2020 SNGS Y4IP EOY P1

This document consists of 18 printed pages. [Turn over Name: _________________________ ( ) Class:_____________ SECONDARY 4 INTEGRATED PROGRAMME END OF YEAR ASSESSMENT 2020 __________________________________________________________________________ CHEMISTRY Paper 1 2 October 2020 1 hour __________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name, register number, and class on the OAS sheet using a soft pencil. 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 correct answer and record the corresponding letter using a soft pencil on the OAS sheet. Amendments may be done using a soft eraser. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. A calculator may be used. A copy of Periodic Table is provided on page 2. The total number of marks for this paper is 40. For Examiner’s Use Total (40)

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3 1 An excess of dilute sulfuric acid was added to a sample of sodium sulfite , Na2SO3 crystals and the following reaction occurred: Na2SO3 + H2SO4  SO2 + Na2SO4 + H2O The gas evolved was then dried and collected using a suitable method. What is the most suitable drying agent and gas collection method that can be used to obtain a dry sample of the gas evolved? drying agent gas collection method A anhydrous copper(II) sulfate gas syringe B calcium oxide downward delivery C calcium oxide water displacement D concentrated sulfuric acid upward delivery 2 The melting and boiling points of substances X and Y are given below. substance melting point/ °C boiling point/ °C X 801 1465 Y 15 86 Which is the most suitable method to separate X and Y at room temperature and pressure? A crystallisation B filtration C fractional distillation D simple distillation

4 3 An experiment was carried out to separate two components in a mixture using chromatography with water as the solvent. The chromatogram below shows the result of the experiment. Keeping all other conditions the same, what can be done to prevent the two components from overlapping with each other? A Allow the solvent front to travel a shorter distance. B Draw the start line lower so that it will be submerged in the solvent. C Ensure the spot of the mixture is smaller at the initial position on the start line. D Use a longer chromatogram and allow the solvent front to travel the same distance. 4 Ammonium perchlorate has a formula of NH4ClO4. What is the formula of iron(III) perchlorate? A FeClO4 B Fe(ClO4)3 C Fe3ClO4 D FeH4(ClO4)3 5 A sample of liquid ammonia is collected in a flask and analysed. Which of the following best describes the