AS & A Level Chemistry (9701) — May–June 2025, Paper 12
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Consider the following statements. 1 Silicon dioxide has a higher melting point than sulfur dioxide. 2 Ammonia has a higher boiling point than phosphine, PH3. Which statements are…
Answer this question and get it marked →How many neutrons are contained in an atom of iron with a mass number of 60? A 26 B 30 C 34 D 60
Answer this question and get it marked →The diagram shows a Boltzmann distribution of molecular energies for a gaseous reaction at two different temperatures and two different activation energies (T1, T2, EA(1), EA(2)).…
Answer this question and get it marked →The reaction between sulfur dioxide and oxygen has the equation shown. 2SO2(g) + O2(g) ⇌ 2SO3(g) ΔH = –197 kJ mol^-1 1.0 mol of SO2 and 1.0 mol of O2 are placed in a closed…
Answer this question and get it marked →'Red lead' is a red pigment with the formula Pb3O4. Every formula unit of 'red lead' is the same. Each formula unit contains three lead ions and four oxide ions. Lead has two…
Answer this question and get it marked →Some standard enthalpy of combustion data are given. substance standard enthalpy change of combustion/kJ mol^-1 C(s) –394 H2(g) –286 CH3OH(l) –726 Using these data, what is the…
Answer this question and get it marked →Which row is correct? smallest bond angle → largest bond angle: A H2O, NH3, BF3 B BF3, NH3, H2O C NH3, H2O, BF3 D H2O, BF3, NH3
Answer this question and get it marked →In the Haber process, the reaction between the two gaseous reactants requires the use of a catalyst that contains a transition element. What is the metal and in which mole ratio…
Answer this question and get it marked →Aqueous hydrogen peroxide, H2O2, decomposes into water and oxygen in the presence of a suitable catalyst. 50 cm^3 of a 0.50 mol dm^-3 solution of hydrogen peroxide produced 120…
Answer this question and get it marked →The average intermolecular forces in water are much stronger than the average intermolecular forces in steam. The average intermolecular forces in ice are slightly stronger than…
Answer this question and get it marked →An experiment is carried out to determine the value of x in hydrated lithium hydroxide, LiOH·xH2O. A sample of the solid is heated in a crucible over a Bunsen flame. Complete…
Answer this question and get it marked →A sample of an ideal gas occupies 240 cm^3 at 37 °C and 100 kPa. How many moles of gas are present in the sample? A 9.32 × 10^-6 B 9.32 × 10^-3 C 0.0781 D 78.1
Answer this question and get it marked →Under certain conditions, CCl4 and H2O react as shown. The activation energy for the reaction is +62 kJ mol^-1. CCl4 + 2H2O → CO2 + 4HCl ΔH = –61.5 kJ mol^-1 Which enthalpy…
Answer this question and get it marked →A helium ion contains two protons, two neutrons and one electron. This helium ion and a proton are passed separately through a uniform electric field. The particles are travelling…
Answer this question and get it marked →The skeletal formulae of arginine and lysine are shown. Which row is correct? A arginine, empirical formula C3H7N2O, Mr 174 B arginine, empirical formula C3H8N2O, Mr 176 C lysine,…
Answer this question and get it marked →The oxide and chloride of an element X are separately mixed with water. The two resulting solutions have the same effect on litmus. What could element X be? A Al B Ca C Na D P
Answer this question and get it marked →Why do the halogens become less volatile as Group 17 is descended? A The halogen–halogen bond energy decreases. B The halogen–halogen bond energy increases. C The number of…
Answer this question and get it marked →Compound M is a white solid. It is the chloride of a Period 3 element. reaction observation compound M + non-polar solvent colourless solution compound M added a little at a time…
Answer this question and get it marked →Which statement about strontium and its compounds is correct? A Strontium hydroxide is more soluble than barium hydroxide. B Strontium sulfate is more soluble than magnesium…
Answer this question and get it marked →Sodium bromide is warmed with concentrated sulfuric acid. Which row describes the change in the oxidation number of the sulfur and the role of the bromide ions in the reaction? A…
