SMSS 2023 4NA Prelim P4

This document consists of 11 printed pages. ST. MARGARET’S SCHOOL (SECONDARY) Preliminary Examinations 2023 CANDIDATE NAME CLASS REGISTER NUMBER SCIENCE (PHYSICS,CHEMISTRY) SCIENCE (CHEMISTRY,BIOLOGY) Paper 4 Chemistry Secondary 4 Normal (Academic) 5105/04, 5107/04 17 August 2023 1 hour 15 minutes Additional Materials: NIL 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 on both sides of the paper. You may use a pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided on the question paper. Section B Answer any two questions. Write your answers in the spaces provided on the question paper. 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. A copy of the Periodic Table is printed on page 11. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use Section A 14 Section B 16 Total 30 Parent’s Signature

2 SMS(S) 2023 Section A [14 marks] Answer all questions. Write your answers in the spaces provided on the question paper. A1 A list of substances is given below. Ag Cl2 H2 MgCl2 Na2O SiO2 ZnO You may only use each substance once. From the list, choose the substance which (a) can react with both acid and alkali. (b) is produced when magnesium reacts with sulfuric acid. (c) can be dissolved in water to form a solution with pH greater than 7. (d) can displace iodine from aqueous potassium iodide. [4] [Total: 4] A2 Table 2.1 shows the number of protons and nucleons in six particles. Table 2.1 particle proton number nucleon number T 3 7 U 8 16 V 11 23 W 13 26 X 13 27 Z 18 40 (a) Which particle exists as monatomic element in nature? (b) Which particles are isotopes of the same element? (c) Which particle belongs to Group I of the Periodic Table? [3]

3 SMS(S) 2023 (d) Draw a ‘dot and cross’ diagram for the compound formed when particle W reacts with particle U, showing only the outermost electrons. [2] [Total: 5] A3 Propene can react with hydrogen, in the presence of a suitable catalyst, to form propane. The chemical equation for the reaction is as below: C3H6 + H2 → C3H8 (a) Draw the structural formula for propene in the box provided. [1] (b) Name the conditions required for the reaction between ethene and hydrogen. [1] (c) Describe a test to distinguish propene from