2025 ASRJC Prelim H2Chem P2_QP

ASRJC JC2 PRELIM 9729/02/H2 [Turn over ANDERSON SERANGOON JUNIOR COLLEGE 2025 JC 2 PRELIMINARY EXAMINATION NAME:______________________________ ( ) CLASS: 25 / _____ CHEMISTRY 9729/02 Paper 2 Structured Questions 27 August 2025 2 hours Candidates answer on the Question Paper. Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, class and register number on all the work you hand in. 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. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Paper 2 1 /8 2 /16 3 /25 4 /14 5 /12 Total / 75 This document consists of 22 printed pages and 2 blank pages.

2 ASRJC JC2 PRELIM 9729/02/H2 Answer all the questions. 1 (a) Mild steel is an alloy that contains iron and carbon. A sample of mild steel was analysed, and four different types of atoms were identified; A, B, C and D. Table 1.1 shows information about the four types of atoms found in the sample. Table 1.1 atom relative mass relative % abundance A 12.00 0.238 B 13.00 0.012 C 53.94 5.79 D 55.93 93.96 (i) Calculate the relative atomic mass of carbon in this sample to four significant figures. Show your working. [1] (ii) In an experimental set -up, beams of particles travelling at the same speed from different sources are subjected to an electric field as shown in Fig. 1.1. A beam of protons with an angle of deflection of 60° has already been drawn. + protons Fig. 1.1 Under identical conditions, beams of particles 12C2+ and 56Fe2+ were subjected to the same electric field. Calculate the angle of deflection of 12C2+ and 56Fe2+particles under the electric field and sketch the beams of 12C2+ and 56Fe2+ on Fig. 1.1. Label the beams clearly. [2]

3 ASRJC JC2 PRELIM 9729/02/H2 [Turn over (b) The compound C6H6 has many possible structural isomers. Three suggested structures of C6H6 are shown in Fig. 1.2. Kekulé benzene Dewar benzene Ladenburg benzene Fig. 1.2 (i) Using Fig. 1.2, complete Table 1.2 to predict the number of carbon atoms that have sp, sp 2 and sp 3 hybridisation in Kekulé benzene, Dewar benzene and Ladenburg benzene. Table 1.2 C6H6 structure sp hybridised sp2 hybridised sp3 hybridised Kekulé benzene Dew