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CATHOLIC HIGH SCHOOL2009 PRELIMINARY EXAMINATION IIISubject : CHEMISTRY Paper : 1Code : 5072/01 Date : 23 SEP 2009 (Wed)Marks : 40 Duration : 1 hourName : ____________________________________ ( )Class: Sec 4 - ____INSTRUCTIONS:Do not open this booklet until you are told to do so.Write your name, class and registration number on the answer sheet(OAS).There are forty questions in this paper. Answer all questions. For eachquestion, there are four possible answers, A, B, C and D. Choose theone that you consider correct and record your choice in soft pencil on theOAS.Read the instructions on the OAS very carefully.INFORMATION FOR THE CANDIDATES:Each correct answer will score one mark.A mark will not be deducted for a wrong answer.Any rough working should be done in this booklet.A copy of the periodic table is printed on the last page.This question paper consists of 17 printed pages, including this cover page.Catholic High School Preliminary Examination III Paper 1

1 Which of the following is likely to be a pure compound?A A blue solutionB Colourless crystals which melts at 58 o C.C Blue crystals which melt over a range (55-60) o CD An oily liquid give two fractions when distilled.2 The diagram below shows the fractional distillation of two liquids R and S. R hasa boiling point of 80 o C and S has a boiling point of 110 o C.Which statements about the experiment are correct?1 The vapour at point X contains more R than S.2 The liquid left in the flask contains more S than R.3 The temperature at point X is higher than the temperature at point Y.ABCD1, 2 and 3 correct1 and 2 correct2 and 3 correct1 onlyCatholic High School Preliminary Examination III Paper 1

3 It was suspected that an illegal drug Y contained one or more of three poisonouscompounds P, Q or R. Spots of each poisonous compound were put on thestarting line of two chromatograms. The first chromatogram was developed withmethylated spirit, and the second with water. The results are shown below.From these chromatograms, we can deduce that Y containsABCDP only.Q only.R only.R and Q only.4 The apparatus below is used to show the diffusion of gases.Which pair of gases X and Y would cause no movement of the water?Gas XGas YA carbon monoxide nitrogen dioxideB nitrogen etheneC carbon dioxide ethaneD ethene nitrogen monoxideCatholic High School Preliminary Examination III Paper 1

5 The diagrams below represent the arrangement of particles. Which onerepresents a sugar solution?6 Two particles C and D have the composition shown in the table.particlenumber ofelectronsnumber ofneutronsnumber ofprotonsC 18 16 15D 18 16 16The particles C and D areABCDisotopes.metal atoms.positive ions.negative ions.Catholic High School Preliminary Examination III Paper 1

7 The table gives information about the ability of four substances to conductelectricity.SubstancePQRSConduction of electricitydoes not conduct under any conditionsconducts only in aqueous solutionconducts when molten and when solidconducts when molten and when in aqueoussolutionWhat could be the four substances be?P Q R SA Pb HCl NaCl SB S HCl NaCl PbC S HCl Pb NaClD S NaCl HCl Pb8 The atoms of two elements P and Q have the structures shown below.Pee3p4neQeeee8p8neeeeWhen these two elements combined to form a compound, what is the massnumber of one mole of this compound?A 11B 12C 23D 30Catholic High School Preliminary Examination III Paper 1

9 Which of the following best explains why graphite and copper can conductelectricity in the solid state?ABCDBoth graphite and copper contain free electrons.Both graphite and copper contain mobile ions.Graphite contains free electrons while copper contains free electrons andmobile ions.Graphite and copper each contain both free electrons and mobile ions.10 The bonding in sulfuric acid can be represented by the structure shown below.What is the total number of electrons in the covalent bonds surrounding thesulphur atom?A 4 B 6 C 8 D 1211 The word equation shows a chemical reaction.Solution Z + ammonium chloride ----> a salt + water + ammoniaWhat could solution Z be?ABCDhydrochloric acidnitric acidpotassium hydroxidepotassium nitrate12 A mixture of white solids is treated with an excess of dilute hydrochloric acid.A colourless gas is evolved and some, but not all, of the mixture dissolves.What could the mixture contain?A Ba(NO 3 ) 2 and Ca(OH) 2BBaSO 4 and CaOC CaCO 3 and BaSO 4D Ca(OH) 2 and MgCO 3Catholic High School Preliminary Examination III Paper 1

