No 91099119 EE =) fe a ie zl ia Centre Number Candidate Number canine CLO TTT EXAMINATIONS COUNCIL OF ZAMBIA Examination for School Certificate Ordinary Level Science Paper 2 Tuesday 49 NOVEMBER 2019 ‘Additional Matedial(s)” tectonic calculator (non progeamriable) Mathematica tables Soft clan exaser ‘Soft pencl (ye 8 or His recommended) Time 2 hours Instructions to Candidates Donot open this booklet until you are told to,do'so. ‘Write your narie, centre number and Candidate number in the spaces provided atthe top of the page and any separate answer booklet/paper used. “There are three (3) sections in this Paper. Section A There are twenty (20) questions In this section, Answer all questions. For each question, there are four possible answers; A, Bj Cand B. Choose the one you consider corfect and record your choice by making it with a erosé (X) in ink on the aniewer grid providad on the question paper. SectionB ‘Answer all Questions! Write your anguers'in the spaces provided on the question paper. Read very. carefully the instructions on the answer sheet. ‘Section C Answer any.two dyestions. Write your answer on a separate, ~_ answer booklet provided. - Information for candidates section ay ‘Any rough working should be done in this:question paper. | Section: 8 ‘At the end of the examination: ‘seaipn ea 1 Faster the separate answer booklet/papers used securely to the question paper. z 2 Circle the numbers.of the section C questions you have - answered in the grid below. ‘Tepe } ‘The Periodic Table is printed on-page 16. Cell phones are not allowed in the examination room. eee ‘excascn0101s1 This question paper consists of 16 printed pagesPage 3 of 16 SECTION A [20 marks] Answer all the questions on the answer grid provided. [AL Which of the following is an example of the application of chemistry in a home? ‘The use of amplifiers in a radio. ‘The use of cosmetics, Production of ammonia in the Haber process. Industrial production of alcohol, A B c D ‘AZ The best apparatus that is used to accurately measure a required fixed volume of a reagent during titration is ... 25cm A 7 B ‘A3__ The best method to séparate a mixture of sand and diesel is ‘A decantation. B distilation, © (evaporation. D filtration. ‘A4 Identify an inert gas from the diagrams below. o.@ ° 8 8 ee) oO ® @ ® oe Oo Oo @ A B c D ‘Scionce/5124/2/2019 [Turn overPage 4 of 16 AS AG Ay ag The following equation is incomplete: 2LIOH + H2SO, > x What is x? A LiSO, + 2H,0 B LiSO, +H,0 Cc — LiSO, + H,0 D — 2UiSO, + 2H,0 Which of the following molecules has a triple bond? A B CO, c tM DQ ‘The equation below shows the preparation of a salt. AQNOs(2q) + NACh2q) > ACh») + NANOsio0) Which of the following gives the correct description of the equation? Salt Type of Salt | Method of séparation A [Agcl | Insoluble Filtration B NaNO; Soluble Deeantation cf Agcr Soluble Grystalisation D_ [NaNo; Insoluble | Filtration ‘What mass of copper (II) oxide would react completely with S00cm? of a 0.5M dilute sulphuric acid? A 49.09 B 40.09, c 24.59 D 4 200g ‘The table below shows some transition elements and their uses. Which one is the correct. use in the Contact and Haber processes? Catalyst in the Contact process A [ron Vanadium B | Vanadium Tron c | Mercury Vanadium D_ | Vanadiums Lead a Scienca!S 1242/2019A10 AlL Ai2 A13 Ala AIS Page 5 of 16 Which of the arrangements below is suitable for collecting a soluble gas that is denser than air? "el The relative formula mass for calcium hydrogen carbonate, Ca(HCOs)a,. 1s... A 4” B 100. c 142, D162. Which of the following statements explains why magriesium, calcium and barium are placed in Group II of the Periodic Table? A They all have two electrons in thé oltermost shell. B They form basic oxides that are soluble in water. C Their outermost electrons are lost when they react with non-metals. D They form positively charged ions. How many molecules are found in 6.0dm? of carbon dioxide at r.t.p? A 15x10" Bo 3.6 x10" C 3.6 x10, D 15x10" Which of thé following is an alloy?” A Rust B Sliver c Bronze D Tungsten Halogens are useful elements but also cause harm to the environment. Which of the following is a true danger of halogens? They A cause HIV and AIDS in human beings. B deplete the ozone layer. C are used to treat wounds, D all release harmful radiation in the environment. ‘Sclence’5124/2/2019 [Turn overPage 6 of 16 A16 The best way of preventing spanners, pliers and screw drivers from rusting is A. sacrificial protection. B tarring. Coiling. D galvanizing. ‘A17 The gas that combines with haemoglobin and reduce its capacity to carry oxygen in the body is... A nitrogen dioxide. B__ nitrogen monoxide. © carbon dioxide. D carbon monoxide. ‘A18. Which of the following substances is not a synthetic fibre? A Nylon B Cotton C Poly(ethene) D Polyester {A19 The compound represented below is ... 7x -® (OX BP * Ethene. ey Ethyne, Ethane. Ethanol. ‘A20 Whatis the name of the compound below? ooa> on —t—o—a—or, Ethanol Ethanoic acid Ethylethanoate Methylpropanoate vaap Sclenoe/6 124272019Page 7 of 16 Section B [45 marks] ‘Answer all questions in this section. Write your answers in the spaces provided on the question paper. Bi Matter is made up of three basic units. (a) State the three basic units of matter. BI (b) Give the basic units of matter contained in common salt. (4) (©) _ Noble gases like argon are made up of one of the basic unit particles. ‘State the basic unit particles in noble gases. (1 [Total: 5 marks] B2 (a) The table below shows the description Of substances A, B and C. (®° Give the physical state of eachof them. ‘Substance A B ] c Description | Partielés occupy | Particles closely Particles move | ; any space packed. randomiy within tie ™| available space of the substance @ Gi) Git) state of - matter G3 (ii) How can substance € attain the structure of substance A? ie3} (b) Substance B is said to be a pure substance. Give a characteristic which proves that B is a pure:substance when melting. 1 [Total 5 marks] ‘Scienca/6124/2/2018 [Turn overPage 8 of 16 B3 The diagrams below show atoms of sodium arid chlorine. (a) State the type of bond that exists in the compound formed when the two elements combine. QO) (b) (i) _ Draw the structure of the compound formed wheft sodiuft and chlorine combine. O) (ii) State the chemical formula for sodium chloride. (1) (©) _Explain in terms of bonding and structure why sodium chloride has the following properties: (i) Avery high metting point. [1] (ii) High electrical conductivity when molten. 1a) [Total: 5 marks] ScloncalS12472/2019Page 9 of 16 B4 Both barium carbonate and barium sulphate are insoluble in water. (@) Choose a substance from the following list to fill in the blank spaces for the preparation of barium sulphate. sulphuric acid, nitric acid, lead TI sulphate, magnesium sulphate “Barium carbonate is added in excess to a solution of dilute ‘The excess barium carbonate is ftered of to collect a suitable fitrate. The filtrate is then added to a solution of .... sonennes tO produce barium sulphate which is filtered off from the product mixture.”” (2 (b) (i). What type of reaction is used to prepare barium sulphate? ty) i) Construct a balanced equation for the reaction that produces barium sulphate in this particular case. (1) [Total: 4 marks] BB Magnesium Oxide reacts with dilute sulphuric tld as sliown below. MgO + H2SO, -> MgSO, + H,0 600g of magnesium oxide was reacted with 980g of dilute sulphuric acid. (a) Determine the limiting reagent in the reaction above. (3) ‘Sciancel51 2472/2019 [Turn everPage 10 of 16 (b) Calculate the mass of magnesium sulphate that was obtained at the end of the reaction. {21 (©) 1.080g of magnesium sulphate was obtained at the end of the reaction. Calculate the percentage yield. : 2] [Total: 7 marks] Selencel6124/22019Page 11 of 16 B6 The graph below shows the collection of oxygen gas during an experiment over 60 seconds, from 1M hydrogen peroxide. (a) (i) _ Describe how the rate of this reaction changes with time. 1 (ii) At what time does the reaction come to an end?. Give a reasonfor your answer 2] (b) How much yolume of the gas was produced at the time the reaction came to an end? 1e3] (©) Sketch on the same graph a curve obtained if 2M hydrogen peroxide but of the same number of moles were to be used. ie] (Total: 5 marks] ScinnealR 124919019 [Turn overPage 12 of 16 B7 Use the Periodic Table to help you answer this question. (a) Name the element in Group V which is in the same period as sodium. 