volume is filled with vaporised X which is
June 2025, AS Paper 2, Q06.3 (2 marks): Concentrated phosphoric acid (H3PO4) has a density of 1.69 g cm–3 The concentrated acid contains 85% phosphoric acid and 15% water by mass. Calculate the amount
June 2024, Paper 1, Q02.4 (1 mark): The diagrams in Figure 2 show the part of a pipette with the graduation line. Which diagram identifies the pipette that is correctly filled? [1 mark] Tick () o
June 2024, Paper 1, Q02.5 (6 marks): Solubility can be quoted as ‘g of solute per 100 cm3 of solution’. Table 1 shows the results of the titrations between strontium hydroxide and hydrochloric acid
June 2024, Paper 1, Q06.4 (4 marks): 0.151 g of impure NH4VO3 is added to dilute sulfuric acid to form a solution containing aqueous VO2+ ions. All the VO3– ions are converted to VO2+ ions. These V
June 2024, Paper 1, Q09.4 (6 marks): A metal nitrate X(NO3)2 completely decomposes when heated. 2 X(NO3)2(s) → 2 XO(s) + 4 NO2(g) + O2(g) A 0.832 g sample of X(NO3)2 decomposes on heating to produc
June 2024, Paper 2, Q03.4 (4 marks): A sample of butane has a volume of 20 cm3 at room temperature and pressure. The sample is burned completely in 1350 cm3 of air. The final mixture is cooled to r
June 2024, Paper 2, Q07 (4 marks): Compound L (Mr = 88.0) contains carbon, hydrogen and oxygen only. A 6.56 × 10–4 mol sample of L burns completely in air to form 2.62 × 10–3 mol of water and 2.6
June 2024, Paper 3, Q08 (1 mark): Compound P is converted into compound R by a two-stage synthesis via compound Q. The yields for the individual steps are: P → Q 50% Q → R 30% What is the overal
June 2024, Paper 3, Q09 (1 mark): What is the formula of ammonium ethanedioate? [1 mark] A NH4(C2O4)2 B (NH4)2C2O4 C NH4C2O4 D (NH4)2(C2O4)3
June 2024, AS Paper 1, Q07.1 (1 mark): Each reading from the balance has an uncertainty of ±0.005 g Calculate the percentage uncertainty in using the balance in this experiment. [1 mark] Percentage u
June 2024, AS Paper 1, Q07.2 (1 mark): Calculate the amount, in moles, of hydrochloric acid that was added to the tablets in Step 3. Give your answer to an appropriate precision. [1 mark] Amount of h
June 2024, AS Paper 1, Q07.3 (6 marks): Use your answer to Question 07.2 and the information given to calculate the percentage by mass of magnesium oxide in the tablets. [6 marks] Percentage by mass o
June 2024, AS Paper 1, Q10 (1 mark): What is the percentage atom economy for the formation of sodium nitrate in the reaction between sodium carbonate and nitric acid? Na2CO3 + 2 HNO3 → 2 NaNO3 + H2
June 2024, AS Paper 1, Q12 (1 mark): The table shows some results from a titration. Titration Rough Titre 1 Titre 2 Titre 3 Initial reading / cm3 0.00 11.30 0.00 8.55 Final reading / cm3 26.85 37.2
June 2024, AS Paper 1, Q17 (1 mark): Ammonia is oxidised as shown. w NH3 + x O2 → y H2O + z NO Which whole number values for w, x, y and z balance the equation? [1 mark] w x y z A 2 3 3 2 B 4 7 4 4
June 2024, AS Paper 1, Q18 (1 mark): What is the empirical formula of an oxide of chlorine that contains 42.5% by mass of chlorine? [1 mark] A ClO2 B ClO3 C Cl2O3 D Cl2O5
June 2024, AS Paper 1, Q23 (1 mark): Which of these practical steps will improve the accuracy of a titration? [1 mark] A Using a 10.0 cm3 pipette instead of a 25.0 cm3 pipette. B Rinsing the sides
June 2024, AS Paper 2, Q01.2 (3 marks): 0.500 g of a hydrocarbon is analysed. The hydrocarbon contains 0.450 g of carbon. Calculate the empirical formula of this hydrocarbon. [3 marks] Empirical formu
June 2024, AS Paper 2, Q05.1 (7 marks): Magnesium reacts with hydrochloric acid. Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) 0.400 g of magnesium is added to 20.0 cm3 of 1.50 mol dm–3 hydrochloric acid. Ide
June 2024, AS Paper 2, Q05.2 (2 marks): Propane (C3H8) undergoes complete combustion in a plentiful supply of oxygen. Give an equation for the complete combustion of propane. Use this equation to calc
June 2024, AS Paper 2, Q08 (1 mark): The equation shows how P reacts with Q to make R and S. P + 2 Q → R + S When a mixture of 0.25 mol of P and 0.40 mol of Q react, 0.15 mol of R is obtained. What
June 2024, AS Paper 2, Q09 (1 mark): What is the Mr of this compound? [1 mark] A 94.0 B 96.0 C 98.0 D 100.0
June 2024, AS Paper 2, Q21 (1 mark): This is the equation for the conversion of 1,2-dibromoethane to butanedinitrile. CH2BrCH2Br + 2 KCN → NCCH2CH2CN + 2 KBr What is the percentage atom economy for
June 2024, AS Paper 2, Q22 (1 mark): A sample of cyclohexane contains 3.011 × 1024 atoms of carbon. What is the mass of this sample? The Avogadro constant, L = 6.022 × 1023 mol–1 [1 mark] A 70.0 g
June 2023, Paper 1, Q06.1 (1 mark): Calculate the mass, in g, of solid barium hydroxide (Mr = 171.3) needed to prepare 250 cm3 of 0.100 mol dm–3 barium hydroxide solution. [1 mark] Mass g
June 2023, Paper 1, Q06.2 (3 marks): The mass of barium hydroxide from Question 06.1 is dissolved in a beaker containing 150 cm3 of distilled water. Describe how this solution is used to make 250 c
June 2023, Paper 1, Q06.3 (1 mark): Before the first titration, the 25 cm3 pipette is rinsed with a small volume of the 0.100 mol dm–3 barium hydroxide solution. State why it is good practice to r
June 2023, Paper 1, Q06.4 (1 mark): Hydrochloric acid is added to the burette using a funnel. State why it is good practice to remove the funnel from the burette before the titration. [1 mark]
