Title Feb-March_2025_9701_22_QP - Crack A Level.pdf ✅

This document has 12 pages. [Turn over Cambridge International AS & A Level CHEMISTRY 9701/22 Paper 2 AS Level Structured Questions February/March 2025 1 hour 15 minutes You must answer on the question paper. No additional materials are needed. INSTRUCTIONS ● Answer all questions. ● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs. ● Write your name, centre number and candidate number in the boxes at the top of the page. ● Write your answer to each question in the space provided. ● Do not use an erasable pen or correction fluid. ● Do not write on any bar codes. ● You may use a calculator. ● You should show all your working and use appropriate units. INFORMATION ● The total mark for this paper is 60. ● The number of marks for each question or part question is shown in brackets [ ]. ● The Periodic Table is printed in the question paper. ● Important values, constants and standards are printed in the question paper. *3828105455* DC (PQ/SW) 340025/5 © UCLES 2025 , , * 0000800000001 * ¬Wz> 4mHuOaE_|5W ¬ivrY¦«xQtXJdLju ¥¥U5u¥uueEEE5U
2 © UCLES 2025 9701/22/F/M/25 1 Phosphorus and chlorine are elements in Period 3 of the Periodic Table. (a) Chlorine forms three different compounds with phosphorus. The most common compounds are PCl 3 and PCl 5 . (i) Complete Table 1.1. Table 1.1 compound oxidation number of P oxidation number of Cl PCl 3 PCl 5 [2] (ii) In a closed system, PCl 3 and PCl 5 exist in an equilibrium mixture as shown in reaction 1. reaction 1 PCl 3 (l) + Cl 2 (g) PCl 5 (s) ΔH = –124kJmol–1 Deduce two conditions that favour the production of PCl 5 in reaction 1. 1 ........................................................................................................................................ 2 ........................................................................................................................................ [2] (iii) The third compound of phosphorus and chlorine, W, has a relative molecular mass, Mr , between that of PCl 3 and PCl 5 . The compound contains 69.6% by mass of chlorine. Determine the molecular formula of W. molecular formula of W = ......................................................... [2] (iv) W is a liquid at room temperature and pressure. It reacts vigorously with water to form an acidic solution. Suggest the structure and bonding in W. Explain your answer. ........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [2] * 0000800000002 * , , ĬÕú3⁄4Ġ ́íÈõÏĪÅĊÞú·þ× ĬéøñÜĢğĒêöĆ»òÚüĒíĂ ĥμąÕõĕåĕåμõąÅÕåÕĕÕ DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN
3 © UCLES 2025 9701/22/F/M/25 [Turn over (b) Fig. 1.1 shows a reaction scheme involving P4 and Cl 2 . Cl 2 (g) reaction 2 excess O2 (g) reaction 3 H2O reaction 4 C reaction 6 PCl 5 P4 A(s) Cl Cl B(aq) H2O reaction 5 Fig. 1.1 (i) Suggest what is observed in reaction 2. ..................................................................................................................................... [1] (ii) Predict the shape of a molecule of PCl 5 . ..................................................................................................................................... [1] (iii) Write an equation for the formation of A in reaction 3. ..................................................................................................................................... [1] (iv) Name B, which is formed in both reactions 4 and 5. ..................................................................................................................................... [1] (v) Draw the structure of C, used in reaction 6. [1] * 0000800000003 * , , Ĭ×ú3⁄4Ġ ́íÈõÏĪÅĊÞü·þ× Ĭé÷òÔĨģĢÏĄûîæâàĒýĂ ĥμõĕμõÅõμÅåąÅμÅĕąÕ DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN
4 © UCLES 2025 9701/22/F/M/25 (c) 1,2-dichloroethane, ClCH2CH2Cl, reacts with NaOH to produce an unsaturated compound, C2H3Cl, as shown in reaction 7. reaction 7 ClCH2CH2Cl + NaOH C2H3Cl + H2O + NaCl (i) State what is meant by unsaturated. ........................................................................................................................................... ..................................................................................................................................... [1] (ii) State the conditions for reaction 7. ..................................................................................................................................... [1] (d) Compound D contains carbon, hydrogen and chlorine only. Fig. 1.2 shows the mass spectrum of D. 20 0 20 40 60 80 100 30 40 m/e abundance /% 50 60 1 2 Fig. 1.2 (i) Explain the relative abundance of peaks 1 and 2 in the mass spectrum in Fig. 1.2. ........................................................................................................................................... ..................................................................................................................................... [1] (ii) Suggest the structure of D. [1] [Total: 17] * 0000800000004 * , , ĬÕú3⁄4Ġ ́íÈõÏĪÅĊàú·Ā× Ĭé÷óÔĞđħìþôõĈþþĂõĂ ĥąåĕõõÅÕÕĥÕąąμĥĕĕÕ DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN