Copy of KCPSS_2024_4E_Chem_Prelim_P2

[Turn Over KUO CHUAN PRESBYTERIAN SECONDARY SCHOOL 2024 PRELIMINARY EXAMINATION Secondary 4 Express NAME CLASS REG. NO CHEMISTRY 6092 / 02 Paper 2 22 August 2024 Setter: Ms Koh Li Eng 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 2B pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. 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 24. The use of an approved scientific calculator is expected, where appropriate. FOR EXAMINER’S USE Section A 70 Section B 10 Total 80 This document consists of 23 printed page and 1 blank page.

2 KCPSS 2024/Sec 4Exp Prelim Chem P2 [Turn Over Section A Answer all questions. 1 Fig. 1.1 shows part of the Periodic Table with some elements. Fig. 1.1 Use the symbols of the elements from Fig. 1.1 to answer the questions. Each element may be used once, more than once or not at all. (a) Which element is inert? ...................................................................................................................... [1] (b) Which elements have an atomic mass of 40? ...................................................................................................................... [1] (c) Which elements exist as a black solid? ...................................................................................................................... [1] (d) Which element forms a carbonate that is the most thermally stable? ...................................................................................................................... [1] (e) Which elements are used to make brass? ...................................................................................................................... [1] (f) Which elements can be used as electrodes in the electrolysis of water? ...................................................................................................................... [1] [Total: 6] H Br Cl At Zn Ca Fe C Pt Ar Na Cu

3 KCPSS 2024/Sec 4Exp Prelim Chem P2 [Turn Over 2 Complete the table to name the most appropriate separation technique that can be used to obtain the substance underlined in the mixture. mixture separation technique ammonium chloride + sodium chloride water + lead(II) sulfate methanol + glucose solution [3] [Total: 3] 3 An experiment was carried out to investigate the rate of