2022 CCHS(M) Chem Prelims P2

[Turn over Name: Class: Class Register Number: Parent’s Signature ______________________ PRELIMINARY EXAMINATION 2022 SECONDARY 4 CHEMISTRY 6092/02 Paper 2 12 September 2022 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and register number clearly in the spaces provided at the top of this page. 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. 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 / 50 Section B B6 / 12 B7 / 8 B8 ( ) / 10 Total / 80 This document consists of 24 printed pages.

2 2022 Preliminary Exam/CCHMS/Secondary 4 /Chemistry/6092/02 Section A Answer all questions in this section in the spaces provided. The total mark for this section is 50. A1 The formulae of some gases are given in the following list. NH3 O2 CO Cl2 He CO2 SO2 NO H2 CH4 Choose formulae from above to answer the following questions. You may use each formula once, more than once or not at all. (a) Give the formulae of two gases which are elements. .................……………………………………………………………………………………….. [1] (b) Give the formulae of two gases that will change the colour of a damp red litmus paper. .................……………………………… and …………… …... ……………………………….. [1] (c) Give the formulae of two gases that are involved in both respiration and photosynthesis. .................……………………………… and …………… …... ……………………………….. [1] (d) Give the formula of a gas that contains an element with an oxidation state of –4. .................……………………………………………………………………………………….. [1] (e) Give the formula of a gas which is oxidised in the catalytic convertor. .................……………………………………………………………………………………….. [1] [Total: 5]

3 2022 Preliminary Exam/CCHMS/Secondary 4 /Chemistry/6092/02 [Turn over A2 The table shows some information about the atoms of elements A, B, C, D, E and F. (The letters do not represent the atomic symbols of the elements.) element number of protons number of neutrons nucleon number A 8 6 14 B 7 7 14 C 37 85 D 19 20 39 E 8 9 17 F 26 30 (a) (i) Fill in the blanks in the table above.