2025 RI H2Chem Prelims P2 Questions

© Raffles Institution 2025 9729/02/S/25 [Turn Over RAFFLES INSTITUTION 2025 YEAR 6 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY 9729/02 Paper 2 Structured Questions 16 September 2025 2 hours Candidates answer on the Question Paper. Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Do not open this question booklet until you are told to do so. Write your name, class and index number in the spaces at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. A Data Booklet is provided. Do not write anything in it. You are reminded of the need for good English and clear presentation in your answers. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 / 13 2 / 15 3 / 15 4 / 16 5 / 16 Total / 75 This document consists of 24 printed pages.

© Raffles Institution 2025 9729/02/S/25 [Turn Over 2 Answer all questions in the space provided. 1 Table 1.1 lists the 7th, 8th, 9th and 10th ionisation energies, in kJ mol –1, of four consecutive elements A, B, C and D in the Periodic Table. These elements have an atomic number of less than 20. Table 1.1 element 7th ionisation energy 8th ionisation energy 9th ionisation energy 10th ionisation energy A 27 110 31 720 36 620 43 180 B 11 020 33 600 38 600 43 960 C 12 000 13 840 40 760 46 190 D 11 340 14 940 16 960 48 610 (a) Give the equation, with state symbols, for the 7th ionisation energy of B. ……………………………………………………………………………………..……………… [1] (b) Deduce which element is a noble gas. ……………………………………………………………………………………..………………….. ……………………………………………………………………………………..………………….. ……………………………………………………………………………………..………………….. ……………………………………………………………………………………..………………….. ……………………………………………………………………………………..………………….. ……………………………………………………………………………………..……………… [2] (c) (i) State the identity of A. ……………………………………………………………………………………………… [1] (ii) Complete the diagram to show the arrangement of electrons in the orbitals of an atom of A. 1s 2s 2p 3s 3p ……………………………………………………………………………………..…......... [1]

© Raffles Institution 2025 9729/02/S/25 [Turn Over 3 (d) State and explain how the 2nd ionisation energy of D compares to the 1st ionisation energy of C. ……………………………………………………………………………………..………………….. ……………………………………………………………………………………..………………….. ……………………………………………………………………………………..………………….. ……………………………………………………………………………………..…………………..