1] (b) State the number of protons and neutrons in one atom of the element named in (a) above. Protons .. Neutrons 21 (c) Write the electronic configuration of the element named in (a), : iF) (d) Explain why the named element in (a) is placed in GroupV.. u [Total: 5 marks] B8__Brassis an alloy of two elements. (a) Define the term alloy. 1] (b) State the two elements'that make up brass. 1) (©) Draw a gefieral structure that represents the bonding in brass. f) (d)_ Why is a bar of brass harder than a bar of the individual elements it is made of? 1) [Total: 4 marks] Sclonoe/s 124122019Page 13 of 16 B9__ Nylon and terylene are polymers. (a) What is meant by the term polymer? 1e3 (b) Apart from being polymers, give one similarity between the two. f) (© @_ Which of the two polymers is a polyester? Q) (ii) Hence draw the structure of the polymer showing two repeating.units, Encirde any ester link on the chain. 2] [Total: 5 marks] Sclonce/512472/2018 {Turn overPage 14 of 16 Section C [20 marks] ‘Answer any two (2) questions from this section. Write your answers in the separate Answer Booklet provided. ca Iron is extracted from its ore in a blast furnace. Coke +X +¥ = - Bi Waste gases Waste gases Hot air —>—>, <— Hotair —> Molten iron Coke and matefial&\X ahd Y are fed into the furnace. (a) Name'the materials X and Y. - 2 (b)_Whabisthe use of the waste gases? ie) (4 “(o/ Whatis the reducing agent in this extraction? i (Gi) Describe how the reducing agent is produced. (2] (d) What is the purpose of each of the following @ hot air, (1 coke. Q] (2) Show the balanced equation in which iron is extracted from the ore. rea] [Total: 10 marks] ‘Scienoe(5124/2/2019c2 c3 Page 15 of 16 Nitrogen is used to manufacture ammonia as shown in the diagram. Nitrogen eC + Catalyst | pramonia Zatm x (a) Name the process shown above. i (b) State the substance represented by letter X. i (©) Write the conditions represented-by ¥ and Z needed for the process. rea] (4) (i)__Name the catalyst used. (ii) Write the main ore from which the catalyst named in (d)(j) is extracted. [2] (@) Construct a balanced chemical equation for the reaction shown in the diagram, including state symbols. * Bl (A) State one use of ammonia. m [Total: 10 marks] Butene, CHa, is a compound belonging to the alkéne series. (a) State the general formula for the alkenes. (1) (b) Draw tlie displayed formula of the.second member of the series. i) (©) _Butene is prepared by cracking petroleum oils. Name the other method by which it may be preparedy 0} (A) But-1-ene can be polymerised. (@__ Name the-type of polymerization it undergoes. i (ii) Draw and give the name of.the polymer formed from but-1-ene. Show at least'three repeating units. . 2 (e) Butenerteacts with steam in the presence of a catalyst to form a colourless compound. (i) / Name the compound formed. ret] (ii) Write a balanced chemical equation for the reaction between ethanoic acid and the compound named in (e) (i) above. Include state symbols. 3) [Total: 10 marks} Science 1207272019 [Turn overte al ZAMBIAN ONLINE EDUCATION COMPANY mainstreaming and accelerating the use of ICT in the Zambian*education sector SERVICES*OFFERED: 1.zedpastpapers.com - download ecz past papers with solutions for free 2.eskulu:com - free e-learning: notes, quizzes and expert QnA 3. Take your school online - Learning Management System development for your school or institution 4.Career advice and guidance WHATSAPP: +260972976860 EMAIL: INFO@ESKULU.COM Ih (\,