AS & A Level Chemistry (9701) — May–June 2025, Paper 13
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Which isolated gaseous atom has a total of five electrons occupying spherically shaped orbitals? A sodium B fluorine C boron D potassium
Answer this question and get it marked →Diagram 1 shows the reaction pathway for a reaction. Diagram 2 shows a graph of concentration of reactant against time for the same reaction. The reaction is exothermic with…
Answer this question and get it marked →The equation shows the overall reaction between an amine and an acid chloride. 2CH3CH2NH2 + CH3CH2COCl → CH3CH2CONHCH2CH3 + CH3CH2NH3Cl The four steps in the mechanism are shown…
Answer this question and get it marked →Chromium is present in compound X. - Two moles of compound X react with exactly 3 moles of silicon. - The only products of this reaction are 4 moles of chromium and 3 moles of a…
Answer this question and get it marked →The reversible reaction shown is in equilibrium at a temperature of 450 °C. H2 + I2 ⇌ 2HI ΔH = –9.5 kJ mol^-1 The table shows the equilibrium concentrations: H2 = 1.02 mol dm^-3,…
Answer this question and get it marked →The first stage in the industrial production of nitric acid from ammonia can be represented by the following equation. 4NH3(g) + 5O2(g) ⇌ 4NO(g) + 6H2O(g) Using the following…
Answer this question and get it marked →The gaseous compound Z decomposes on heating. In the diagram, Boltzmann distributions for Z at two different temperatures, P and Q, are shown. Lines X and Y indicate activation…
Answer this question and get it marked →The structure of a molecule found in food is shown (a glucose-like monosaccharide ring structure with CH2OH group). Four statements about the molecule are listed. 1 This molecule…
Answer this question and get it marked →In which substance are covalent bonds broken as it melts? A silicon(IV) oxide B ice C iodine D ethanol
Answer this question and get it marked →Why is the second ionisation energy of sodium larger than the second ionisation energy of magnesium? A The attraction between the nucleus and the outer electron is greater in Na^+…
Answer this question and get it marked →BF3 reacts with NH3 to form a single compound with a simple molecular structure. BF3 + NH3 → F3B–NH3 Which row describes how the bond angles change during the reaction? A F–B–F…
Answer this question and get it marked →The equation for the reaction of nitrogen with hydrogen is shown. N2(g) + 3H2(g) ⇌ 2NH3(g) ΔHr° = –92.2 kJ mol^-1 Which statement is correct? A ΔHr° is measured at 298 °C. B ΔHr°…
Answer this question and get it marked →Hydrogen peroxide, H2O2, decomposes into water and oxygen when a suitable catalyst is added. 20.0 cm^3 of aqueous hydrogen peroxide decomposes to produce 600 cm^3 of oxygen at…
Answer this question and get it marked →When 0.15 g of an organic compound is vaporised, it occupies a volume of 65.0 cm^3 at 405 K and 1.00 × 10^5 Pa. Using the expression pV = nRT, which expression should be used to…
Answer this question and get it marked →A washing powder contains sodium hydrogencarbonate, NaHCO3, as one of the ingredients. In a titration, a solution containing 1.00 g of this washing powder requires 7.15 cm^3 of…
Answer this question and get it marked →The flow chart shows some reactions of nitrogen compounds. gas 1 →(acid)→ salt 1 →(alkali)→ salt 2 + other products Which row identifies gas 1 and salt 2? A gas 1 = ammonia, salt…
Answer this question and get it marked →Mixing aqueous silver nitrate and aqueous sodium chloride produces a precipitate. Addition of which reagent to the mixture gives a colourless solution? A aqueous ammonia B aqueous…
Answer this question and get it marked →Which statement is correct? A Barium oxide reacts with water at room temperature to form barium hydroxide and hydrogen. B Calcium oxide does not react with water at room…
Answer this question and get it marked →Which statement about the properties of halogens and hydrogen halides is correct? A A chloride ion is a stronger reducing agent than an iodide ion. B Chlorine is more volatile…
Answer this question and get it marked →Three statements about the chemical periodicity of Period 3 oxides are listed. 1 The maximum oxidation state of the Period 3 elements in their oxides increases from sodium to…