13 Which of the following oxides can react with sodium hydroxide solution?ABCDmagnesium oxidezinc oxidecalcium oxidecopper (II) oxide14 Which of the following statements concerning the formation of chloride ionsfrom chlorine atoms is correct ?A The number of shells occupied by electrons in a chlorine atom equals thatin a chloride ion.B The atomic number of chlorine increases by 1.C The mass number of chlorine increases by 1.D The change is an oxidation.15 In an experiment, 8.0 cm 3 of 1.0 mol/dm 3 copper(II) sulfate solution was mixedwith 4.0 cm 3 of 1.0 mol/dm 3 sodium carbonate solution.What does the reaction vessel contain at the end of the experiment?ABCDa green precipitate and a blue solutiona colourless solution onlya white precipitate and a colourless solutiona green precipitate and a colourless solution16 An oxide of element X has the formula X 2 O 3 . 10.2 g of this oxide contains5.4 g of X. How many atoms are there in 5.4 g of X?A 36.0B 27.0C 1.2 x 10 23D 3.0 x 10 24Catholic High School Preliminary Examination III Paper 1

17 Consider the reaction:4H 2 (g) + Fe 3 O 4 (s) 3Fe(s) + 4H 2 O(l)What mass of iron would be obtained if 96.0 cm 3 of hydrogen, measured atroom temperature and pressure, is consumed in the reaction ?ABCD0.056 g0.084 g0.168 g0.224 g18 Which of the following pairs of solutions, when mixed, would be suitable forpreparing an insoluble salt?ABCDlead(II) nitrate and sodium chloridecopper(II) sulphate and sodium nitratezinc chloride and potassium nitrateiron(II) sulphate and acidified potassium dichromate (VI)19 The bar chart shows the period of elements from lithium to neon.PropertyLi Be B C N O F NeWhich property of these elements is shown on the chart?ABCDthe number of electrons used in bondingthe number of electron shellsthe proton numberthe relative atomic mass20 Carbon and silicon are in the same Group of the Periodic Table. What is theformula of ammonium silicate?A NH 3 SiO 2 B NH 4 SiO 3 C (NH 4 ) 2 SiO 3 D (NH 3 ) 2 SiO 3Catholic High School Preliminary Examination III Paper 1

21 Which statement about the extraction of iron in the blast furnace is correct?ABCDMolten iron floats on top of molten slag at the bottom of the furnaceCarbon dioxide is a product when iron oxide is reduced to ironIron oxide is reduced by carbon dioxideCoke is added to the furnace to remove impurities22 When a piece of copper is dropped into an aqueous solution of compound X,the copper gradually dissolves. X is probablyABCDdilute hydrochloric acid.lead(II) nitrate.silver nitrate.ammonium chloride.23 Which of the following statements concerning the Haber process isincorrect?ABCDNitrogen and hydrogen undergo complete reaction in thereaction chamber.Nitrogen and hydrogen are compressed to about 250 atmbefore they are allowed to undergo reaction.The process is operated at about 450°C.The catalyst used is iron.24 In which of the following will a redox reaction occur?ABCDAdding sodium chloride solution to aqueous silver nitrateAdding dilute sulfuric acid to aqueous sodium hydroxideAdding aqueous ammonia to aqueous zinc nitrateAdding magnesium to aqueous copper (II) chloride25 The symbol of vanadium is V. What is the oxidation number of vanadium inammonium vanadate, NH 4 VO 3 ?A +1B +3C +5D +6Catholic High School Preliminary Examination III Paper 1

26 In which of the following processes will carbon dioxide be produced?(1) the fermentation of glucose solution(2) the reaction between ethanoic acid and limestone(3) the treatment of car exhaust in a catalytic converterA (1) and (2) onlyB (1) and (3) onlyC (2) and (3) onlyD (1), (2) and (3)27 Which of the following gases is/are likely to cause global warming?(1) methane(2) carbon dioxide(3) carbon monoxideA (1) and (2) onlyB (2) onlyC (2) and (3) onlyD (1), (2) and (3)28 In which circuit does the bulb light up?NaCl (s)Catholic High School Preliminary Examination III Paper 1

