AS & A Level Chemistry (9701) — October–November 2023, Paper 11
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Sodium azide, NaN3, is an explosive used to inflate airbags in cars when they crash. It consists of positive sodium ions and negative azide ions. What are the numbers of electrons…
Answer this question and get it marked →The graph shows the variation of the first ionisation energy with proton number for some elements (the letters P, Q, R, S, T, U, V, W, X are not the actual symbols). Which…
Answer this question and get it marked →Aluminium carbide, Al4C3, reacts readily with aqueous sodium hydroxide. The two products of the reaction are NaAlO2 and a hydrocarbon. Water molecules are also involved as…
Answer this question and get it marked →A sample of 35.6 g of hydrated sodium carbonate contains 25.84% sodium ions by mass. When this sample is heated, anhydrous sodium carbonate and water are formed. Which mass of…
Answer this question and get it marked →Solid aluminium chloride sublimes at 178 degrees C. Which structure best represents the species in the vapour at this temperature? A: a dimer Al2Cl6 with two chlorine bridges…
Answer this question and get it marked →Which row is correct? A: shape of H3O+ pyramidal, shape of SCl2 non-linear. B: shape of H3O+ pyramidal, shape of SCl2 linear. C: shape of H3O+ trigonal planar, shape of SCl2…
Answer this question and get it marked →When an evacuated tube of volume 400 cm3 is filled with gas at 300 K and 101 kPa, the mass of the tube increases by 0.65 g. Assume the gas behaves as an ideal gas. What is the…
Answer this question and get it marked →Nitrogen, N2, and carbon monoxide, CO, both have Mr = 28. The boiling point of N2 is 77 K. The boiling point of CO is 82 K. What could be responsible for this difference in…
Answer this question and get it marked →Which statement about enthalpy changes is correct? A: Enthalpy changes of reaction are always negative. B: Enthalpy changes of combustion are always positive. C: Enthalpy changes…
Answer this question and get it marked →What is the definition of standard enthalpy change of neutralisation, delta-H neut? A: delta-H when one mole of an aqueous acid is neutralised by an aqueous alkali. B: delta-H…
Answer this question and get it marked →HOCl(aq) is the molecule that kills bacteria when chlorine is added to water. The reaction Cl2(g) + H2O(l) <= HOCl(aq) + H+(aq) + Cl-(aq) produces this molecule. Which statement…
Answer this question and get it marked →Nitrogen dioxide, NO2, exists in equilibrium with dinitrogen tetroxide, N2O4: 2NO2(g) <= N2O4(g), delta-H = -57 kJ mol-1. Which conditions give the greatest percentage of N2O4(g)…
Answer this question and get it marked →When an equimolar mixture of H2 and I2 react, the mole fraction of HI in the final mixture is x. What is the equilibrium constant, Kp, for the reaction? A: x^2 / (1-x)^2. B: x^2 /…
Answer this question and get it marked →In reaction 1, a student measures the initial rate of production of CO2(g) when CuCO3(s) is added to 50 cm3 of 0.1 mol dm-3 HNO3(aq). In reaction 2, the student repeats the…
Answer this question and get it marked →The forward reaction of a reversible reaction is exothermic and has an activation energy of +30 kJ mol-1. The reverse reaction proceeds by a mechanism that is the exact reverse of…
Answer this question and get it marked →X, Y and Z are elements all found within Groups 13, 14 and 15 of the Periodic Table. X is in the same group as Y. Y and Z are in Period 3. The first ionisation energy of X is…
Answer this question and get it marked →Which row about silicon, Si, and magnesium, Mg, and their ions is correct? A: Si has a greater atomic radius than Mg, because Si has electrons in 3p orbitals and Mg has electrons…
Answer this question and get it marked →Bromocresol green is an acid-base indicator; below pH 3.8 it is yellow, above pH 5.4 it is blue, and between these values it is green. Bromocresol green is added to the aqueous…
Answer this question and get it marked →Which row correctly describes the separate reactions of calcium and strontium with water? A: substance reduced calcium or strontium, substance oxidised water, more vigorous…
Answer this question and get it marked →L and M are both compounds of Group 2 elements. L and M are both soluble in water. When solutions of L and M are mixed, a white precipitate is formed. What could be L and M? A:…
Answer this question and get it marked →A 5.00 g sample of an anhydrous Group 2 metal nitrate loses 3.29 g in mass when heated strongly. Which metal is present? A: magnesium. B: calcium. C: strontium. D: barium.