Answer this question and get it marked →A reaction occurs when ammonium chloride is added to calcium hydroxide. What is the role of the ammonium ions in this reaction? A acid B base C oxidising agent D reducing agent
Answer this question and get it marked →Elements Y and Z are both in Period 3. Element Y has the smallest atomic radius in Period 3. There are only two elements in Period 3 that have a lower melting point than element…
Answer this question and get it marked →1.0 g of each of four different compounds of Group 2 elements are thermally decomposed. The residue in each decomposition is the oxide of the Group 2 element. The volume of gas…
Answer this question and get it marked →Sulfur dioxide in the atmosphere can form acid rain. This occurs in two steps: 1 oxidation of SO2 to SO3 2 formation of dilute H2SO4 Which row identifies the atmospheric catalyst…
Answer this question and get it marked →Which statement about the mechanism of an SN1 reaction of a halogenoalkane is correct? A A nucleophile is substituted by an electrophile. B One intermediate is formed from two…
Answer this question and get it marked →The repeat unit of a polymer is shown: [-CH2-CHCl-CH2-CHOH-]n Three statements about this polymer are listed. 1 Its disposal is hazardous because it produces toxic gases when…
Answer this question and get it marked →Methanoic acid, HCO2H, has acidic properties similar to those of other carboxylic acids. In addition, it can be oxidised by the same oxidising agents that are capable of oxidising…
Answer this question and get it marked →Which row gives pentanenitrile as one product? A 1-bromobutane + heat with HCN B 1-bromobutane + heat with KCN using ethanol as solvent C 1-bromopentane + heat with HCN D…
Answer this question and get it marked →An ester, R'CO2R'', is hydrolysed in alkaline conditions. R' and R'' are different alkyl groups. Which row identifies the two products formed? A product 1: R'CO2H, product 2:…
Answer this question and get it marked →Which compound cannot be oxidised by acidified potassium dichromate(VI) solution but does react with sodium metal? A (CH3)3COH B CH3COCH2CH3 C CH3CH2CH2CH2OH D CH3CH2CH(OH)CH3
Answer this question and get it marked →Butan-2-one reacts with alkaline I2(aq). An excess of dilute sulfuric acid is then added to the reaction mixture. The organic products of this reaction sequence are triiodomethane…
Answer this question and get it marked →Four reagents are listed. 1 aqueous KCl 2 dilute HCl 3 liquid SOCl2 4 solid PCl5 Which reagents, when added to ethanol, will rapidly produce a gas that turns blue litmus red? A 1…
Answer this question and get it marked →Four drops of 1-chlorobutane, 1-bromobutane and 1-iodobutane are put separately into three test-tubes containing 1.0 cm^3 of aqueous silver nitrate at 60 °C. In each case, a…
Answer this question and get it marked →Propanoic acid reacts with LiAlH4 to give organic product P. Methanoic acid reacts with organic product P, in the presence of a few drops of concentrated sulfuric acid, to give…
Answer this question and get it marked →Samples of the gases CH3Cl and Cl2 are mixed together and irradiated with ultraviolet light. Which compound is produced by a termination step in the reaction? A HCl B CH2=CH2 C…
Answer this question and get it marked →Propan-1-ol, C3H7OH, is dehydrated by passing its vapour over hot aluminium oxide to give a hydrocarbon. Which structural formula represents the product obtained when the…
Answer this question and get it marked →Alkane S has molecular formula C4H10. S reacts with Cl2(g) in the presence of sunlight to produce only two different monochloroalkanes, C4H9Cl. Both of these monochloroalkanes are…
Answer this question and get it marked →Including structural isomers and stereoisomers, how many isomers are there of C2H2Br2? A 2 B 3 C 4 D 5
Answer this question and get it marked →Which compound exhibits stereoisomerism? A 1,1-dichloropropene B 2,3-dichloropropene C 1,2-dichloropropane D 1,3-dichloropropane
Answer this question and get it marked →The mass spectrum of CH3Cl shows a molecular ion peak, M^+, at the m/e value of 50 with a relative abundance of 18.0%. Other peaks are present in the mass spectrum. What is seen…
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