Pre test2

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Pre test2

  1. 1. Nama:....................................................Tingkatan :..............................<br />SULIT<br />4541/1<br />Chemistry<br />2 jam 30 minit<br />CHEMISTRY DEPARTMENT<br />PRA-PEPERIKSAAN AKHIR TAHUNTINGKATAN 4 TAHUN 2011<br />CHEMISTRY <br />Dua jam tiga puluh minit<br />1ABCD16ABCDSoalanMarkah penuhMarkah 2ABCD17ABCDA1-30303ABCD18ABCDB184ABCD19ABCD2105ABCD20ABCD315C4206ABCD21ABCD5177ABCD22ABCDJumlah: [100]8ABCD23ABCD9ABCD24ABCD10ABCD25ABCD11ABCD26ABCD12ABCD27ABCD13ABCD28ABCD14ABCD29ABCD15ABCD30ABCD<br />1The following word equation shows a chemical reaction.<br />X + magnesium oxide magnesium chloride + water <br />What is acid X?<br />A Hydrochloric acidC Phosphoric acid<br />B Sulphuric acidD Nitric acid<br />2Hydrogen chloride in methylbenzene does not show any acidic property. Which of the followings explain the observation?<br />A Hydrogen choride is a covalent compound<br />B Hydrogen choride molecules ionises in the solution.<br />C This solution does not contain hydrogen ions.<br />D This solution show the electrical conductivity<br />3Which of the following reactions does not show the role of benzoic acids as an acid?<br />A The burning of benzoic acid to produce carbon dioxide and water<br />B The reaction that occurs between benzoic acid and sodium hydroxide to produce salt and water<br />C The reaction that occurs between benzoic acid and limestone to produce carbon dioxide<br />D The reaction that occurs between benzoic acid and magnesium ribbon to produce hydrogen<br />4Which of the following statements are true for both dilute ethanoic acid and dilute hydrochloric acid of the same concentration?<br />I They have different concentration of hydrogen ions.<br />II Their degree of ionisation in water is the same.<br />III They have different pH value.<br />IV They neutralise equal amount of sodium hydroxide.<br />A I and II onlyC II and IV only<br />B I and III onlyD III and IV only<br />5Which of the following is a synthetic polymer?<br />A Rubber C Protein<br />B PVCD Starch<br />6What is the type of glass used to make laboratory glass wares?<br />A Lead glass C Borosilicate glass<br />B Fused glass D Soda glass<br />7Which of the following substances used by a farmer to neutralize an acidic soil?<br />A Calcium oxideC Sodium hydroxide<br />B Sulphuric acidD Ammonium hydroxide<br />8Which of the following are insoluble salts? <br />I Silver chloride<br />II Magnesium nitrate<br />III Barium sulphate<br />IV Zinc carbonate<br />A I and III only C I, II and III only<br />B II and IV only D I, III and IV only<br />9If 150 cm3 of a 4 mol dm–3 solution Y is added to 250 cm3 of water, what is the molarity of the diluted solution?<br />A 1.50 mol dm–3C 2.80 mol dm–3<br />B 2.40 mol dm–3D 3.00 mol dm–3<br />10Which of the following shows a precipitation reaction?<br />A K2CO3 + Pb(NO3)2 2KNO3 + PbCO3<br />B 2HCl + PbO PbCl2 + H2O<br />C Na2SO4 + Mg(NO3)2 MgSO4 + 2NaNO3<br />D NaOH + K2CO3 Na2CO3 + 2KOH<br />11The pie chart in Diagram 11 shows the composition of stainless steel.<br />107378595885<br />Diagram 11<br />What is element X?<br />A Tin C Iron<br />B CopperD Aluminium<br />12Which of the following statement describes the property of hydrochloric acid?<br />A It reacts with any metal to give hydrogen<br />B It liberates ammonia from ammonium salts<br />C It causes colour of litmus paper to change from red to blue<br />D It reacts with any bases to produce a salt.<br />13Table 1 shows some of the steps for preparing a standard solution but they are not in order.<br /> P -Dissolve the solute in distilled waterS -Transfer the solution into a volumetric flaskQ -Add distilled water until the mark of the flaskR -Weigh the mass of the solute needed<br />Table 3<br />Which of the following sequence of steps is correct?