June 2023, Paper 1, Q06.5 (3 marks): In a different experiment, 0.952 g of solid barium hydroxide is used to make 250 cm3 of standard barium hydroxide solution. 25.0 cm3 of this barium hydroxide so
June 2023, Paper 1, Q06.6 (1 mark): The uncertainty in the 25.0 cm3 of solution from the pipette is ±0.05 cm3 The total uncertainty in the 24.50 cm3 of solution from the burette is ±0.15 cm3 Calcu
June 2023, Paper 1, Q07.8 (7 marks): Hydrated aluminium sulfate, Al2(SO4)3.xH2O, is soluble in water. The relative formula mass and value of x can be found from a titration experiment. Aqueous [Al(
June 2023, Paper 2, Q07.1 (4 marks): Calculate the volume, in cm3, of propanone in the gas syringe. The gas constant, R = 8.31 J K−1 mol−1 [4 marks] Volume of propanone cm3
June 2023, Paper 2, Q07.2 (2 marks): The gas syringe is then cooled to 75 °C, without changing the pressure. Calculate the decrease in volume. (If you were unable to calculate the volume in Questio
June 2023, Paper 2, Q07.3 (2 marks): The total uncertainty in using the balance to measure the mass of propanone in Question 07.1 is ±0.001 g Calculate the uncertainty that this causes in the volum
June 2023, Paper 2, Q07.4 (2 marks): A 600 cm3 sample of propanone is mixed with 2800 cm3 of oxygen in a container at 60 °C and 100 kPa. The mixture is ignited. When the reaction is complete, the r
June 2023, Paper 2, Q08.4 (3 marks): A sample of a different biofuel, made from sewage sludge, is found to contain 37.08% carbon, 5.15% hydrogen and 24.72% oxygen by mass. The rest of the sample is
June 2023, Paper 3, Q01.7 (5 marks): A student uses the method to prepare some ethyl ethanoate. The student adds 10.0 cm3 of ethanol (Mr = 46.0) to 5.25 g of ethanoic acid (Mr = 60.0) and obtains 5
June 2023, Paper 3, Q06.1 (2 marks): Show, by calculation, that the calcium hydroxide is in excess. [2 marks]
June 2023, Paper 3, Q08 (1 mark): What is the relative molecular mass (Mr) of benzene-1,4-dicarboxylic acid? [1 mark] A 164.0 B 166.0 C 168.0 D 170.0
June 2023, AS Paper 1, Q02.6 (6 marks): Mg(OH)2 is used as an antacid to treat indigestion. A student does an experiment to determine the percentage by mass of Mg(OH)2 in an indigestion tablet. 40.0 c
June 2023, AS Paper 1, Q03.1 (3 marks): Suggest three improvements to this method. [3 marks] 1 2 3
June 2023, AS Paper 1, Q03.2 (1 mark): A different student uses the correct method to prepare 250 cm3 of sodium carbonate solution in a volumetric flask. The uncertainty for the volumetric flask is ±
June 2023, AS Paper 1, Q04 (5 marks): M is a Group 2 metal that forms the nitrate M(NO3)2 0.320 g of M(NO3)2 is heated strongly and decomposes completely. 2 M(NO3)2 (s) → 2 MO (s) + 4 NO2 (g) + O2 (
June 2023, AS Paper 1, Q10 (1 mark): Which suggestion improves the accuracy of the titres? [1 mark] A Rinsing the conical flask with vinegar between each titration. B Rinsing the conical flask with
June 2023, AS Paper 1, Q11 (1 mark): Which suggestion decreases the percentage uncertainty in the mean titre? [1 mark] A Use a more dilute solution of sodium hydroxide in the burette. B Use a more
June 2023, AS Paper 1, Q12 (1 mark): Which reaction has the highest percentage atom economy for the production of hydrogen? [1 mark] A LiH + H2O → LiOH + H2 B CO + H2O → CO2 + H2 C 2 Al + 3 H2O → A
June 2023, AS Paper 2, Q07.3 (5 marks): In a similar experiment, 12.0 cm3 of 2,3,3-trimethylbutan-1-ol (Mr = 116.0) produces 6.12 g of 2,3,3-trimethylbut-1-ene. Calculate the percentage yield. density
June 2023, AS Paper 2, Q17 (1 mark): What is the minimum volume, in dm3, of air needed for the complete combustion of 1 dm3 of methane? Assume that air contains 20% of oxygen by volume. Assume that
June 2023, AS Paper 2, Q20 (1 mark): Which compound has the greatest Mr? [1 mark] A B C D
June 2023, AS Paper 2, Q21 (1 mark): Which compound has the empirical formula C2H4O? [1 mark] A butanal B ethanoic acid C ethanol D methylpropanoic acid
June 2023, AS Paper 2, Q23 (1 mark): What is the atom economy for the formation of ethylamine in this reaction? CH3CH2Br + 2 NH3 → CH3CH2NH2 + NH4Br [1 mark] A 31.5% B 35.7% C 36.1% D 41.3%
June 2022, Paper 1, Q03.1 (5 marks): Give an ionic equation for the reaction between potassium manganate(VII) and acidified hydrogen peroxide. Calculate the concentration, in mol dm–3, of hydrogen
June 2022, Paper 1, Q03.4 (5 marks): Hydrogen peroxide decomposes to form water and oxygen. Give an equation for this reaction. Calculate the amount, in moles, of hydrogen peroxide that would be ne
June 2022, Paper 2, Q05.6 (4 marks): Calculate the mass, in g, of hexan-2-ol formed from 11.0 cm3 of hex-1-ene if the yield is 31.0% Give your answer to 1 decimal place. Density of hex-1-ene = 0.67
June 2022, Paper 2, Q09.1 (2 marks): A suitable target titre for the titration is 30.0 cm3 of 0.025 mol dm−3 Br2(aq). Justify why a much smaller target titre would not be appropriate. Calculate the
June 2022, Paper 2, Q09.2 (5 marks): Calculate a suitable mass of olive oil to transfer to the volumetric flask using your answer to Question 09.1 and the structure of Y. Assume that the olive oil
June 2022, Paper 2, Q09.3 (2 marks): Suggest an extra step to ensure that the mass of olive oil in the solution is recorded accurately. Justify your suggestion. [2 marks] Extra step Justification
