CHIJ 2024 Sec 4E5N Prelim Sc(Chem) P3

O CONVENT OF THE HOLY INFANT JESUS SECONDARY Preliminary Examination in preparation for the General Certificate of Education Ordinary Level 2024 CANDIDATE NAME CLASS REGISTER NUMBER SCIENCE (CHEMISTRY) Paper 3 Chemistry Candidates answer on the Question Paper. No Additional Materials are required. 5086/03 or 5088/03 22 August 2024 1 hour 15 minutes READ THESE INSTRUCTIONS FIRST Write your name, class and register number on all the work you hand in. You may use an HB pencil for any diagrams, graphs or rough working. Write in dark blue or black pen. Do not use staples, paper clips, glue, correction fluid or correction tape. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Section A Answer all questions. Write your answers in the spaces provided on the question paper. Section B Answer one question. Write your answers in the spaces provided on the question paper. A copy of the Data Sheet is printed on page 17. A copy of the Periodic Table is printed on page 18. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 18 printed pages. [Turn over

2 CHIJSec/2024/OLevelPrelim/5086or5088/03 Section A Answer all questions in the spaces provided. 1 Choose from the list of compounds to answer these questions. calcium oxide carbon dioxide carbon monoxide calcium hydroxide lead(II) chloride potassium oxide sodium nitrate sodium sulfate sulfur dioxide water Each compound may be used once, more than once or not at all. Identify the substance which (a) is a gas that forms a white precipitate in limewater, ……………………………………………………………………………………………... [1] (b) is a gas that turns acidified potassium manganate(VII) from purple to colourless ……………………………………………………………………………………………... [1] (c) contains an anion with a charge of -1, ……………………………………………………………………………………………... [1] (d) is a basic oxide, ……………………………………………………………………………………………... [1] (e) is used in farms to neutralise the pH of the soil. ……………………………………………………………………………………………... [1] [Total: 5]

3 [Turn over CHIJSec/2024/OLevelPrelim/5086or5088/03 2 Use the Periodic Table of Elements to help in answering this question. (a) Lead is a metal with proton number of 82. (i) State the number of occupied electron shells in an atom of lead. ………………………………………………………………………………………… [1] (ii) State the number of electrons in the outer shell of an atom of lead. ………………………………………………………………………………………… [1] (b) Explain briefly why (i) the elements from Group 1 all have similar chemical properties, ……………………………………………………………………………………………… ………………………………………………………………………………………… [1] (ii) the elements in Group 17 act as non-metals. ……………………………………………………………………………………………… ………………………………………………………………………………………… [1] [Total: 4]

4 CHIJSec/2024/OLevelPrelim/5086or5088/03 3 Table 3.1 describes four substances. Table 3.1 substance description A A colourless liquid that can be separated into two substances by evaporation. B A substance with fixed melting and boiling point C A substance that can be separated into simpler substances by electricity only D Only carbon dioxide is formed when the substance is burnt in air Classify the four substances as element, compound, mixture or either an element or a compound. Complete Table 3.2 by placing a tick (√ ) in one box in each row. Table 3.2 substance element compound mixture either an element or a compound A B C D [Total: 4]

5 [Turn over CHIJSec/2024/OLevelPrelim/5086or5088/03 4 Substance W is a mixture of compound P and element Q. The reaction scheme shows the results of some experiments on substance W. (a) Identify substances P, Q, R, S and T. P ………………………………………………………………… Q ………………………………………………………………… R ………………………………………………………………… S ………………………………………………………………… T ………………………………………………………………… [5] (b) Write the ionic equation, with state symbols, for the formation of white precipitate U. ……………………………………………………………………………………………... [1] (c) Describe how you would separate compound P from the pale blue filtrate P. ……………………………………………………………………………………………………. ……………………………………………………………………………………………………. ……………………………………………………………………………………………………. ……………………………………………………………………………………………………. ……………………………………………………………………………………………... [3] [Total: 9] white precipitate formed, soluble in excess aqueous ammonia acidified silver nitrate solution dilute sodium hydroxide dilute nitric acid and aqueous barium nitrate white precipitate, U colourless gas S that burns with a ‘pop’ sound colourless solution blue precipitate, T, insoluble in excess sodium hydroxide white precipitate, R grey residue Q substance W pale blue filtrate P warm with dilute hydrochloric acid add water and filter dilute ammonia solution

6 CHIJSec/2024/OLevelPrelim/5086or5088/03 5 Sulfur dioxide is bubbled through yellow iron(III) chloride solution. The equation for the reaction is given below. 2FeCl3(aq) + 2H2O(l) + SO2(g) → 2FeCl2(aq) + 2HCl(aq) + H2SO4(aq) (a) Describe the colour in appearance of the iron(III) chloride solution when sulfuric dioxide is bubbled through it. ………………………………………………………………......…………………………… [1] (b) Which substance is oxidised? Explain your answer in terms of oxidation state. ………………………………………………………………….………………………………... ……………………………………………………………………….…………………………... ………………………………………………………………….………………………………... ………………………………………………………………......…………………………… [2] [Total: 3]

7 [Turn over CHIJSec/2024/OLevelPrelim/5086or5088/03 6 Fig 6.1 shows some reaction of butene. Fig. 6.1 (a) Identify A, B and D. A ………………………………………………………………… B ………………………………………………………………… D ………………………………………………………………… [3] (b) Gas C is an atmospheric pollutant. Describe the toxic nature of gas C on human beings. ………………………………………………………………………….…………………..…..… …………………………………………………………………………………….………....…… …….………………………………………………………………………………………… [1] (c) Draw the structure of organic liquid E. [1] [Total: 6] complete combustion hydrogenation addition of chlorine incomplete combustion gas A and liquid B liquid B and gas C organic gas D organic liquid E

8 CHIJSec/2024/OLevelPrelim/5086or5088/03 7 Bromate(V) ions, BrO3 –, react with bromide ions, Br –, in an acidic solution to form bromine water. BrO3–(aq) + 5Br –(aq) + 6H+(aq) → 3Br2(aq) + 3H2O(l) (a) (i) Universal Indicator is added into the solution at the start of the experiment. What is the colour shown by the indicator? …………………………………………………………………………………….. [1] (ii) Explain why the acidity of the reaction mixture decreases as the reaction proceeds. ……………………………………………………………………………………..…….. ……………………………………………………………………………………….. [1] (b) This reaction is exothermic. Define the term exothermic. ………………………………………………………………………………………..…………... ……………………………………………………………………………..………..………... [2] (c) Fig 7.1 shows the displayed formula of fumaric acid. Fig. 7.1 Describe what will be observed when bromine water is added to fumaric acid. Give a reason for your answer. observation ……………………………………………..……………………………………… reason ………………………………………………………………………………………. [2] [Total: 6]

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