AS & A Level Chemistry (9701) — February–March 2023, Paper 12
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Four equations representing reactions of nitrogen or one of its compounds are given. Which equation represents a disproportionation reaction? A 2HNO3 + CaCO3 → Ca(NO3)2 + CO2 +…
Answer this question and get it marked →The diagram shows the Boltzmann distribution for one mole of a gas. The gas takes part in a reaction with an activation energy, Ea. The graph plots 'number of particles with…
Answer this question and get it marked →A student carries out four experiments to investigate the rate of reaction between 3.0 g of calcium carbonate and hydrochloric acid. CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) +…
Answer this question and get it marked →The table shows the partial pressures in an equilibrium mixture formed by the Haber process. 3H2(g) + N2(g) ⇌ 2NH3(g) substance partial pressure / kPa --- --- nitrogen 7000…
Answer this question and get it marked →A reversible reaction is shown. 2NOCl(g) ⇌ 2NO(g) + Cl2(g) ΔH = +77.0 kJ mol⁻¹ Which change in conditions will move the position of equilibrium to the right and increase the value…
Answer this question and get it marked →The ore psilomelane may be considered to have the general formula Ba(Mn^(x+))(Mn^(y+))8O16(OH)4. In this general formula, x+ and y+ are the two different oxidation states of…
Answer this question and get it marked →Silicon reacts with a mixture of calcium oxide and magnesium oxide at 1200 °C. 2MgO + 2CaO + Si → 2Mg + Ca2SiO4 Which statement about this reaction is correct? A Calcium is…
Answer this question and get it marked →In which species is there a lone pair of electrons? A CH3 B CH3⁺ C CH3⁻ D CH4
Answer this question and get it marked →Under which conditions will nitrogen behave most like an ideal gas? temperature pressure --- --- --- A low high B high low C low low D high high
Answer this question and get it marked →The equation for a chemical reaction is shown. All substances are in their standard states. XeF6 + 3H2O → XeO3 + 6HF Which statement describes the standard enthalpy change of…
Answer this question and get it marked →Molten aluminium chloride has a simple molecular structure. Each molecule consists of two aluminium atoms and six chlorine atoms. Which statement is correct? A All the chlorine…
Answer this question and get it marked →Which atom contains four times as many neutrons as the ⁷₃Li atom? A ⁴⁰₂₀Ca B ²⁴₁₂Mg C ³¹₁₅P D ²⁶₁₄Si
Answer this question and get it marked →Which statement about the first ionisation energies of magnesium and neon is correct? A Magnesium has the greater numerical value and both are endothermic. B Magnesium has the…
Answer this question and get it marked →In a sample of pure water, what is the maximum number of hydrogen bonds that one molecule of water can be involved in? A 1 B 2 C 3 D 4
Answer this question and get it marked →Hydrated cobalt(II) sulfate loses water when heated to give anhydrous cobalt(II) sulfate. All the water of crystallisation is lost to the atmosphere as steam. When 3.10 g of…
Answer this question and get it marked →The table shows bond energies for some diatomic molecules. Deuterium, D, is an isotope of hydrogen. bond energy / kJ mol⁻¹ --- --- F–F 158 Cl–Cl 242 Br–Br 193 I–I 151 H–H 436 D–D…
Answer this question and get it marked →Two procedures are described. 1 Sulfur is burned in an excess of oxygen and then NO is added to the product mixture. 2 Sulfur is burned in an excess of oxygen and then NO2 is…
Answer this question and get it marked →Powder P is a mixture containing two of AgCl, AgBr or AgI. P is shaken with dilute aqueous ammonia. A yellow solid, Q, remains. The mixture is filtered and Q is washed and dried.…
Answer this question and get it marked →Two Period 3 elements, X and Y, burn separately in oxygen to form solid oxides. The oxide of X is insoluble in water. The oxide of Y dissolves in water to form a solution which…
Answer this question and get it marked →Which row describes the structure and bonding of SiO2 and SiCl4? SiO2 structure SiO2 bonding SiCl4 structure SiCl4 bonding --- --- --- --- --- A giant covalent giant covalent B…
