2020 SNGS Y4IP EOY P2

This document consists of 20 printed pages [Turn over Name: _________________________ ( ) Class: ___________ YEAR FOUR INTEGRATED PROGRAMME END-OF-YEAR ASSESSMENT __________________________________________________________________________ CHEMISTRY Paper 2 2 October 2020 1 h 45 minutes __________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name, register number, and class on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use highlighters, glue, correction fluid or correction tape. Answer all questions. Write all answers on the blanks provided in the question paper. The use of a scientific calculator is expected, where appropriate. You are reminded of the need for clear presentation in your answers. A copy of the Periodic Table is provided on page 2. The number of marks is given in brackets [ ] at the end of each question or part question. The total number of marks for this paper is 80. For Examiner’s Use Section A (50) Section B (30) Total (80)

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3 Section A Answer all the questions in this section in the spaces provided. The total mark for this section is 50. A1 Choose from the following substances to answer the questions below. aluminium sulfate ammonium chloride argon calcium carbonate iodine lead(II) hydroxide manganese(IV) oxide nickel nitrogen dioxide Each substance can be used once, more than once or not at all. List the substance that is (a) in the solid state at room temperature and can be used to lower the activation energy of a reaction, ………………………………………………………………………………………… [1] (b) used to fertilise soil, ………………………………………………………………………………………… [1] (c) added to the blast furnace to remove impurities in the extraction of iron, ………………………………………………………………………………………… [1] (d) amphoteric, ………………………………………………………………………………………… [1] (e) prepared by adding excess metal carbonate to dilute ac id, followed by crystallization, ………………………………………………………………………………………… [1] (f) separated from a mixture by sublimation. ………………………………………………………………………………………… [Total: 6 Marks] [1]

4 A2 Kelly attempted to separate a homogeneous liquid mixture containing three substances that are soluble in each other. The table below shows the melting and boiling points of the three substances. substance melting point / °C boiling point / °C W -114 55 X -95 80 Y 50 340 Kelly carried out fractional distillation and recorded the total volume of distillate collected at various temperatures . She stopped the experiment once the thermometer reached a reading of 85 °C. (a)