June 2022, Paper 2, Q09.4 (1 mark): State the reason for inverting the flask several times. [1 mark]
June 2022, Paper 3, Q02 (6 marks): Tschermigite is a hydrated, water-soluble mineral, with relative formula mass of 453.2 The formula of tschermigite can be represented as M.x H2O, where M repres
June 2022, Paper 3, Q07 (1 mark): Complete combustion of 0.0100 mol of an organic acid produced 0.0200 mol of carbon dioxide. The same amount of the acid required 20 cm3 of 1.00 mol dm–3 NaOH (a
June 2022, AS Paper 1, Q02.1 (2 marks): A student makes a solution of citric acid by dissolving some solid citric acid in water. Describe a method to add an accurately known mass of solid to a beaker
June 2022, AS Paper 1, Q02.2 (3 marks): The student dissolves 0.834 g of citric acid in water and makes the solution up to 500 cm3 Calculate the concentration, in mol dm–3, of citric acid in this solu
June 2022, AS Paper 1, Q02.3 (6 marks): The student uses this method to complete a titration. • Rinse a burette with distilled water. • Fill the burette with sodium hydroxide solution. • Use a measuri
June 2022, AS Paper 1, Q02.4 (2 marks): Table 1 shows the student’s burette readings after the mistakes in the practical procedure have been corrected. Table 1 Rough Run 1 Run 2 Run 3 Final reading /
June 2022, AS Paper 1, Q02.5 (1 mark): The total uncertainty in the use of the burette is ±0.15 cm3 Calculate the percentage uncertainty in the use of the burette in Run 1. [1 mark] Percentage uncert
June 2022, AS Paper 1, Q14 (1 mark): 5.0 g of an oxide contains 4.0 g of molybdenum. What is the empirical formula of this oxide? [1 mark] A MoO2 B MoO5 C Mo2O3 D Mo3O2
June 2022, AS Paper 2, Q03.5 (4 marks): Several saturated halogenoalkanes contain 17.8% carbon, 3.0% hydrogen and 79.2% bromine by mass. Calculate the empirical formula of these compounds. Give the IU
June 2022, AS Paper 2, Q04.1 (5 marks): TNT (C7H5N3O6) is an explosive because it can decompose very quickly and exothermically to form a large volume of gas. An equation for this decomposition is 2 C
June 2022, AS Paper 2, Q04.2 (1 mark): Alkenes have the general formula CnH2n When alkenes undergo complete combustion, 1.0 mol of CnH2n reacts with 3n 2 mol of oxygen. Calculate the volume of oxygen
June 2022, AS Paper 2, Q04.3 (1 mark): Alkanes have the general formula CnH2n+2 Alkanes undergo complete combustion in a plentiful supply of oxygen. CnH2n+2 + x O2 → n CO2 + (n+1) H2O Determine x in
June 2022, AS Paper 2, Q05.2 (2 marks): 1-iodopropane is a liquid at room temperature. Calculate the number of molecules in 5.0 cm3 of 1-iodopropane (Mr = 169.9). Give your answer in standard form. Fo
June 2022, AS Paper 2, Q05.3 (2 marks): In an experiment, 10.3 g of 1-iodopropane (Mr = 169.9) are reacted with an excess of ammonia. 2.3 g of propylamine (Mr = 59.0) are produced. Calculate the perce
June 2022, AS Paper 2, Q06.1 (2 marks): The equation for a process used to manufacture CCl3F is SbF3Br2 + CCl4 → CCl3F + SbF2Br2Cl Calculate the percentage atom economy for the production of CCl3F in
June 2022, AS Paper 2, Q17 (1 mark): Which compound has the same empirical formula and molecular formula? [1 mark] A butane B but-1-ene C propane D propene Questions 18, 19 and 20 Methanol is made
November 2021, Paper 1, Q04.4 (6 marks): Iron reacts with dilute hydrochloric acid to form iron(II) chloride and hydrogen. Fe(s) + 2 HCl(aq) → FeCl2(aq) + H2(g) A 0.998 g sample of pure iron is added t
November 2021, Paper 2, Q01.3 (6 marks): A 1.450 g sample of coconut oil is heated with 0.421 g of KOH in aqueous ethanol until all of the triester is hydrolysed. The mixture is cooled. The remaining K
November 2021, Paper 3, Q01.3 (4 marks): Sodium ethanedioate is used to find the concentration of solutions of potassium manganate(VII) by titration. The equation for this reaction is 2 MnO4– + 16 H+ +
November 2021, Paper 3, Q01.4 (1 mark): Figure 1 shows the 25.0 cm3 pipette used to measure the sodium ethanedioate solution. Figure 1 On Figure 1, draw the meniscus of the solution when the pipette i
November 2021, Paper 3, Q01.5 (2 marks): Potassium manganate(VII) is oxidising and harmful. Sodium ethanedioate is toxic. Suggest safety precautions, other than eye protection, that should be taken whe
November 2021, Paper 3, Q01.7 (2 marks): Figure 2 shows the burette containing potassium manganate(VII) solution. Figure 2 Give two practical steps needed before recording the initial burette reading.
November 2021, Paper 3, Q25 (1 mark): Which compound needs the greatest amount of oxygen for the complete combustion of 1 mol of the compound? [1 mark] A ethanal B ethanol C ethane-1,2-diol D methan
November 2021, Paper 3, Q29 (1 mark): Nitration of 1.70 g of methyl benzoate (Mr = 136.0) produces methyl 3-nitrobenzoate (Mr = 181.0). The percentage yield is 65.0% What mass, in g, of methyl 3-nit
November 2021, AS Paper 1, Q06 (5 marks): Calcium sulfide reacts with calcium sulfate as shown. CaS + 3 CaSO4 → 4 CaO + 4 SO2 2.50 g of calcium sulfide are heated with 9.85 g of calcium sulfate until th
November 2021, AS Paper 1, Q08.1 (6 marks): Use the results in Table 3 to calculate the mean titre value. Use the mean titre to calculate the percentage by mass of sodium ethanoate in the original sample.