<br />A P Q R SC R P Q S<br />B R P S QD R Q P S<br />14Diagram 10 shows the industrial preparation of sulphuric acid through the Process I. <br /> I II III IV<br /> S SO2 SO3 H2S2O7 H2SO4 <br /> oxygen oxygen concentrated H2SO4 water<br /> <br />Diagram 10<br />Which stage involves the use of a catalyst?<br />A I<br />B II<br />C III<br />D IV<br />15Diagram 6 shows the pH values of four different solutions.<br />WVYX<br /> <br />pH = 12pH = 8pH = 4pH = 1<br />Diagram 13<br />Which of the solutions has the highest concentration of hydrogen ions? <br />V<br />W <br />X <br />Y<br />16Which pairs of substances are suitable to prepare copper(II) sulphate in the laboratory?<br />I Copper and dilute suphuric acid<br />II Copper(II) carbonate and dilute sulphuric acid<br />III Aqueous copper(II) nitrate solution and dilute sulphuric acid<br />IV Copper(II) hydroxide and sulphuric acid<br />A I and II onlyC II and IV only<br />B I and III onlyD I, II and III only<br />17Lead (II) Iodide can be prepared through<br />A Precipitation Reaction<br />B Neutralization Reaction<br />C Crystallization<br />D Recrystallization<br />244072218739118Diagram 15 shows the set–up of apparatus for the titration of potassium hydroxide solution with sulphuric acid.<br />Sulphuric acid 1.0 mol dm-3<br />25 cm3 of potassium hydroxide solution 1.0 mol dm-3 and phenolphthalein as an indicator<br />Diagram 15<br />What is the volume of sulphuric acid at the end point of the titration?<br />A 12.5 cm3C 50 cm3<br />B 25 cm3D 100 cm3<br />19Sulphuric acid is a diprotic acid because<br />A sulphuric acid has the properties of acid and also a dehydrating agent.<br />B one mole of sulphuric acid can neutralise two moles of bases.<br />C one molecule of sulphuric acid contains two moles OH- ions.<br />D one molecule of sulphuric acid produces two H+ ions in water.<br />20Process II can be represented by the following equation:<br />N2 (g) + 3H2 (g) -> 2NH3 (g)<br />What is the catalyst, temperature and pressure used in this process?<br />CatalystTemperature(˚C)Pressure (atm)AIron450200BPlatinum900150CPlatinum80010DIron2001050<br />21 Table 2 shows the pairs of polymer and monomer.<br />PolymerMonomerICarbohydrateGlucoseIIPolyvinyl chlorideChloroetheneIIIProteinAmino acidIVNatural rubberNeoprene<br />Table 2<br />Which of the following pairs of polymer and monomer are correct ?<br />A I and II onlyC II, III and IV only<br />B I, II and III onlyD I, II, III and IV<br />22Neutralization reaction between nitric acid and calcium hydroxide is shown in the chemical equation below.<br />2HNO3 +Ca(OH)2 -> Ca(NO3)2 + 2H2O<br />What is the minimum volume of nitric acid of 0.2 mol dm-3 needed to completely neutralise 50 cm3 calcium hydroxide solution 0.05 mol dm-3.<br />A 12.5 cm3<br />B 25.0 cm3<br />C 37.5 cm3<br />D 50.0 cm3<br />23When sodium hydroxide is added dropwise until in excess to a solution, a white precipitate which is soluble in excess is formed. The ions that could be present in the solution are<br />I Al3+<br />II Zn2+<br />III Mg2+<br />IV Pb2+<br />A I and II only<br />B III and IV only<br />C I, II, and IV only<br />D I, II, III and IV<br />24A green solid is heated up strongly and the residue is black in colour. The solid is<br />A Sodium carbonate<br />B Lead(II) nitrate<br />C Iron(II) carbonate<br />D Copper(II) carbonate<br />25The table below shows the results of qualitative analysis of a salt.<br />Qualitative analysisObservationSodium hydroxide solution added until excess into salt solutionWhite precipitate formed and dissolve in excess.2 cm3 of dilute nitric acid is added and followed by 2 cm3 silver nitrate solution.White precipitate is formed.<br />Among the following ions, which may be present in the salt?<br />A Zn2+ and Cl-<br />B Mg2+ and Cl-<br />C Zn2+ and SO42-<br />D Mg2+ and SO42-<br />26The table below shows the observation of the reaction between calcium carbonate and ethanoic acid in two different solvents.<br />BeakerReactionObservationX calcium carbonate + ethanoic acid in distilled water.Effervescence occursYcalcium carbonate + ethanoic acid in benzeneNo visible change<br />Which of the following statements are true about the observation in beaker X and beaker Y?<br />IWater ionizes ethanoic acid in beaker X<br />IIBenzene ionizes ethanoic acid in beaker<br />IIIWater reacts with calcium carbonate in beaker X.<br />IVEthanoic acid remains as molecule in beaker Y.<br />A I and II only<br />B I and IV only<br />C II and III only<br />D III and IV only<br />27The body of the car shown in the diagram below is made of alloy T.<br />Alloy T<br />What is alloy T?<br />ASteel<br />BBrass<br />CBronze<br />DDuralumin<br />28Ammonium nitrate fertilizer is obtained through the reaction between ammonia solutions with<br />A sodium nitrate solution <br />B nitrogen dioxide gas <br />C dilute sulphuric acid <br />D dilute nitric acid<br />29Ammonium sulphate, (NH4)2SO4 is an example of a fertilizer. Calculate the percentage of nitrogen in 1 mole of ammonium sulphate.<br />[Relative atomic mass: N=14, H=1, S=,32, O=16]<br />A12.12 %B21.21 %C23.23 %D31.31 %<br />30Which salt solution is colourless?<br />A Iron(III) sulphateC Copper(II) chloride<br />B Aluminium nitrate D Potassium dichromate(VI)<br /><ul><li>Dilute hydrochloric acid0.1 moldm-3Blue litmus paperBlue litmus paperBlue litmus paperDry glacial ethanoic acidAqueous solution of ethanoic acid 0.1 moldm-3Diagram 4 shows three test tubes contain dry glacial ethanoic acid, aqueous solution of ethanoic acid and dilute hydrochloric acid.</li></ul> <br /> P Q R Diagram 4<br />(a) (i)State the colour change of the litmus paper in test tubes R.<br />...................................................................................................................................... [1 mark]<br /> (ii)Write the formula of ion which caused the colour change of the litmus paper.<br />.......................................................................................................................................[1 mark]<br />(b)Is there any changes of colour of the litmus paper in test tube P? Explain why. ..................................................................................................................................... .....................................................................................................................................[2 marks]<br />(c)Table 4 shows the pH value of aqueous solution of ethanoic acid and dilute hydrochloric acid of the same molarity.<br />Type of acidaqueous solution of ethanoic aciddilute hydrochloric acidMolarity0.1 moldm-30.1 moldm-3pH value2.91.0<br /> Table 4<br />Explain the difference in the pH value of aqueous solution of ethanoic acid and dilute hydrochloric acid.<br />............................................................................................................................................................................................................................................................................................................................................................................................................[3 marks]<br />Calcium carbonate powder is added into test tube R.<br /><ul><li>State one observation in test tube R.</li></ul> ..................................................................................................................................[1 mark]<br />2(a)Diagram 2 shows an industrial preparation of Ammonium sulphate from the product(s) of Process I and Process II.<br />Sulphuric acidProcess I<br />Reaction YAmmonium sulphate<br />Compound XProcess II<br />Diagram 2<br />State the names of compound X.<br />………………………………………………………………………………….