ASRJC 2024 H1Chem Prelim P2 QP

ASRJC JC2 Prelim 2024 8873/H1 [Turn over ANDERSON SERANGOON JUNIOR COLLEGE 2024 JC 2 PRELIMINARY EXAMINATION NAME:______________________________ ( ) CLASS: 24 / ___ CHEMISTRY 8873/02 Higher 1 11 September 2024 2 hours Candidates answer on the Question Paper. Additional Materials: Data Booklet READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces provided at the top of this page. Write in dark blue or black pen. You may use a pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Section B Answer one question. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. Section A 1 / 10 Section B 7/8 / 20 2 / 11 Paper 1 / 30 3 / 14 Paper 2 / 80 4 /7 Percentage Overall 5 / 7 6 /11 Grade This document consists of 22 printed pages and 2 blank pages.

2 ASRJC JC2 Prelim 2024 8873/H1 Section A Answer all the questions in this section in the spaces provided. 1 (a) Phosphorus, sulfur and chlorine are Period 3 elements of the Periodic Table. Table 1.1 shows some properties of the elements P to Cl. Table 1.1 P S Cl number of electrons in 3p subshell number of unpaired electrons Complete Table 1.1 to show the number of electrons in the 3p subshell and the number of unpaired electrons in an atom of P, S and Cl. [2] (b) Fig. 1.1 shows successive ionisation energies of sulfur, S. Fig. 1.1 (i) Explain the general increase in successive ionisation energies for any atom. ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………………………………………………………………... ……………………………….………………………………………………….[2] 0 5000 10000 15000 20000 25000 30000 Ionisation energy / kJ mol–1 1st 2nd 3rd 4th 5th 6th 7th successive ionisation energies of S

3 ASRJC JC2 Prelim 2024 8873/H1 [Turn over (ii) Complete Fig. 1.1 by plotting approximate values for the 2nd successive ionisation energy and the 6th successive ionisation energy of S. [2] (c) Describe the variation in the electrical conductivity of the elements in the third period, sodium to chlorine. Explain this variation in terms of the structures and bonding of the elements. ………………………………………………...…………………………………………... ………...…………………………………………………………………………………... ………..………………….………………………………………………………………... …………...…………………………………