November 2021, AS Paper 1, Q08.2 (2 marks): The student rinses the burette with deionised water before filling with sodium hydroxide solution. State and explain the effect, if any, that this rinsing will
November 2021, AS Paper 1, Q10.3 (5 marks): At a different temperature, a mixture contains 0.025 mol of sulfur dioxide 0.049 mol of oxygen 0.034 mol of sulfur trioxide. The total pressure of the mixture i
November 2021, AS Paper 2, Q03.2 (4 marks): The student reacts 2.0 cm3 of propan-2-ol (CH3CH(OH)CH3) with an excess of acidified potassium dichromate(VI). The student obtains 0.954 g of propanone (CH3COCH
November 2021, AS Paper 2, Q04.3 (2 marks): A typical refrigerator contained 0.50 kg of CFC-11 (Mr = 137.5). One molecule of CFC-11 causes the destruction of approximately 100 000 molecules of ozone. Use
November 2021, AS Paper 2, Q06.1 (5 marks): In the first experiment, liquid Y is injected into a sealed flask under vacuum. The liquid vaporises in the flask. Table 2 shows data for this experiment. Table
November 2021, AS Paper 2, Q06.2 (2 marks): In the second experiment, another flask is used for a combustion reaction. Method • Remove all the air from the flask. • Add 0.0010 mol of 2,2,4-trimethylpentan
November 2021, AS Paper 2, Q10 (1 mark): A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen by mass. Which could be the molecular formula of this compound? [1 mark] A C2H2O2 B C2H2O C C2H
November 2021, AS Paper 2, Q11 (1 mark): When driving a car, a legal limit for ethanol (Mr = 46.0) is 80 mg per 100 cm3 of blood. What is this concentration in mol dm–3? [1 mark] A 1.74 × 10–1 B 1.74 ×
November 2021, AS Paper 2, Q23 (1 mark): What is the percentage atom economy for the production of ethanol from glucose? C6H12O6 → 2 C2H5OH + 2 CO2 [1 mark] A 25.6% B 27.1% C 51.1% D 54.2%
November 2020, Paper 1, Q08.1 (7 marks): Use all the information given to calculate the percentage by mass of NaClO in the original bleach solution. Give your answer to 3 significant figures. [7 marks]
November 2020, Paper 1, Q08.2 (1 mark): The total uncertainty from two readings and an end point error in using a burette is ± 0.15 cm3 What is the total percentage uncertainty in using the burette in
November 2020, Paper 2, Q04.5 (5 marks): A 6.01 g sample of salicylic acid (Mr = 138.0) is reacted with 10.5 cm3 of ethanoic anhydride (Mr = 102.0). In the reaction the yield of aspirin is 84.1% The de
November 2020, Paper 2, Q08.1 (5 marks): A 1.50 g sample of H3Y.𝑥𝑥H2O contains 0.913 g of oxygen by mass. The sample burns completely in air to form 1.89 g of CO2 and 0.643 g of H2O Show that the empir
November 2020, Paper 2, Q08.2 (2 marks): A 3.00 g sample of H3Y.𝑥𝑥H2O (Mr = 210.0) is heated to constant mass. The anhydrous H3Y that remains has a mass of 2.74 g Show, using these data, that the value
November 2020, Paper 3, Q07 (1 mark): When heated, a sample of potassium chlorate(V) (KClO3) produced 67.2 cm3 of oxygen, measured at 298 K and 110 kPa 2 KClO3(s) → 2 KCl(s) + 3 O2(g) What is the am
November 2020, Paper 3, Q36 (1 mark): A student rinsed the apparatus before starting an acid-base titration. The results of the titration showed that the volume of acid added from the burette was la
November 2020, AS Paper 1, Q02.1 (5 marks): Calculate the mass of sodium hydroxide used to make the original solution. [5 marks] Mass of sodium hydroxide g
November 2020, AS Paper 1, Q02.2 (1 mark): The student uses a funnel to fill the burette with sulfuric acid before starting the titration. After filling, the student forgets to remove the funnel from the
November 2020, AS Paper 1, Q02.3 (1 mark): State one advantage of using a conical flask rather than a beaker for the titration. [1 mark]
November 2020, AS Paper 1, Q07.4 (1 mark): Calculate the amount, in moles, of silver iodide obtained. Mr (AgI) = 234.8 [1 mark] Amount of silver iodide mol
November 2020, AS Paper 1, Q07.5 (1 mark): Calculate, using your answer to Question 07.4, the mass, in grams, of sodium iodide in the mixture. Mr (NaI) = 149.9 [1 mark] Mass of sodium iodide g
November 2020, AS Paper 1, Q07.6 (2 marks): Calculate, using your answer to Question 07.5, the percentage by mass of sodium chloride in the mixture. [2 marks] Percentage of sodium chloride
November 2020, AS Paper 1, Q08.1 (4 marks): A student does an experiment to determine the relative molecular mass (Mr) of liquid A using the apparatus shown in Figure 2. The student injects a sample of A
November 2020, AS Paper 1, Q08.2 (2 marks): The student noticed that some of the liquid injected into the gas syringe did not vaporise. Explain the effect that this has on the Mr calculated by the student
November 2020, AS Paper 1, Q08.3 (1 mark): Each reading on the balance used to record the mass of the fine needle syringe and contents had an uncertainty of ±0.001 g Calculate the percentage uncertainty
November 2020, AS Paper 2, Q03 (6 marks): A student investigates two experimental methods of making methylpropanal. The equations for these two methods are shown. In each method, the student uses 1.00 g
November 2020, AS Paper 2, Q07.3 (5 marks): Ethanedioic acid reacts with an excess of sodium hydroxide to form sodium ethanedioate. H2C2O4 (aq) + 2 NaOH (aq) → Na2C2O4 (aq) + 2 H2O (I) A student mixes 10.
