AS & A Level Chemistry (9701) — May–June 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 →When chlorine gas is analysed in a mass spectrometer, 35Cl+ ions are detected. Which row is correct? number of neutrons in 35Cl+ electronic configuration of 35Cl+ --- --- --- A 17…
Answer this question and get it marked →Which species is a free radical? A He B Be- C O2- D Zn
Answer this question and get it marked →Which statement is correct? A The first ionisation energy of chlorine is more than the first ionisation energy of argon. B The second ionisation energy of calcium is more than the…
Answer this question and get it marked →If 1 mol of hexane combusts in an excess of oxygen, how many moles of products are formed? A 11 B 12 C 13 D 14
Answer this question and get it marked →Separate samples, each of mass 1.0 g, of the compounds listed are treated with an excess of dilute acid. Which compound releases the largest amount of CO2? A 1.0 g CaCO3 B 1.0 g…
Answer this question and get it marked →Which statement about the ClN=O molecule is correct? A Each molecule contains one sigma and one pi bond. B It is a non-polar molecule. C It is a linear molecule. D The nitrogen…
Answer this question and get it marked →Which row is correct? molecule shape total number of pairs of electrons in the valence shell of the central atom --- --- --- --- A CO2 linear two B BF3 trigonal planar three C NH3…
Answer this question and get it marked →The volume of a vessel is 1.20 x 10^-3 m3. It contains pure argon at a pressure of 1.00 x 10^5 Pa, and at a temperature of 25.0 degC. Under these conditions it can be assumed that…
Answer this question and get it marked →A student mixed 25.0 cm3 of 4.00 mol dm^-3 hydrochloric acid with an equal volume of 4.00 mol dm^-3 sodium hydroxide. The initial temperature of both solutions was 15.0 degC. The…
Answer this question and get it marked →Nitrogen monoxide is rapidly oxidised to nitrogen dioxide. 2NO(g) + O2(g) - 2NO2(g) Nitrogen dioxide can then dimerise to form dinitrogen tetroxide. 2NO2(g) - N2O4(g) delta H =…
Answer this question and get it marked →LiAlH4 contains AlH4- ions in which aluminium has an oxidation state of +3. LiAlH4 reacts with water, as shown. LiAlH4 + 4H2O - 4H2 + LiOH + Al(OH)3 In this reaction, each of the…
Answer this question and get it marked →The vanadium salt, VOSO4, is soluble in water and reacts readily with powdered manganese in dilute sulfuric acid. The equation for the reaction is correct? Mn(s) + 2VOSO4(aq) +…
Answer this question and get it marked →In which equilibrium will an increase in pressure at constant temperature increase the yield of the products on the right-hand side of the equation? A CaCO3(s) <= CaO(s) + CO2(g)…
Answer this question and get it marked →Hydrogen iodide is added to an evacuated reaction vessel. The vessel is sealed and warmed. A decomposition reaction occurs. Hydrogen and iodine are formed. Some hydrogen iodide…
Answer this question and get it marked →The equations for two reactions are shown. reaction X: 2NOBr - 2NO + Br2 reaction Y: 2NOCl - 2NO + Cl2 The two reactions have similar reaction mechanisms. The initial rate of…
Answer this question and get it marked →The diagram shows the Boltzmann distribution of energies in a gas. The gas can take part in a reaction with an activation energy, Ea. The gas is maintained at a constant…
Answer this question and get it marked →L, M and N are three different elements from Period 3 of the Periodic Table. L is the element whose atoms have three unpaired electrons in its 3p sub-shell. M is the element with…
Answer this question and get it marked →In reactions 1 and 2, X represents an element in Period 3. In each reaction, X is forming a chloride or oxide in which X is in its highest oxidation state. reaction 1: chlorine +…
Answer this question and get it marked →Sodium, magnesium, aluminium, silicon and phosphorus are all elements in Period 3 of the Periodic Table. Three statements about the oxides and chlorides of these elements are…
Answer this question and get it marked →The table compares calcium with barium and calcium carbonate with barium carbonate. Which row is correct? reactivity of the element with water thermal stability of the metal…
