2022 WSSS Chem Prelims P2

West Spring Secondary School Preliminary Examination 2022 CHEMISTRY Paper 2 6092/02 SECONDARY 4 EXPRESS Name ( ) Date 26 August 2022 Class Duration 1 hour 45 minutes Additional materials: Laminated Periodic Table READ THESE INSTRUCTIONS FIRST Write your index number, class 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. The number of marks is given in brackets [ ] at the end of each question or part question. A copy of the Periodic Table is provided separately. The use of an approved scientific calculator is expected, where appropriate. FOR EXAMINER’S USE Section A / 50 Section B / 30 Total / 80 This document consists of 20 printed pages including the cover page. Setter: Mdm Sharena [Turn over The image part with relationship ID rId9 was not found in the file.

2 Section A Answer all questions in this section in the spaces provided. The total mark for this section is 50. A1 Choose from the following reactions/processes to fill in the blanks. Each reaction/process may be used once, more than once or not at all. Precipitation Displacement Reduction Decomposition Neutralisation Combustion Oxidation Dissociation (a) When potassium hydroxide and carbonic acid reacts, … ……………………………. . occurs. [1] (b) Iron undergoes ………………………………... during rusting. [1] (c) Copper(II) carbonate undergoes ……………………………….. to form copper(II) oxide and carbon dioxide. [1] (d) Copper(II) oxide can undergo ……………………………….. to form copper, by reacting with hydrogen. [1] (e) Methane undergoes ……………………………….. when it reacts with air to produce carbon dioxide and water vapour. [1] [Total: 5] A2 Chromatography can be used to separate components of a mixture. A student used paper chromatography to analyse a black food colouring. The student placed spots of known food colours, A, B, C, D and E, and the black food colouring on a sheet of chromatography paper and carried out paper