November 2020, AS Paper 2, Q16 (1 mark): What is the empirical formula of a hydrocarbon that contains 90% carbon by mass? [1 mark] A C2H3 B C3H2 C C3H4 D C4H3
November 2020, AS Paper 2, Q17 (1 mark): Which compound has the lowest relative molecular mass? [1 mark] A ethanoic acid B 1-fluoropropane C propanenitrile D propylamine
November 2020, AS Paper 2, Q19 (1 mark): What is the minimum volume of 0.0500 mol dm–3 aqueous bromine needed to react completely with 0.0200 g of buta-1,3-diene? (Mr of buta-1,3-diene = 54.0) [1 mark]
June 2019, Paper 1, Q06.6 (4 marks): Iodine vaporises easily. Calculate the volume, in cm3, that 5.00 g of iodine vapour occupies at 185 °C and 100 kPa The gas constant R = 8.31 J K–1 mol–1 Give yo
June 2019, Paper 2, Q02.4 (5 marks): In this preparation, the student added an excess of concentrated phosphoric acid to 14.4 g of cyclohexanol (Mr = 100.0). The student obtained 4.15 cm3 of cycloh
June 2019, Paper 2, Q03.1 (4 marks): Deduce the molecular formula of isoprene and suggest a possible structure. [4 marks] Molecular formula Structure
June 2019, Paper 2, Q08.7 (3 marks): Calculate the mass, in kg, of hydroquinone (Mr = 110.0) needed to produce 250 kg of paracetamol. [3 marks] Mass kg
June 2019, Paper 2, Q10.2 (4 marks): A student dissolved some of the dicarboxylic acid from Question 10.1 in water and made up the solution to 250 cm3 in a volumetric flask. In a titration, a 25.0
June 2019, Paper 3, Q01.1 (1 mark): Give the simplest ionic equation for this reaction. [1 mark]
June 2019, Paper 3, Q05.2 (1 mark): The titration results are shown in Table 3. Table 3 1 2 3 Final volume / cm3 22.90 45.60 22.60 Initial volume / cm3 0.00 22.90 0.00 Titre / cm3 22.90 22.70 22.6
June 2019, Paper 3, Q05.5 (1 mark): Name the piece of apparatus used for these stages of the method. [1 mark] Taking the 25.0 cm3 portions Adding the potassium manganate(VII) solution
June 2019, Paper 3, Q05.6 (1 mark): The balance used to weigh the 680 mg of iron wire has an uncertainty of ±0.005 g A container was weighed and its mass was subtracted from the total mass of the
June 2019, Paper 3, Q06 (1 mark): Which amount of sodium hydroxide would react exactly with 7.5 g of a diprotic acid, H2A (Mr = 150)? [1 mark] A 50 cm3 of 0.05 mol dm–3 NaOH(aq) B 100 cm3 of 0.5
June 2019, Paper 3, Q07 (1 mark): Lead(II) nitrate and potassium iodide react according to the equation Pb(NO3)2(aq) + 2 KI(aq) → PbI2(s) + 2 KNO3(aq) In an experiment, 25.0 cm3 of a 0.100 mol d
June 2019, AS Paper 1, Q06.1 (5 marks): Use the results to calculate the Mr of H2A [5 marks] Mr of H2A
June 2019, AS Paper 1, Q06.2 (1 mark): The uncertainty in using the pipette in this experiment is ±0.06 cm3 Calculate the percentage uncertainty in using the pipette. [1 mark] % uncertainty
June 2019, AS Paper 1, Q06.3 (1 mark): Before adding the solution from the burette in the rough titration, there was an air bubble below the tap. At the end of this titration the air bubble was not t
June 2019, AS Paper 1, Q06.4 (1 mark): During the titration the student washed the inside of the conical flask with some distilled water. Suggest why this washing does not give an incorrect result. [
June 2019, AS Paper 1, Q07.2 (4 marks): A mixture of magnesium oxide and magnesium hydroxide has a mass of 3200 mg This mixture is reacted with carbon dioxide to form magnesium carbonate and water. Th
June 2019, AS Paper 1, Q09 (1 mark): Which sample, measured at room temperature and pressure, contains the greatest number of the stated particles? [1 mark] A 1 g of hydrogen molecules B 1 g of hel
June 2019, AS Paper 1, Q10 (1 mark): 5.0 g of an oxide of molybdenum contain 4.0 g of molybdenum. What is the empirical formula of this oxide? [1 mark] A MoO2 B Mo4O5 C Mo2O3 D Mo3O2
June 2019, AS Paper 1, Q21 (1 mark): The equation below represents the complete combustion of butane. C4H10(g) + 6 1 2 O2(g)  4 CO2(g) + 5 H2O(g) 20 cm3 of butane are completely burned in 0.20 dm3
June 2019, AS Paper 1, Q23 (1 mark): What is the percentage yield when 20 g of aluminium are produced from 50 g of aluminium oxide? 2Al2O3 → 4Al + 3O2 [1 mark] A 76% B 40% C 33% D 19%
June 2019, AS Paper 2, Q02.3 (2 marks): Calculate the percentage atom economy for the formation of D in this reaction. Give your answer to the appropriate number of significant figures. [2 marks] % at
June 2019, AS Paper 2, Q04.3 (2 marks): Sulfur dioxide is produced in the combustion of fossil fuels. The total emissions of sulfur dioxide in the UK have fallen dramatically since 1970. Sulfur dioxid
June 2019, AS Paper 2, Q07.2 (6 marks): Describe how to prepare 250 cm3 of an aqueous standard solution of propanedioic acid containing an accurately measured mass of the acid. Include essential pract
June 2019, AS Paper 2, Q07.3 (2 marks): Calculate the mass, in mg, of propanedioic acid (Mr = 104.0) needed to prepare 250 cm3 of a 0.00500 mol dm–3 solution. [2 marks] Mass of propanedioic acid mg
June 2019, AS Paper 2, Q08.1 (3 marks): Calculate the minimum volume, in cm3, of 0.40 mol dm–3 potassium dichromate(VI) solution needed to oxidise 6.0 cm3 of propan-1-ol to propanal. Mr of propan-1-ol
June 2019, AS Paper 2, Q09.3 (6 marks): Butane can be used as a replacement for CFCs in refrigerators. During its use, the butane is repeatedly converted from liquid to gas and then back to liquid. Li
June 2019, AS Paper 2, Q10 (1 mark): A ‘drink-driving’ offence is committed if the blood alcohol level of a driver is over 80 mg of ethanol per 100 cm3 of blood. What is the concentration, in mol d
June 2019, AS Paper 2, Q24 (1 mark): The heat released when 1.00 g of ethanol (Mr = 46.0) undergoes complete combustion is 29.8 kJ What is the heat released by each molecule, in joules, when ethano
