2022 JYSS Chem Prelims P2

CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER CHEMISTRY 6092/02 Paper 2 26 August 2022 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. Section A Answer all questions in the spaces provided. Section B 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 24. The use of an approved scientific calculator is expected, where appropriate. This document consists of 23 printed pages and 1 blank page. General Certificate of Education Ordinary Level JUYING SECONDARY SCHOOL, SINGAPORE Secondary Four Express Preliminary Examination

2 Section A Answer all the questions in this section in the spaces provided. The total mark for this section is 50. A1 (a) Fig. 1.1 shows part of the Periodic Table. Fig. 1.1 Answer the questions using only the symbols of the elements in Fig. 1.1. Each symbol may be used once, more than once or not at all. State the symbol of an element that: (i) is a monoatomic gas at room temperature; …………………………………………………………………………….……. [1] (ii) is used to test for unsaturated hydrocarbons; …………………………………………………………………………….……. [1] (iii) displaces bromine from its halide; …………………………………………………………………………….……. [1] (iv) has 24 protons in each atom; …………………………………………………………………………….……. [1] (v) forms an amphoteric oxide. …………………………………………………………………………….……. [1] I II III IV V VI VIII VII H Mg K Ca Cr Fe Cu Zn Al Cl N O Ne Br I

3 (b) An atom has the electronic configuration 2, 8, 4. State which period and group the atom belongs to in the Periodic Table. ……………………………………………………………………………………..….. [1] (c) To find out the nucleon number of a Cl atom, a student checks the Periodic Table and records the nucleon number as 35.5. Explain why the student is incorrect and what should be done instead. ……………………………………………………………………………………………. ……………………………………………………………………………………………. ………………………………………………………………………………………… [2] [Total: 8]

4 A2 Fig. 2.1 shows an electrolytic cell. The terminals of the battery are labelled as 1 and 2, while the graphite electrodes are labelled as X and Y. A few drops of Universal Indicator are added to the electrolyte. Fig. 2.1 (a) When the experiment begins , colourless gas es are observed to form at both electrodes. Table 2.2 shows