Answer this question and get it marked →Which dot-and-cross diagrams represent molecules that can react with unburned hydrocarbons to form peroxyacetyl nitrate, PAN, a component of photochemical smog? (Diagrams 1–4…
Answer this question and get it marked →Which set of three elements contains a single element that has both the highest melting point and the lowest electrical conductivity of the three elements in the set? A magnesium,…
Answer this question and get it marked →In which row do the particles increase in size? smallest → largest: A N, O, F B N^3-, O^2-, F^- C Na^+, Mg^2+, Al^3+ D Na^+, Ne, F^-
Answer this question and get it marked →W, X, Y and Z are Group 2 elements barium, calcium, magnesium and strontium but not in that order. W reacts faster with dilute hydrochloric acid than Y. The hydroxide of X is less…
Answer this question and get it marked →Polymer J has repeat unit –[CH(C2H5)CH(CH3)]–. Polymer K has repeat unit –[CH(CH3)CH(CH3)]–. Which row is correct? A polymer J from pent-1-ene, polymer K from but-1-ene B polymer…
Answer this question and get it marked →0.200 mol ethanenitrile reacts with an excess of dilute sodium hydroxide. The reaction produces organic compound S and ammonia gas only. The reaction has an 80.0% yield. Which…
Answer this question and get it marked →The structure of butenedioic acid is shown (trans-butenedioic acid / fumaric acid structure with C=C double bond). When an excess of NaOH(aq) is added to butenedioic acid, which…
Answer this question and get it marked →Four organic compounds are shown (a pentyl ester, methyl formate, an unsaturated ester, and an isobutyl ester). A mixture of these four compounds reacts with hot aqueous sodium…
Answer this question and get it marked →Ethanal reacts with KCN dissolved in liquid HCN. This reaction involves the formation of an intermediate. Which statement is correct? A HCN does not have any lone pairs of…
Answer this question and get it marked →What is formed when propanone is heated under reflux with a solution of NaBH4? A propan-2-ol B propan-1-ol C propanal D propane
Answer this question and get it marked →The compounds shown are all produced by plants (four terpenol-type alcohols with different positions of OH and degrees of unsaturation). Each compound is warmed with acidified…
Answer this question and get it marked →Structural and stereoisomerism should be considered when answering this question. How many alcohols with the molecular formula C5H12O give a yellow precipitate with alkaline…
Answer this question and get it marked →An amine is produced in the following reaction. C2H5I + 2NH3 → C2H5NH2 + NH4I What is the mechanism? A electrophilic addition B free-radical substitution C nucleophilic addition D…
Answer this question and get it marked →The reaction shown can be used to lengthen a carbon chain. CH3CH2CH2Br + CN^- → CH3CH2CH2CN + Br^- Which row shows the correct reagent and conditions for this reaction? A KCN,…
Answer this question and get it marked →Which row shows the products formed when cyclohexene reacts with acidified KMnO4 under different conditions? A cold dilute: cyclohexanediol; hot concentrated: hexanedioic acid B…
Answer this question and get it marked →Two steps in the free-radical substitution reaction between methane and chlorine are shown. step 1 CH3• + Cl2 → CH3Cl + Cl• step 2 CH3Cl + Cl• → CH2Cl• + HCl Which statement is…
Answer this question and get it marked →Compound P displays cis/trans isomerism and gives a red-brown precipitate with Fehling's solution. What is P? A H2C=C(CH2CHO)/CH3 — has both C=C for cis/trans and aldehyde? No B H…
Answer this question and get it marked →Fructose is a sugar with more than one chiral centre. The fructose molecule is shown with X, Y and Z indicating three carbon atoms. Which carbon atoms are chiral centres? A X, Y…
Answer this question and get it marked →An organic compound, T, contains only one functional group. Compound T has the empirical formula C2H4O. Some functional groups are listed. 1 alcohol 2 aldehyde 3 ester 4 ketone…
Answer this question and get it marked →The mass spectrum of an organic compound has the following features: - The molecular ion peak is at m/e = 60. This peak has a relative intensity = 100. - There is a peak at m/e =…
Answer this question and get it marked →