………[1 mark]<br />State the name of Process I and Process II.<br />Process I: ………………..…………Process II: ………….…………………..…...[1 mark] <br />(iii)State the reaction Y:<br />…………………………………………………………………………………….….. [1 mark]<br />(iii)Write the balanced chemical equation for reaction Y to produce ammonium sulphate.<br />…………………………………………………………………………………………..[2 marks]<br />(b)Qualitative analysis can be used to determine the presence of cations and anions in solutions. <br />(i) Describe chemical tests that can be used to verify the sulphate ion, SO42- .<br />………………………………………………………………………………………...<br />…………………………………………………………………………………………<br />………………………………………………………………………………………… [3 marks]<br />(ii)In table 3, state the observation made when confirmatory test is carried out for ammonium ion, NH4+.<br />Confirmatory TestObservationAdded small amount of sodium hydroxide solutions to ammonium ion, NH4+ solution.Followed by heat the mixture of sodium hydroxide solutions and ammonium ion, NH4+ solution.<br />[2 marks]<br />3.An experiment is carried out to determine the concentration of nitric acid. 25 cm3 0.10 mol dm-3 potassium hydroxide solution is titrated with nitric acid from a burette. Phenolphthalein is used as an indicator. Figure 1 shows the initial and final readings of the three titrations carried out.<br />(a)Record the readings for each titration in the spaces provided in Figure 1.<br />[3 marks]<br />(b)A change in the colour of phenolphthalein indicator is observed at the end point.<br />(i)State the colour change.<br />…………………………………………………………………………………………….<br />[3 marks]<br />(ii)State the operational definition for end point in this titration.<br />…………………………………………………………………………………………….<br />[3 marks]<br />(c)Construct a table to show all the data in each of these titrations.<br />[3 marks]<br />(d)Calculate the concentration of nitric acid that is used in this experiment.<br />[3 marks]<br />+ Dilute sulphuric acidHeatedSubstance QSolid U + Gas RSolid U is blackSolution V + Gas RSolution ZSolution W + Solid X+ Dilute nitric acid+ Metal M4The flow chart in the diagram shows a series of chemical changes of solid Q .<br />Draw a labelled diagram of the set-up of apparatus for the chemical reaction of converting substance Q to solid U and gas R. In your diagram show how gas R is tested.<br />[4 marks]<br />(b)Solution Z and V are the products from reaction in flow chart.<br />(i)Name the possible metal cation in solution Z<br />(ii)Describe the confirmatory test for a cation mention in b(i)<br />[3 marks]<br />(c)Describe how to obtain crystal salt V from their solution V<br />[4 marks]<br />(d)Metal M is more electropositive than the metal in solution V. When metal M is added into solution V , chemical reaction occured. Name the metal M and give an observations for the reaction that produces solution W and solid X.<br />[2 marks]<br />The chemicals supplied are <br />Zinc oxide<br />Sodium carbonate solution <br />Dilute nitric acid<br />Describe briefly how you can prepare a sample of dry zinc carbonate in the laboratory. Include in your answer all chemical equations involved.<br />[7 marks]<br />5. Diagram 3 shows two beakers containing colourless solution labelled A and B. <br />Beaker ABeaker B<br />Diagram 3<br />You are told that the two colourless solutions are calcium nitrate and magnesium nitrate. You are required to label correctly the name of each solution in the containers. <br />Design an experiment to identify which is calcium nitrate and which is magnesium nitrate solution by using aqueous of ammonia solution as a reagent. <br />Your answer should include the following:<br />Problem statement<br />Hypothesis<br />All variables<br />List of materials and apparatus<br />Procedure<br />Tabulation of data <br />[17 marks]<br />END OF QUESTION PAPER<br />

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