YJC H2 CHEM P1

This question paper consists of 15 printed pages. YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE YISHUN JUNIOR COLLEGE CANDIDATE’S NAME: ______________________________ CTG: _________ YISHUN JUNIOR COLLEGE PRELIMINARY EXAMINATION 2009 CHEMISTRY 9746/01 HIGHER 2 MONDAY 31 AUGUST 2009 0800hrs − 0900hrs (1 hour) Additional materials: Multiple Choice Answer Sheet and Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil Do not use paper clips, highlighters, glue or correction fluid. Write your Centre number, index number, name and CTG on the Answer Sheet. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C, and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. 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.

2 Section A For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct and shade your choice on the OMS provided. 1 What volume of CO 2 will be formed when y cm 3 of a 50:50 mixture of methane and propane is completely burnt? A 2y cm3 B 5y/2 cm3 C 4y cm3 D 5y cm3 2 Which of the following ions has the smallest ionic radius? A F − B Ne C Mg2+ D Al3+ 3 Which of the following statements describes a phenomenon which cannot be explained by hydrogen bonding? A Ice has a lower density than water at 0 C. B The boiling point of alcohols increases with increasing relative molecular mass. C 2−nitrophenol is more volatile than 4−nitrophenol. D Ethanoic acid molecules form dimers when dissolved in benzene. 4 A student used the apparatus below to determine the enthalpy change of combustion o f propan-1-ol. The following results were obtained: mass of propan-1-ol burnt = 0.60 g mass of water heated = 200 g initial temperature of water = 21.0 C Given that the enthalpy change of propan-1-ol is − 2021 kJ mol −1 and the heat capacity o f water is 4.17 J K−1 g−1, what would be the final temperature of the water? A 24.2 C B 29.1 C C 45.2 C D 48.4 C thermometer calorimeter containing 200 g of water burner containing propan-1-ol 9746 / YJC / 2009 / Preliminary Examination / Paper 1

3 5 Which treatment is frequently used to protect aluminium articles from subsequent corrosion? A Making the aluminium the anode during electrolysis. B Dipping the aluminium in hot aqueous sodium hydroxide. C Dipping the aluminium in molten cryolite. D Coating the aluminium with zinc. 6 A piece of litmus paper was soaked in saturated NaC l solution and supported on a glass slide. The paper was connected to a battery as shown in the diagram below. Which of the following gives the observations near the negative electrode and positive electrodes after the current has flowed for some time? negative electrode positive electrode A no change bleached B bleached no change C red bleached D blue bleached glass slide litmus pap er c onnected to negative electrode of battery connected to positive electrode of battery 7 The pKb value for aqueous ammonia at 25 C is 4.8. What is the pKa value for the ammonium ion at this temperature? A 2.2 B 4.8 C 9.2 D 11.8 8 The rate of reaction of a strip of magnesium and 50 cm3 of 1.0 mol dm−3 HCl is determined at 25  C. In which of the following cases would both new conditions contribute to an increase in the rate of reaction? A Mg powder and 100 cm3 of 1.0 mol dm−3 HCl B Mg powder and 50 cm3 of 0.8 mol dm−3 HCl C 100 cm3 of 1.0 mol dm−3 HCl at 30 C D 50 cm3 of 1.2 mol dm−3 HCl at 30 C 9746 / YJC / 2009 / Preliminary Examination / Paper 1

4 9 The energy diagram represents the reaction occurring with and without a catalyst. Which of the following statements is correct? A E4 is the activation energy for the reverse catalysed reaction. B The forward reaction, with catalyst, is endothermic. C The enthalpy change of reaction is (E2 − E3). D The enthalpy change of reaction is reduced by using a catalyst. 10 Which graph best shows the variation of first ionisation energy of the third period elements? A B C D 9746 / YJC / 2009 / Preliminary Examination / Paper 1

5 1 hich of the following sets contains a basic, an acidic, and an amphoteric oxide? Al 3 SiO2 P4 10 Na O MgO P 10 Na O P 10 SO3 MgO Al 3 SO3 12 that xplosion may occur. Which of the following best accounts for the above statement? nic radius increases down the group. nisation energy increases down the group. harge density increases down the group. educing power increases down the group. 13 likely to be true for astatine, the element below dine in Group VII of the Periodic Table? A 1 W A 2O O B 2 4 O C 2 4 O D 2O It may be dangerous to put Group II metals in dilute acids since there is a possibility e A Io B Io C C D R Which of the following statements is most io Astatine and aqueous potassium chloride react to form aqueous potassium astatide nd chlorine. B tide and dilute aqueous ammonia react to form a solution of a soluble omplex. odium astatide and hot concentrated sulphuric acid react to form astatine. statine is a coloured liquid at room temperature. 14 solutions. Which of the llowing reagents can be used to distinguish the two solutions? queous chlorine queous sodium chloride queous sodium thiosulphate queous iron(II) sulphate, followed by aqueous sodium hydroxide a Silver asta c C S D A Both aqueous bromine and aqueous iodine a ppear as yellow fo A A B A C A D A 9746 / YJC / 2009 / Preliminary Examination / Paper 1

6 5 hich of the following statements concerning the transition metals is correct? hey are the only metals which have more than one oxidation state. hey are the only metals which give coloured ions in an aqueous solution. hey are only metals of which the anhydrous chlorides have covalent bonds. hey are the only metals which form complex ions. 16 d in liquid nitrogen ( −196 C), the pale hich of the following statements best explains th