ASRJC 2024 H1Chem Prelim P2 Q&A

ASRJC JC2 Prelim 2024 8873/H1 [Turn over ANDERSON SERANGOON JUNIOR COLLEGE 2024 JC 2 Preliminary Paper NAME:______________________________ ( ) CLASS: 24 / ___ CHEMISTRY 8873/02 Higher 1 11 Sept 2024 2 hours 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 __ printed pages and ___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] P [Ne]3s23p3 S [Ne]3s23p4 Cl [Ne]3s23p5 number of electrons in 3p subshell 3 4 5 number of unpaired electrons 3 2 1 (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] • Nuclear charge remains unchanged for an atom 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 • As electrons are removed from the outermost shell , there will be a decrease in shielding effect. • Electrostatic forces of attraction between the nucleus and remaining outer electrons increases. • More energy is required to remove electrons resulting in a general increase in successive ionisation energies. (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 eleme