June 2018, Paper 1, Q04.5 (3 marks): A student added 6 cm3 of 0.25 mol dm–3 barium chloride solution to 8 cm3 of 0.15 mol dm–3 sodium sulfate solution. The student filtered off the precipitate and
June 2018, Paper 1, Q08.2 (6 marks): When 250 mg of sodium were added to 500 cm3 of water at 25 °C a gas was produced. Give an equation for the reaction that occurs. Calculate the volume, in cm3, o
June 2018, Paper 1, Q08.3 (1 mark): Calculate the concentration, in mol dm–3, of sodium ions in the solution produced in the reaction in Question 08.2. [1 mark] Concentration mol dm–3
June 2018, Paper 1, Q10.1 (7 marks): A student added 627 mg of hydrated sodium carbonate (Na2CO3.xH2O) to 200 cm3 of 0.250 mol dm–3 hydrochloric acid in a beaker and stirred the mixture. After the
June 2018, Paper 3, Q03.1 (3 marks): The student collected 5.97 g of cyclohexene in the experiment. Calculate the percentage yield of cyclohexene. [3 marks] Percentage yield %
June 2018, Paper 3, Q05 (1 mark): Which can be both an empirical and molecular formula of a stable compound? [1 mark] A CH2O B P4O10 C NH2 D CH3
June 2018, AS Paper 1, Q02.1 (4 marks): A 1.00 g sample of toothpaste was found to contain 2.88 x 10–5 mol of sodium fluoride. Calculate the concentration of sodium fluoride, in ppm, for the sample of
June 2018, AS Paper 1, Q02.2 (1 mark): Sodium fluoride is toxic in high concentrations. Major health problems can occur if concentrations of sodium fluoride are greater than 3.19 x 10–2 g per kilogra
June 2018, AS Paper 1, Q02.3 (1 mark): The concentration of sodium fluoride in a prescription toothpaste is 2800 ppm. Use your answer to Question 02.2 to deduce the mass of toothpaste, in kg, that a
June 2018, AS Paper 1, Q03.1 (5 marks): Use the data in Table 1 to calculate a value for x in the formula Na2CO3. xH2O Give your answer to 2 decimal places. [5 marks] Value for x
June 2018, AS Paper 1, Q03.2 (1 mark): The correct value for x is 10 Suggest a reason for the difference between the experimental value for x and the correct value. (If you were unable to calculate a
June 2018, AS Paper 1, Q03.3 (2 marks): Suggest how the procedure could be improved, using the same apparatus, to give a more accurate value for x Justify your answer. [2 marks] Suggestion Justificati
June 2018, AS Paper 1, Q06.1 (5 marks): Define the term relative molecular mass (Mr). Use the experimental results in Table 2 to determine the relative molecular mass of Y. The gas constant R = 8.31 J
June 2018, AS Paper 1, Q06.2 (2 marks): Some of the liquid injected did not evaporate because it dripped into the gas syringe nozzle outside the oven. Explain how this would affect the value of the Mr
June 2018, AS Paper 1, Q07.4 (4 marks): The concentration of ClO– ions in bleach solution can be found by reaction with iodide ions. The overall equation for this reaction is shown. ClO– + 2I– + 2H+ →
June 2018, AS Paper 1, Q11 (1 mark): How many protons are there in 6.0 g of nitrogen gas? Avogadro constant, L = 6.022 x 1023 mol–1 [1 mark] A 1.3 x 1023 B 9.0 x 1023 C 1.8 x 1024 D 3.6 x 1024
June 2018, AS Paper 1, Q13 (1 mark): A 30 cm3 sample of nitrogen was reacted with a 60 cm3 sample of fluorine according to the equation N2(g) + F2(g) → NF3(g) What is the volume of the gas mixture
June 2018, AS Paper 1, Q19 (1 mark): A solution of volume 500 cm3 contains 150 g of ammonia. What is the concentration, in mol dm–3, of ammonia in this solution? [1 mark] A 0.51 B 8.82 C 16.7 D 17.
June 2018, AS Paper 1, Q20 (1 mark): Which suggestion would improve the chances of obtaining concordant titres? [1 mark] A Invert the volumetric flask several times after adding the distilled water
June 2018, AS Paper 1, Q21 (1 mark): Which suggestion about rinsing the conical flask between each titration would improve the accuracy of the titrations? [1 mark] A Rinsing with acid. B Rinsing wi
June 2018, AS Paper 1, Q22 (1 mark): Which suggestion would reduce the overall measurement uncertainty in the titration? [1 mark] A Use less concentrated alkali in the burette. B Use phenolphthalei
June 2018, AS Paper 1, Q23 (1 mark): Which of these is important in ensuring that the student’s experiment is safe? [1 mark] A Do the titration in a fume cupboard. B Wear gloves when measuring out
June 2018, AS Paper 1, Q24 (1 mark): Which colour change is observed at the end point in each titration? [1 mark] A Yellow to red B Red to orange C Yellow to orange D Red to yellow
June 2018, AS Paper 2, Q02.1 (1 mark): The student rinsed the burette before filling it with the sodium hydroxide solution. State why the student should use sodium hydroxide solution rather than wate
June 2018, AS Paper 2, Q02.2 (1 mark): The student carried out several titrations. The results are shown in Table 2. Complete Table 2 to show the titre in each titration. [1 mark] Table 2 Titration R
June 2018, AS Paper 2, Q02.3 (2 marks): Calculate the mean titre using the concordant results. Give your answer to the appropriate number of significant figures. [2 marks] Mean titre cm3
June 2018, AS Paper 2, Q02.4 (1 mark): The total uncertainty when using the burette is ±0.15 cm3. This is the combination of uncertainties in the start reading, final reading and the determination of
June 2018, AS Paper 2, Q02.5 (3 marks): Use your answer to Question 02.3 to find the mass, in mg, of citric acid dissolved in 250 cm3 of the solution. The relative molecular mass (Mr) of citric acid i
June 2018, AS Paper 2, Q02.6 (1 mark): Calculate the percentage purity of this sample of citric acid. [1 mark] Percentage purity %