29 A piece of litmus paper was soaked in concentrated sodium chloride solution andsupported on a glass slide. The paper was connected to a direct current supply asshown in the diagram below.negativeelectrodepositiveelectrodeglass slideLitmus paperWhich of the following describes the observations near the electrodes after thecurrent had flowed for some time?Positive electrodeNegative electrodeA Bleached No changeB No change BleachedC Bleached BlueD Bleached Red30 The diagram below shows a ‘lemon cell’. Which of the following statements concerningthis lemon cell is NOT correct?A Electrons flow from zinc rod to copperrod.B The light bulb will not light if the copperrod is replaced by a magnesium rod.C The electrolyte in a lemon cell is theorganic acid and mineral salts in thelemon.D The light bulb will also light if the lemonis replaced by an orange.Catholic High School Preliminary Examination III Paper 1

31 A thermometer is placed in water and the temperature is measured as shown.An exothermic change takes place as a solid is dissolved in the water. Thetemperature changes by 4.5 °C. What is the final temperature?A 38.0 °C B 38.5 °C C 47.0 °C D 47.5 °C32 In which reaction is the pressure least likely to affect the rate of the reaction?A C(s) + CO 2 (g) 2CO(g)B 2SO 2 (g) + O 2 (g)C N 2 (g) + 3H 2 (g)D NaOH(aq) + HCl(aq)2SO 3 (g)2NH 3 (g)NaCl(aq) + H 2 O(l)33 The diagram shows the fractional distillation of crude oil.Fraction XCrude oilFraction YWhich of the statements about fractions X and Y are correct?X is more flammable than Y X has a higher boiling point than YA Yes YesB Yes NoC No YesD No NoCatholic High School Preliminary Examination III Paper 1

34 An unsaturated acid has a formula C 8 H 11 COOH. What is the maximum number ofcarbon-carbon double bonds present in one molecule of the acid?A 1 B 3 C 6 D 1235 One of the equations for the reaction between a hydrocarbon C y H 6 and brominecan be represented as follows:C y H 6 + 2Br 2 C y H 4 Br 2 + 2HBrWhich of the following is a correct statement?A It is an addition reaction.B UV light is an essential condition for the reaction to take place.C The molecular formula of the hydrocarbon is C 3 H 6 .D High temperature, high pressure and a catalyst are required in thereaction.36 A 10 cm 3 sample of a gaseous hydrocarbon is completely burnt in oxygen.The total volume of the products is 40 cm 3 . Which equation represents thecombustion of the hydrocarbon?ABCDCH 4 (g) +2O 2 (g) CO 2 (g) + 2H 2 O (g)C 2 H 4 (g) + 3O 2 (g) 2CO 2 (g) + 2H 2 O (g)C 3 H 8 (g) + 5O 2 (g) 3CO 2 (g) + 4H 2 O (g)2C 2 H 6 (g) +7O 2 (g) 4CO 2 (g) + 6H 2 O (g)37 The second member of a homologous series has the formula C 7 H 8 . What is theformula of the first member?A C 6 H 6B C 6 H 8C C 6 H 7D C 7 H 6Catholic High School Preliminary Examination III Paper 1

38 The results of tests on compound X are shown.Testadd bromine wateradd aqueous sodium carbonateResultturns colourlesscarbon dioxide formedWhat is compound X?39 Which of the following shows the structure of Terylene?OHHOACNNCnOOBCOOOCOnCCCOOOnDOCnCatholic High School Preliminary Examination III Paper 1

40 CH 3 H CH 3 H CH 3C C C C CCH 3 CH 3 CH 3 CH 3 CH 3The monomer for the above polymer isA CH 3 – CH = CH 2B CH 3 – CH 2 – CH = CH 2C CH 3 – CH = CH – CH 3D CH 3 – CH = C – CH 3CH 3- End of Paper 1 -Catholic High School Preliminary Examination III Paper 1

DATA SHEETColours of some common metal hydroxidesAluminium hydroxideCalcium hydroxideCopper (II) hydroxideIron (II) hydroxideIron (III) hydroxideLead (II) hydroxideZinc hydroxideWhiteWhiteLight blueGreenRed-brownWhiteWhiteCatholic High School Preliminary Examination III Paper 1

Catholic High School Preliminary Examination III Paper 1