2022 MSS Chem Prelims P2

Name: ……………………………………………… ( ) Class: ……………… Secondary 4 Express CHEMISTRY 6092/02 Paper 2 24 Aug 2022(Wed) 1 hour 45 minutes 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 a pencil for any diagrams, graphs, tables or rough working. Do not use staples, paper clips, glue or correction fluid. Section A [50 marks] Answer all questions in the spaces provided. Section B [30 marks] Answer all three questions, the last question is in the form either/or. Answer all questions in the spaces provided. 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 22. The use of an approved scientific calculator is expected, where appropriate. This document consists of 22 printed pages. Setter: Mr Ramesh MONTFORT SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022

2 Section A (Total 50 marks) Answer all the questions in the spaces provided. A1 Name the method of separation used in each of the following processes. [4] Process Method of separation (a) To obtain iodine from a mixture of iodine and sodium chloride. (b) To obtain petrol from a mixture of water and petrol. (c) To obtain the salt formed when hydrochloric acid reacts with sodium hydroxide. (d) To obtain butane from crude oil. (e) To obtain the product formed when carbon dioxide is bubbled into calcium hydroxide. [Total:4]

3 A2 The table shows some information about substances A to D. substance melting point/ °C boiling point/ °C Does it conduct electricity when it is a solid? Does it conduct electricity when molten? A -7 59 no no B 1251 1970 no yes C 1240 2100 yes yes D 1650 2230 no no (a) Use only the letters A, B, C or D to answer the following questions. (i) Which substance is most likely to be a metal? ……………………………………………………………………… [1] (ii) Which substance is a reddish brown liquid at room temperature and which could be used to test if an organic compound is saturated? ………………………………………………………………………..[1] (iii) Which substance is most likely to be sand? ………………………………………………………………………..[1] (b) (i) What type of bonding is present in substance B? ………………………………………………………………………..[1] (ii) Explain your answer. …………………………………………………………………………... ………………………………………………………………………...... ………………………………………………………………………..[2] [total:6]

4 A3 (a) Complete the following table about the preparation of soluble salts. Give the chemical formulae of all reagents and salts which are to be used in the preparation of the