June 2018, AS Paper 2, Q05.1 (6 marks): A hydrocarbon contains 87.8% by mass of carbon and has a relative molecular mass (Mr) of 82.0 The hydrocarbon decolourises bromine water. Determine the empirica
June 2018, AS Paper 2, Q09 (1 mark): A student has a 10 cm3 sample of 1.00 × 10−2 mol dm−3 methanoic acid solution. The student is asked to dilute the methanoic acid solution to a concentration of
June 2018, AS Paper 2, Q17 (1 mark): Ethanol can be made from glucose by fermentation. C6H12O6 → 2C2H5OH + 2CO2 In an experiment, 268 g of ethanol (Mr = 46.0) were made from 1.44 kg of glucose (Mr
June 2018, AS Paper 2, Q21 (1 mark): A gas cylinder contains 5.0 kg of propane. How many propane molecules are in the cylinder? The Avogadro constant, L = 6.022 × 1023 mol–1 [1 mark] A 6.8 × 1022 B
June 2018, AS Paper 2, Q22 (1 mark): Which sample of liquid has the greatest volume? [1 mark] A 500 mg of pentane (density = 0.63 g cm–3) B 650 mg of propan-1-ol (density = 0.80 g cm–3) C 1.20 g of
June 2017, Paper 1, Q11.1 (8 marks): A white solid is a mixture of sodium ethanedioate (Na2C2O4), ethanedioic acid dihydrate (H2C2O4.2H2O) and an inert solid. A volumetric flask contained 1.90 g of
June 2017, Paper 2, Q01.3 (3 marks): Calculate the mass, in grams, of CH3CH2CH2NH2 produced from 25.2 g of CH3CH2CH2Br in Reaction 2 assuming a 75.0% yield. Give your answer to the appropriate numb
June 2017, Paper 2, Q10.2 (5 marks): A sample of P was mixed with an excess of oxygen and the mixture ignited. After cooling to the original temperature, the total volume of gas remaining was 335 c
June 2017, Paper 3, Q03.2 (2 marks): Show, by calculation, that an excess of sodium hydroxide is used in this reaction. [2 marks] 10
June 2017, Paper 3, Q03.9 (3 marks): In a similar experiment, another student used 0.040 mol of ethyl benzoate and obtained 5.12 g of benzoic acid. Calculate the percentage yield of benzoic acid. S
June 2017, Paper 3, Q11 (1 mark): What is the mass, in mg, of carbon formed when 3.0 × 10−3 mol of propene undergoes incomplete combustion? 2C3H6 + 3O2 → 6C + 6H2O [1 mark] A 9.0 × 10−3 B 3.6 ×
June 2017, Paper 3, Q19 (1 mark): The equation for the reaction between zinc and hydrochloric acid is Zn + 2HCl → ZnCl2 + H2 What is the minimum mass, in mg, of zinc (Ar = 65.4) needed to react
June 2017, Paper 3, Q26 (1 mark): A solution of lead(ll) chloride (Mr = 278.2) contains 1.08 g of PbCl2 in 100 cm3 of solution. In this solution, the lead(ll) chloride is fully dissociated into
June 2017, Paper 3, Q30 (1 mark): A student is provided with 5.00 cm3 of 1.00 mol dm−3 ammonia solution. The student was asked to prepare an ammonia solution with a concentration of 0.050 mol dm
June 2017, Paper 3, Q33 (1 mark): Phenylethanone can be prepared by the reaction between ethanoyl chloride and benzene. In a preparation, with an excess of benzene, the mass of ethanoyl chloride
June 2017, Paper 3, Q34 (1 mark): 130 cm3 of oxygen and 40 cm3 of nitrogen, each at 298 K and 100 kPa, were placed into an evacuated flask of volume 0.50 dm3. What is the pressure of the gas mix
June 2017, AS Paper 1, Q06.1 (2 marks): Balance the equations for the two stages in this process. [2 mark ..…CuFeS2 + ..…O2 + ..…SiO2 → ..…Cu2S + ..…Cu2O + ..…SO2 + ..…FeSiO3 ……Cu2S + ……Cu2O → ……Cu +
June 2017, AS Paper 1, Q06.3 (4 marks): A passenger jet contains 4050 kg of copper wiring. A rock sample contains 1.25% CuFeS2 by mass. Calculate the mass, in tonnes, of rock needed to produce enough
June 2017, AS Paper 1, Q06.4 (2 marks): Copper can also be produced by the reaction of carbon with copper(II) oxide according to the equation 2CuO + C → 2Cu + CO2 Calculate the percentage atom economy
June 2017, AS Paper 1, Q14: A 4.85 g sample of anhydrous sodium sulfate is dissolved in water and the solution made up to 250 cm3 in a volumetric flask. What is the concentration in mol dm
June 2017, AS Paper 1, Q15: Which of these contains the greatest number of atoms? [1 mar A 127 mg of iodine B 1.54 × 10−4 kg of phosphorus C 81.0 mg of carbon dioxide D 1.70 × 10−4 kg of a
June 2017, AS Paper 1, Q16: 25.0 cm3 samples of NaOH solution were taken by pipette from a beaker. These were then titrated with an aqueous solution of ethanoic acid. The concentration o e
June 2017, AS Paper 1, Q17: A 20.0 cm3 sample of a 0.400 mol dm−3 aqueous solution of a metal bromide (MBrn) reacts exactly with 160 cm3 of 0.100 mol dm−3 aqueous silver nitrate. What is t
June 2017, AS Paper 1, Q22: What is the empirical formula of an oxide of nitrogen that contains 26% nitrogen by mass? [1 mar A NO2 B N2O3 C N2O5 D N4O5
June 2017, AS Paper 2, Q02.1 (5 marks): Calculate the relative molecular mass of X. Show your working. Give your answer to the appropriate number of significant figures. The gas constant, R = 8.31 J K
June 2017, AS Paper 2, Q02.2 (4 marks): Analysis of a different hydrocarbon Y shows that it contains 83.7% by mass of carbon. Calculate the empirical formula of Y. Use this empirical formula and the r
June 2017, AS Paper 2, Q05.1 (4 marks): The student found that 25.0 cm3 of the ethanedioic acid solution reacted completely with 25.30 cm3 of 0.500 mol dm−3 sodium hydroxide solution. Calculate the ma
June 2017, AS Paper 2, Q05.2 (1 mark): The student used a wash bottle containing deionised water when approaching the end-point to rinse the inside of the conical flask. Explain why this improved the
June 2017, AS Paper 2, Q05.3 (1 mark): Give the meaning of the term concordant titres. [1 mark]
June 2017, AS Paper 2, Q06.2 (3 marks): When 2.0 cm3 of 1-bromo-2-methylpropane (Mr = 136.9) were reacted with an excess of sodium hydroxide, 895 mg of 2-methylpropan-1-ol (Mr = 74.0) were obtained. T
