GESS 3EXP CHEM EYE P2 2023

This paper consists of 19 pages including the cover page GAN ENG SENG SCHOOL End-of-Year Examination 2023 CANDIDATE NAME CLASS INDEX NUMBER CHEMISTRY Paper 2 Sec 3 Express 6092/02 6 October 2023 1 hour 45 minutes Candidates answer on the Question Paper. Calculators are allowed in the examination. READ THESE INSTRUCTIONS FIRST Write your class, 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/tape. 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 19. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use Section A Section B Total 80

2 GESS 3EXP CHEM P2 EYE 2023 TKG SECTION A [70 marks] Answer ALL the questions in the spaces provided. A1 Fig. 1.1 shows part of the Periodic Table. 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 atomic symbol for an element which (a) has three electrons in its valence shell, …………………………………………………………………………………….. [1] (b) is metallic and forms coloured compounds, …………………………………………………………………………………….. [1] (c) forms a basic oxide, …………………………………………………………………………………….. [1] (d) has less than 20 protons and has four electron shells, …………………………………………………………………………………….. [1] (e) is an inert gas, …………………………………………………………………………………….. [1] (f) has a giant covalent structure, …………………………………………………………………………………….. [1] (g) is a liquid at room temperature, …………………………………………………………………………………….. [1] [Total: 7]

3 GESS 3EXP CHEM P2 EYE 2023 TKG A2 Table 2.1 shows the distribution of some elements in three substances. Table 2.1 element substance oxygen iron carbon A 0% 90.4 – 95.6% 4.4 – 9.6% B 52% 48% 0% C 66.7% 0% 33.3% Identify and explain, using data from Table 2.1, which substance is a mixture. …………………………………………………………………………………………… …………………………………………………………………………………………… [2] [Total: 2] A3 Haematite, iron(III) oxide, is an iron ore that can be commonly found around the world. (a) Haematite can be reduced with carbon to form two products. Write the balanced chemical equation, with state symbols, for this reaction. …………………………………………………………………………………….. [2] (b) The reaction in (a) is said to be non -environmentally friendly. Suggest a reason why. …………………………………………………………………………………….. [1] (c) A student, Harini, commented, “Iron(III) oxide can also