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, ……………………………………………………………