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

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