2022 SKSS Chem Prelims P1

[Turn over Name and Index Number: ( ) Class: SENG KANG SECONDARY SCHOOL PRELIMINARY EXAMINATION CHEMISTRY 6092/01 Secondary 4 Express 30 August 2022 Paper 1 Multiple Choice 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your index number and name on all the work you hand in. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. There are forty questions in this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and re cord your choice in soft pencil on the Multiple Choice Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this question paper. The use of an approved scientific calculator is expected, where appropriate. A copy of the Periodic Table is printed on page 18. Parent’s / Guardian’s Signature: ………………….…………... This document consists of 17 printed pages and 1 blank page. Do not turn over the page until you are told to do so. ���

2 [Turn over 1 The formula of magnesium oxide can be investigated from heating magnesium with oxygen to form magnesium oxide. Which apparatus are used for this investigation? A 1 and 2 only C 2 and 3 only B 1 and 3 only D 1, 2 and 3 2 A student set up the apparatus as shown. What is the gas that will be collected from the set-up and which drying agent that should be used? name of gas drying agent A ammonia concentrated sulfuric acid B ammonia calcium oxide C hydrogen chloride calcium oxide D hydrogen chloride concentrated sulfuric acid ���

3 [Turn over 3 Which statement about methods of purification and analysis is correct? A A liquid that boils over a range of temperatures may still be 100% pure. B An insoluble substance may be separated from water by crystallisation. C Chromatography may only be used to separate coloured substances. D Liquid air can be fractionally distilled, giving oxygen as one of the products. 4 Mary performed paper chromatography on a dye and obtained only one spot with an Rf value of 0.68. Which statement is true about her chromatogram? A Changing the solvent will not affect the Rf value. B Using a more concentrated dye solution will increase the Rf value. C The dye is likely to be a pure substance. D The spot is closer to the starting line than it is to the solvent front. 5 The apparatus is set up, using different gases in two inverted beakers. Which pair of gases would cause an upward movement of the water lev