TKGS 2024 Chem Prelim P2 MS

TANJONG KATONG GIRLS’ SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR EXPRESS CANDIDATE NAME MARK SCHEME CLASS 4 INDEX NUMBER CHEMISTRY 6092/02 Paper 2 12 August 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, index number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE ON ANY BARCODES. 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 26. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use Section A Setter : Ms Vina Ng Markers : Mrs Lee Suan Ching, Ms Esther Foo, Mrs Chan Liying, Ms Vina Ng Section B Total / 80 This document consists of 26 printed pages.

2 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 Section A Answer all questions. 1 (a) Fig. 1.1 shows part of the Periodic Table. H e C N O F Ne S Cl Ar Br Kr Fig. 1.1 Select elements from Fig. 1.1 to answer the following questions. You may use each element once, more than once or not at all. Write down the symbol for an element which (some students gave more than one element): (i) exists as diatomic molecules, N / O / F / Cl / Br [1] No marks awarded if student gives mo re than one answer and there is a wrong answer given among the correct ones. (ii) is a noble gas, He / Ne / Ar / Kr [1] (iii) has seven electrons in its outer shell. F / Cl / Br [1]

3 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 (b) Some versions of the Periodic Table place hydrogen in Group 1 (Fig. 1.2). Other versions place hydrogen alone and not with any other group (Fig. 1.3). Fig. 1.2 Fig. 1.3 (i) Give one similarity between hydrogen and the elements in Group 1. Any one point [1]: They have one electron in the outer shell. They have one valence electron. They form ions with the 1+ charge. They lose one electron to form ions. They react with non-metals. They act as reducing agents. They form charge of +1/1+ They have valency 1 Reject: They have one valence electron shell They have high reactivity The y have oxidation