June 2017, AS Paper 2, Q10 (1 mark): What is the burette reading for this transparent liquid? [1 mark] A 24.10 cm3 B 24.30 cm3 C 25.70 cm3 D 25.90 cm3
June 2017, AS Paper 2, Q11 (1 mark): A volumetric flask was used to prepare 250 cm3 of a solution. The solute was added from a plastic weighing container. Mass / g Weighing container with solute 10
June 2017, AS Paper 2, Q19 (1 mark): Which sample contains the most molecules? The Avogadro constant, L = 6.022 x 1023 mol−1 [1 mark] A 2.10 × 1022 molecules of methane, CH4 B 1.00 g of oxygen, O2
June 2017, AS Paper 2, Q22 (1 mark): A sample of 2.0 mol dm−3 acid has a volume of 100 cm3 What volume of water, in cm3, should be added to this acid to dilute the sample to a concentration of 1.5
June 2017, AS Paper 2, Q23 (1 mark): Two sealed flasks with the same volume are left side by side. Flask A contains 4.0 × 10−3 mol of methane. Flask B contains 340 mg of a different gas. Both gases
June 2017, AS Paper 2, Q24 (1 mark): Analysis of a sample of a chemical with formula C22H30N6O4S, showed that it contained 0.0195 mol of carbon. What mass of nitrogen was present in the sample? [1
June 2016, AS Paper 1, Q03.1 (3 marks): Calculate the mean titre and use this to determine the amount, in moles, of HCl that reacted with 25.0 cm3 of the MHCO3 solution. [3 marks
June 2016, AS Paper 1, Q03.2 (3 marks): Calculate the amount, in moles, of MHCO3 in 250 cm3 of the solution. Then calculate the experimental value for the Mr of MHCO3. Give your answer to the appropri
June 2016, AS Paper 1, Q03.3 (2 marks): The student identified use of the burette as the largest source of uncertainty in the experiment. Using the same apparatus, suggest how the procedure could be i
June 2016, AS Paper 1, Q03.4 (6 marks): Another student is required to make up 250 cm3 of an aqueous solution that contains a known mass of MHCO3. The student is provided with a sample bottle containi
June 2016, AS Paper 1, Q05.1 (3 marks): Calculate the mass of ammonia in flask Q. Give your answer to the appropriate number of significant figures. [3 marks
June 2016, AS Paper 1, Q05.2 (3 marks): When the tap is opened, ammonia passes into flask P. The temperature decreases by 5 °C. The final pressure in both flasks is 75.0 kPa. Calculate the volume, in
June 2016, AS Paper 1, Q09.1 (4 marks): A student was given a powder made from a mixture of anhydrous barium chloride and anhydrous magnesium chloride. The student dissolved 1.056 g of the powder in w
June 2016, AS Paper 1, Q12 (1 mark): There are 392 mol of pure gold in a bar measuring 10 cm by 10 cm by 40 cm. What is the density of gold in kg dm−3? [1 mark] A 193 B 19.3 C 1.93 D 0.193
June 2016, AS Paper 1, Q21 (1 mark): In a molecule of a hydrocarbon, the fraction by mass of carbon is 9 11 What is the empirical formula of the hydrocarbon? [1 mark A CH B CH3 C C3H8 D C5H12
June 2016, AS Paper 1, Q22: 30 cm3 of xenon are mixed with 20 cm3 of fluorine. The gases react according to the following equation. Assume that the temperature and pressure remain constan
June 2016, AS Paper 1, Q23: Which of the following solutions would react exactly with a solution containing 0.0500 mol sulfuric acid? [1 mar A 50.0 cm3 of 1.00 mol dm−3 KOH B 100.0 cm3 of
June 2016, AS Paper 1, Q24 (1 mark): In a car airbag, sodium azide (NaN3) decomposes to form sodium metal and nitrogen gas. 2NaN3(s) → 2Na(s) + 3N2(g) The sodium metal then reacts with potassium ni
June 2016, AS Paper 2, Q05.5 (2 marks): A refrigerator contains 1.41 kg of 1,1,1-trifluoroethane (CF3CH3). Calculate the number of molecules of 1,1,1-trifluoroethane in the refrigerator. Give your ans
June 2016, AS Paper 2, Q08.1 (3 marks): The equation for the reaction between ethanoic acid and magnesium is shown. 2CH3COOH(aq) + Mg(s) → (CH3COO)2Mg(aq) + H2(g) With the aid of calculations, show th
June 2016, AS Paper 2, Q11 (1 mark): Propene can be made by the dehydration of propan-2-ol. What is the percentage yield when 30 g of propene (Mr = 42.0) are formed from 50 g of propan-2-ol (Mr = 6
June 2016, AS Paper 2, Q14 (1 mark): An organic compound is found to contain 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. Which of the following compounds could this be? [1 mark] A Ethanol B Ethan
June 2016, AS Paper 2, Q20 (1 mark): The Mr of hydrated copper sulfate (CuSO4.5H2O) is 249.6. Which of the following is the mass of hydrated copper sulfate required to make 50.0 cm3 of a 0.400 mol
June 2016, AS Paper 2, Q23 (1 mark): 2 mol of ideal gas X are stored in a flask of fixed volume. Which of the following changes would lead to the greatest increase in pressure inside the flask? [1
Specimen, Paper 2, Q03.8 (3 marks): Isooctane reacts with an excess of chlorine to form a mixture of chlorinated compounds. One of these compounds contains 24.6% carbon and 2.56% hydrogen by mass.
Specimen, Paper 2, Q09.4 (3 marks): In an experiment starting with 5.05 g of phenylamine, 4.82 g of purified product were obtained in step 1. Calculate the percentage yield in this reaction. Give
Specimen, Paper 3, Q02.2 (1 mark): Complete Table 2. [1 mark 0 2 . 2
Specimen, Paper 3, Q02.3 (2 marks): Mean titre = c Calculation Justification
Specimen, Paper 3, Q02.5 (1 mark): Percentage uncertainty = %
Specimen, Paper 3, Q02.6 (2 marks): 8
Specimen, Paper 3, Q08 (1 mark): An ester is hydrolysed as shown by the following equation. RCOOR/ + H2O RCOOH + R/OH What is the percentage yield of RCOOH when 0.50 g of RCOOH (Mr = 100) is ob
Specimen, Paper 3, Q19 (1 mark): In an experiment to identify a Group 2 metal (X), 0.102 g of X reacts with an excess of aqueous hydrochloric acid according to the following equation. X + 2HCl

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