Answer this question and get it marked →A sample containing 0.010 mol of anhydrous calcium nitrate is heated strongly until it fully decomposes. All the gas produced is collected and its volume measured at room…
Answer this question and get it marked →V and Z are both elements in Period 3 of the Periodic Table. Each element forms one stable ion that does not contain another element. The atomic radius of each element and the…
Answer this question and get it marked →In Group 2 of the Periodic Table, the properties of the elements and their compounds show regular change down the group. Which property shows a decrease from magnesium to barium?…
Answer this question and get it marked →Four properties of beryllium, Be, or a beryllium compound are listed. Which property is different from the property of magnesium or the equivalent magnesium compound? A Be reacts…
Answer this question and get it marked →Which two formulae correctly represent a pair of structural isomers? A CH3CH(CH3)COOH and (CH3)2CHCOOH B CH3CH(COOH)CH3 and (CH3)2CHCOOH C CH3CHCOOH and CH3CH2CH2COOH D…
Answer this question and get it marked →Which reagents and conditions would result in the formation of butanenitrile, CH3CH2CH2CN? A 1-bromobutane heated under pressure with ammonia in ethanol B 1-bromopropane heated…
Answer this question and get it marked →Compound X, C7H13Br, reacts with hot alcoholic NaOH to produce two compounds, Y and Z. On reaction with Br2, Y gives a product, C7H12Br2, which exists as a mixture of four optical…
Answer this question and get it marked →When illudin S is heated under reflux with an excess of acidified potassium dichromate(VI), compound M is formed. The structure of illudin S is shown: a bicyclic compound…
Answer this question and get it marked →Cyclohexene, C6H10, is a hydrocarbon with a six-membered ring of carbon atoms. It has several structural isomers that are straight-chain alkenes. The number of double bonds in…
Answer this question and get it marked →Exhaust gases from an internal combustion engine are made less harmful by passing them through a catalytic converter. A number of reactions take place in the catalytic converter.…
Answer this question and get it marked →Which compound reacts most rapidly with aqueous silver nitrate by an SN1 mechanism? A 1-chloromethylpropane B 2-chloromethylpropane C 1-iodomethylpropane D 2-iodomethylpropane
Answer this question and get it marked →Tartaric acid, HOOCCH(OH)CH(OH)COOH, is found in many plants. A sample of tartaric acid reacts with an excess of LiAlH4 to form the organic product J. What happens when NaOH(aq)…
Answer this question and get it marked →Citric acid can be converted into tricarballylic acid in two stages. An intermediate, Q, is formed. citric acid →(stage 1)→ Q →(stage 2)→ tricarballylic acid Citric acid is…
Answer this question and get it marked →Structural and stereoisomerism should be considered when answering this question. P has molecular formula C5H10O. P produces an orange precipitate with 2,4-dinitrophenylhydrazine…
Answer this question and get it marked →Two isomeric alcohols, W and X, have molecular formula C4H9OH. W is oxidised to carbonyl compound Y which gives a red precipitate with Fehling's solution. X is oxidised to…
Answer this question and get it marked →The ester ethyl butanoate can be hydrolysed using an excess of dilute sodium hydroxide solution. Which substance is a product of this reaction? A CH3CH2CH2CO2Na B CH3CO2Na C…
Answer this question and get it marked →An aqueous solution contains 4.00 g of a carboxylic acid, Q. When this solution reacts with an excess of magnesium, 380 cm³ of gas is produced, measured at s.t.p. What is the…
Answer this question and get it marked →The infrared spectrum of an organic compound is shown. The spectrum plots transmittance / % against wavenumber / cm⁻¹. It shows a moderate broad absorption around 2900–3000 cm⁻¹…
Answer this question and get it marked →Cyclohexa-1,4-diene is treated with a solution of bromine in tetrachloromethane in the dark. Cyclohexa-1,4-diene is a six-membered carbon ring with two C=C double bonds, one…
Answer this question and get it marked →2-methylbut-2-ene is reacted with hot, concentrated, acidified potassium manganate(VII) solution. What are the products of this reaction? A ethanal and propanone B ethanoic acid…
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