Answer this question and get it marked →In this question, Q represents an atom of chlorine, bromine or iodine. Which explanation for the variation in volatility down Group 17 is correct? A: Instantaneous dipole-induced…
Answer this question and get it marked →Which statement about the halogens or halide ions is correct? A: Bromide ions react to form a white precipitate when added to silver nitrate solution. B: Bromine does not oxidise…
Answer this question and get it marked →If ammonium cyanate is heated in the absence of air, the only product of the reaction is urea, CO(NH2)2; no other products are formed. What is the formula of the cyanate ion…
Answer this question and get it marked →Hexamine is a crystalline solid used as a fuel in portable stoves; the diagram shows its skeletal structure (a cage molecule containing six CH2 groups and four nitrogen atoms).…
Answer this question and get it marked →The compound aspartame is widely used as a sweetener in diet soft drinks. The skeletal structure of aspartame is shown. Aspartame is chiral (there are no chiral carbon atoms in…
Answer this question and get it marked →How many sigma and pi bonds are in the molecule HCCCH2CH2CHC(CH3)2? A: 17 sigma 3 pi. B: 17 sigma 5 pi. C: 18 sigma 4 pi. D: 19 sigma 3 pi.
Answer this question and get it marked →The hydrocarbon C17H36 can be cracked. Which compound is the least likely to be produced in this reaction? A: C3H8. B: C4H8. C: C8H16. D: C16H34.
Answer this question and get it marked →Which compound has an Mr of 84 and will react with HBr to give a product with an Mr of 164.9? A: cyclohexane. B: a hexene (CH3CH2CH=CHCH2CH3, hex-3-ene). C: pentan-3-one. D: a…
Answer this question and get it marked →Beta-carotene is responsible for the orange colour of carrots; its skeletal structure is shown. Beta-carotene is oxidised by hot, concentrated, acidified KMnO4. When an individual…
Answer this question and get it marked →1,1-dichloropropane reacts with aqueous sodium hydroxide in a series of steps to give propanal: CH3CH2CHCl2 reacts with NaOH(aq) to give CH3CH2CHO. Which term describes the first…
Answer this question and get it marked →Propanoic acid can be made from bromoethane using a two-stage synthesis. Which pair of reagents is most suitable? A: stage 1 hydrogen cyanide, stage 2 aqueous sodium hydroxide. B:…
Answer this question and get it marked →Alcohol X gives a yellow precipitate with alkaline I2(aq). What is the structure of X? A: a dimethyl-substituted cyclohexanol with the OH on a CH carbon (a secondary alcohol…
Answer this question and get it marked →When ethanol reacts with sodium metal, ethoxide ions, CH3CH2O-, are produced. When water reacts with sodium metal, OH- ions are produced. Which statement about these reactions and…
Answer this question and get it marked →Menthol is a naturally occurring alcohol (a cyclohexane ring bearing a methyl group, an isopropyl group and an OH group). When menthol is heated with concentrated sulfuric acid it…
Answer this question and get it marked →Which compound will produce a yellow-orange precipitate when added to 2,4-dinitrophenylhydrazine? A: cyclohexene. B: a cyclic ester (lactone). C: cyclohexanecarboxylic acid. D:…
Answer this question and get it marked →Ethanal, CH3CHO, undergoes an addition reaction with HCN in the presence of CN- ions. Which row identifies the type of reaction and the name of the product formed? A:…
Answer this question and get it marked →The structure of compound X is shown - a five-membered cyclic ester (a gamma-lactone) bearing a methyl substituent on the carbon next to the ring oxygen. What is produced when X…
Answer this question and get it marked →The infrared spectrum of compound L is shown, together with a table of characteristic IR absorption ranges. The spectrum shows a broad strong absorption around 3200-3600 cm-1 and…
Answer this question and get it marked →In the mass spectrum of compound J, the ratio of the height of the M+1 ion peak to the height of the M+ ion peak is 4:91. Compound J forms a carboxylic acid when heated with…
Answer this question and get it marked →