AS & A Level Chemistry (9701) — May–June 2025, Paper 14
40 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →The diagram shows the logarithm of the first 13 ionisation energies of an element. The graph shows a large jump between electrons 2 and 3. Which statement is correct? A A proton…
Answer this question and get it marked →What is the empirical formula of butanoic acid? A C2H4O B C3H6O C C4H8O D C5H10O
Answer this question and get it marked →In which pair is the bond angle in the first species smaller than the smallest bond angle in the second species? A CH4 and SF6 B CO2 and BF3 C H2O and H3O^+ D NH4^+ and NH3
Answer this question and get it marked →Two glass vessels, M and N, are connected by a closed valve. M contains helium at 20 °C at a pressure of 1 × 10^5 Pa. N has been evacuated, and has three times the volume of M.…
Answer this question and get it marked →Solid sulfur consists of molecules made up of eight atoms covalently bonded together. The bonding in sulfur dioxide is O=S=O. enthalpy change of combustion of S8, ΔHc°S8(s) =…
Answer this question and get it marked →In this question, the average oxidation state of sulfur in S2O3^2- and sulfur in S2O4^2- should be used. In which reaction does the underlined element have the largest increase in…
Answer this question and get it marked →Methanol, CH3OH, is made industrially from carbon monoxide and hydrogen in the equilibrium reaction shown. CO(g) + 2H2(g) ⇌ CH3OH(g) ΔH = –100 kJ mol^-1 Which statement about this…
Answer this question and get it marked →The distribution of molecular energies in an ideal gas can be represented in a Boltzmann distribution. Which change in conditions leads to a larger value for the number of…
Answer this question and get it marked →Which graph represents the number of unpaired electrons in the atoms of six elements in Period 3 of the Periodic Table (proton numbers 13–18)? A Monotonically increasing B…
Answer this question and get it marked →A 69.0 g sample of nitrogen dioxide is placed in a reaction vessel. The initial pressure of the nitrogen dioxide is P. An effective catalyst is then added and the nitrogen dioxide…
Answer this question and get it marked →Which statement about the molecule PF5 is correct? A Every F–P–F bond angle is 90°. B The central atom in the molecule does not have a lone pair of electrons. C The molecule has…
Answer this question and get it marked →Which solid compound has both ionic and covalent bonding but not coordinate bonding? A Al2Cl6 B CH3COONa C MgCl2 D NH4Cl
Answer this question and get it marked →Which equation represents the standard enthalpy change of formation, ΔHf°, for ethanol? A 2C(s) + 2½H2(g) + ½O2(g) → C2H5OH(g) B 2C(s) + 2½H2(g) + ½O2(g) → C2H5OH(l) C 2C(s) +…
Answer this question and get it marked →When K2MnO4 reacts with concentrated hydrochloric acid, the products include chlorine molecules and MnCl2. All of the manganese atoms are reduced to MnCl2. Both Mn and Cl change…
Answer this question and get it marked →A nitrogen–hydrogen mixture, initially in the mole ratio of 1:3, reaches equilibrium with ammonia when 50% of the nitrogen has reacted. The total final pressure is p. N2 + 3H2 ⇌…
Answer this question and get it marked →Propyl methanoate is hydrolysed with NaOH(aq) at 20 °C to form two products, X and Y. Product X is an alcohol. Data from the experiment is shown (table of time/s vs [X]/mol…
Answer this question and get it marked →The table shows the numbers of bond pairs and lone pairs in four different species. Which row is correct? A nitrogen molecule: 3 bond pairs, 1 lone pair B ammonia molecule: 4 bond…
Answer this question and get it marked →Which row is correct? A AgI dissolves in aqueous ammonia more readily than AgCl does — AgI reacts with aqueous ammonia B HCl decomposes more readily than HI does — Cl is more…
Answer this question and get it marked →Substance J reacts with water. A gas is given off and the pH of the solution increases. The solution is then reacted with sulfuric acid and a white precipitate forms. What could…
Answer this question and get it marked →Compound L has empirical formula NH. It decomposes on gentle heating to produce ammonia and compound M only. An aqueous solution of compound L is a good conductor of electricity.…