Answer this question and get it marked →Solutions P and Q each contain a different Group 2 ion at the same concentration. One contains Mg2+ and the other contains Ba2+. Tests are carried out on separate 5 cm3 samples of…
Answer this question and get it marked →J dissolves in water to give an aqueous solution K. K gives a dense white precipitate when aqueous silver nitrate is added. When heated with aqueous potassium hydroxide, K gives…
Answer this question and get it marked →Ammonium sulfate, (NH4)2SO4, and ammonium nitrate, NH4NO3, are used as fertilisers. These salts have different percentages by mass of nitrogen. They have the same effect as each…
Answer this question and get it marked →The equation shows a reaction that occurs between carbon monoxide and nitrogen monoxide in a catalytic converter. 2CO(g) + 2NO(g) - 2CO2(g) + N2(g) Which statement is correct? A…
Answer this question and get it marked →Which compound has the molecular formula C6H10O? Four skeletal structures are shown: A is a cyclopentane ring with a C=O group (cyclopentanone), B is 3,3-dimethylbutan-2-one type…
Answer this question and get it marked →The general formula for a non-cyclic alcohol is CnH2n+1OH. How many different structural isomers are there for n = 3 and n = 4? n = 3 n = 4 --- --- --- A 2 2 B 2 4 C 3 4 D 3 8
Answer this question and get it marked →Compound X, C5H10O3, has one chiral carbon atom per molecule. Compound X produces bubbles with Na but not with Na2CO3. Which formula could represent compound X? A…
Answer this question and get it marked →Ethane reacts with an excess of chlorine in the presence of ultraviolet light to form a mixture of products. How many of these products contain two carbon atoms and one or more…
Answer this question and get it marked →When bromoethane reacts with hot ethanolic sodium hydroxide a colourless gas is formed. This gas decolourises aqueous bromine. What is the colourless gas? A 1,2-dibromoethane B…
Answer this question and get it marked →Alkynes are hydrocarbons that contain one triple C-C bond. Like alkenes, alkynes take part in addition reactions. A saturated compound can be formed. For example, ethyne, H-C-C-H,…
Answer this question and get it marked →Bromine reacts with alkenes by an electrophilic addition mechanism in which a cation is formed as an intermediate. Which mixture will produce the most stable intermediate cation?…
Answer this question and get it marked →Halogenoalkanes react with hot ethanolic potassium cyanide. The reaction mechanism is either SN1 or SN2. Which statement is correct? A All secondary halogenoalkanes react by the…
Answer this question and get it marked →X, Y and Z are three isomeric alcohols. X CH3CH2CH2CH2CH2OH Y CH3CH2CH(OH)CH2CH3 Z (CH3)3C(OH)CH2CH3 Separate samples of each alcohol are warmed with a mild oxidising agent and…
Answer this question and get it marked →Compound G gives a pale yellow precipitate with alkaline I2(aq). What could be compound G? A pentan-1-ol B pentan-2-ol C pentan-3-ol D 2-methylpentan-2-ol
Answer this question and get it marked →The mechanism for the reaction between ethanal and hydrogen cyanide starts with the step shown: a cyanide ion (CN-) attacks the carbonyl carbon of ethanal (CH3CHO) and the pi…
Answer this question and get it marked →Which compound reacts with 2,4-dinitrophenylhydrazine reagent but does not react with Tollens' reagent? A CH3COCO2H B CH3CH(OH)CHO C CH3COCHO D CH3CH(OH)CH3
Answer this question and get it marked →Compound X has stereoisomers and forms a precipitate when warmed with Fehling's reagent. What could be the structure of compound X? Four skeletal structures are shown. A:…
Answer this question and get it marked →Which reaction will form propanoic acid? A acidic hydrolysis of propyl ethanoate B alkaline hydrolysis of ethyl propanoate C acidic hydrolysis of propanenitrile D acidic…
Answer this question and get it marked →Lactide is an intermediate in the manufacture of a synthetic fibre. Lactide is a six-membered ring containing two ester linkages (a cyclic di-ester) with two methyl substituents.…
Answer this question and get it marked →The diagram shows the relative abundance of different isotopes of lead in a sample of lead ore. The abundance of 208 is half that of 206. The abundances of 208 and 209 are equal.…
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