Answer this question and get it marked →X, Y and Z are elements in Period 3 of the Periodic Table. The results of some experiments carried out with compounds of these elements are shown. Element X: oxide + H2O → no…
Answer this question and get it marked →The flow diagram shows two successive reactions starting from element Q. Element Q is either calcium or barium. Element Q forms a nitrate that is less thermally stable than…
Answer this question and get it marked →Which anions are formed when chlorine is passed into cold aqueous potassium hydroxide? A Cl^- and ClO^- B Cl^- and ClO3^- C Cl^- and ClO4^- D ClO^- and ClO3^-
Answer this question and get it marked →What increases for each successive element in Period 3 from sodium to sulfur? A the highest oxidation number of the element seen in an oxide B the melting point of the elements C…
Answer this question and get it marked →Which statement about an ammonium ion is correct? A All of the H–N–H bond angles in the ion are 90°. B All of the H–N–H bond angles in the ion are 107°. C The ion contains a N–H…
Answer this question and get it marked →An alcohol, U, is reacted with hot acidified K2Cr2O7 solution. The organic product of the reaction contains 58.8% C, 9.8% H and 31.4% O by mass. What is the identity of alcohol U?…
Answer this question and get it marked →Which row shows a primary, a secondary and a tertiary alcohol? A primary: propan-1-ol, secondary: propan-2-ol, tertiary: propane-1,2-diol B primary: 2-methylpropan-1-ol,…
Answer this question and get it marked →1-chloro-2-methylbutane reacts with sodium cyanide in a nucleophilic substitution reaction. What is the most likely intermediate or transition state in this reaction? A…
Answer this question and get it marked →When 0.010 mol of a hydrocarbon X reacts with 720 cm^3 of hydrogen at room conditions, an alkane is formed. What is hydrocarbon X? A A di-substituted benzene with two vinyl groups…
Answer this question and get it marked →An alkene reacts with hot concentrated acidified KMnO4 to produce a single organic product as shown: the product is a methyl ketone attached to a carboxylic acid chain. What is…
Answer this question and get it marked →Testosterone is an optically active organic molecule (structure shown with fused ring system, ketone and alcohol). How many chiral centres are there in one molecule of…
Answer this question and get it marked →Quinone is an unsaturated molecule (para-quinone structure: two C=O groups on a cyclohexadiene ring). Which statement about quinone is correct? A Quinone is non-planar and has an…
Answer this question and get it marked →Which reagent would react with 1-bromopropane to give the highest yield of propene? A ammonia B aqueous potassium hydroxide C potassium cyanide D ethanolic sodium hydroxide
Answer this question and get it marked →Acidified potassium dichromate(VI), K2Cr2O7, is added to propan-1-ol and the mixture is immediately distilled. The distillate is treated with HCN in the presence of KCN. What is…
Answer this question and get it marked →Compound Q gives positive results when tested separately with alkaline I2(aq) and with Tollens' reagent. What is compound Q? A CHOCH2CH2CHO B CH3CH2COCHO C CH3COCH2CHO D CH3COCOCH3
Answer this question and get it marked →Structural isomerism and stereoisomerism should be considered when answering this question. How many isomeric esters of methanoic acid can be made with the molecular formula…
Answer this question and get it marked →The juice of one lemon reacts completely with 120 cm^3 of 0.50 mol dm^-3 sodium carbonate solution. The formula of citric acid is HOOCCH2C(OH)(COOH)CH2COOH. No sodium carbonate is…
Answer this question and get it marked →Separate samples of 1-bromopropane are used in two different reactions. reaction 1 1-bromopropane is converted into compound X by heating it under pressure with ammonia in…
Answer this question and get it marked →The diagram shows part of a polymer chain (alternating CN groups on every other carbon). Which monomer would form this polymer? A CH2=CHCN (acrylonitrile, vinyl cyanide) B…
Answer this question and get it marked →The mass spectrum of element Z is shown. There are peaks at approximately m/e = 35 and 37 (abundance ~3:1) and at m/e = 70, 72 and 74. What is element Z? A arsenic B chlorine C…
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