RVHS H2 Chem 2013 Prelim P1 QP & Soln

1 River Valley High School 9647/01/PRELIM/13 [Turn over Prelim Examination 2013 Year 6 H2 Chemistry 9647 Paper 1 RIVER VALLEY HIGH SCHOOL YEAR 6 PRELIMINARY EXAMINATION CANDIDATE NAME CLASS 6 CENTRE NUMBER S INDEX NUMBER H2 CHEMISTRY 9647/01 Paper 1 Multiple Choice 26 September 2013 1 hour Additional Materials: Mult iple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class, centre number and index number on the Answer Sheet in the spaces provided. 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. ________________________________________________________________________ 1034

2 River Valley High School 9647/01/PRELIM/13 [Turn over Prelim Examination 2013 Year 6 H2 Chemistry 9647 Paper 1 This document consists of 20 printed pages. Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1. In an attempt to establish the formula of an oxide of nitrogen, a known volume of the pure N xOy gas was mixed with hydrogen and passed over a catalyst at a suitable temperature. 100% conversion of the oxide to ammonia and water was known to have taken place. 2400 cm 3 of nitrogen oxide measured at room temperature and pressure produced 7.20 g of water. The ammoni a produced was neutralised by 200 cm 3 of 1.0 mol dm–3 of HCl. What is the formula of the nitrogen oxide? A N2O B N2O2 C N2O4 D NO2 2. In an experiment, 50.0 cm 3 of a 0.100 mol dm −3 solution of a metallic ion, M n+, reacted exactly with 25.0 cm3 of 0.100 mol dm−3 aqueous sodium sulfite. The half-equation for the oxidation of sulfite ion is shown below. SO3 2− (aq) + H2O (l)  SO4 2− (aq) + 2H+ (aq) + 2e− If the final oxidation number of the metal in the salt was +3, what would be the original oxidation number of the metal? A +1 B +2 C +4 D +5 3. Titanium has the electronic structure, 1s 2 2s2 2p6 3s2 3p6 3d2 4s2. Which one of the following compounds is unlikely to exist? A TiO B TiC l3 C K3TiF6 D K2TiO4 1035

3 River Valley High School 9647/01/PRELIM/13 [Turn over Prelim Examination 2013 Year 6 H2 Chemistry 9647 Paper 1 4. Hydrazine, N2H4, and hydrogen peroxide, H 2O2, are both used as rocket propellants because they can produce large volumes of hot gases from a small volume of liquid. Which of the following statements about these two compounds is correct? A The bond angle in N2H4 is smaller than that in H2O2. B The boiling point of N2H4 is lower than that of H2O2. C The N─H bond is shorter than the O─H bond. D N2H4 is a weaker base than H2O2. 5. The graph below shows the variation in the values of PV/RT with pressure for 1 mol of Gas J and 1 mol of Gas K. Which of the following is true of the identity of Gas J and Gas K? Gas J Gas K A Neon at 498 K Neon at 298 K B Hydrogen gas at 298 K Car bon dioxide at 298 K C Neon gas at 498K Carbon dioxide at 498 K D Nitrogen gas at 298K Nitrogen gas at 498K PV RT P / atm Gas K Gas J 1.0 1036

4 River Valley High School 9647/01/PRELIM/13 [Turn over Prelim Examination 2013 Year 6 H2 Chemistry 9647 Paper 1 6. Use of Data Booklet is relevant in this question. Aluminium oxide is a stable ionic compound. Al (s)  Al3+ (g) + 3e– ∆ H = +5467 kJ mol–1 ½ O2 (g) + 2e  O2– (g) ∆H = +897 kJ mol–1 Which of the following statements is false? A The enthalpy change of atomisation of aluminium is +330 kJ mol–1. B The enthalpy change of formation of aluminium oxide is –13625 kJ mol–1 C The lattice energy of aluminium oxide is more exothermic than the enthalpy change of formation of aluminium oxide. D The sum of the first and second electron affinities of oxygen is +649 kJ mol–1. 7. Uranium 235 is an isotope of uranium. It is unstable and undergoes radioactive decay to form barium and other elements. Th is radioactive deca y is a first-order reaction with a half life of 7.04  108 years. A barium free rock sample was found to contain some Uranium 235. Calculate the molar proportion of uranium to barium 235 after a period of 2.11  109 years. A 1:1 B 1:3 C 1:5 D 1:7 1037

River Valley H Prelim Examin 9. Use Wh pre A B C D 8. The Sug A B C D igh School nation 2013 e of Data B hich of the ssure? Mixing a Adding c Mixing a Adding peroxide e following ggest appr Electro Coppe Graphi Iron Iron Booklet is r following w aqueous ch copper me aqueous so a aqueo u e is a diagra ropriate ma Half ode er 1 m te 1 m 1 m 1 m 1 m 1 m 9647 relevant in will not pro hlorine with etal into con odium chlo us iron( III) am set up aterial to m cell X Electroly ol dm3 Cu mol dm3 Fe mol dm3 Fe mol dm3 Fe mol dm3 Fe mol dm3 Fe 5 7/01/PRELIM/1 this quest oduce a ga h mangane ncentrated oride with a ) chloride to investig make the ha yte uSO4(aq) eCl2(aq) eCl3 (aq) eCl2(aq) eCl3(aq) eCl2(aq) 3 tion. aseous pro ese(III) chl d nitric acid acidified po into a s o ate standa alf cell X a Electro Iron Coppe Graphi Graphi Year 6 H oduct at roo loride d solution otassium m olution of ard cell pot nd Y. Half ode 1 m 1 m er 1 m ite 1 m 1 m ite 1 m [Tu H2 Chemistry 96 om temper manganate acidified tential (E⦵ cell Y Electro mol dm3 KM mol dm3 H mol dm3 C mol dm3 KM mol dm3 H mol dm3 C urn over 647 Paper 1 rature and (VII) hydrogen cell) lyte MnO4(aq) HNO3(aq) uSO4(aq) MnO4(aq) HNO3(aq) uSO4(aq) 1038

River Valley H Prelim Examin 10. The One diox SO pre co n Wh A C 11 Whe simil pH At w igh School nation 2013 e contact p e of the s xide to pro 2(g) and O ssure of 5 nsumed. hat is the nu 0.0566 1.75 en 25 cm3 lar concen which point process is teps of th e oduce sulfu O2(g) were 5 atm. At e umerical v of aqueou tration, Th will the mi 9647 an importa e process ur trioxide g 2SO2 mixed in a equilibrium alue of Kp s hydrochl e following xture have 6 7/01/PRELIM/1 ant industri involves t gas in an e 2(g) + O2(g a 1:2 ratio m, it was f o of this rea B D loric acid i g pH curve e maximum 3 ial reaction the additi o equilibrium ) ⇌ 2SO3(g and the m ound that 3 action? 0.142 8.35 s titrated a e is obtaine Volum m buffering Year 6 H n which pro on of exc e reaction: g) mixture wa 30% of th e against aqu ed: e of ethyla capacity? [Tu H2 Chemistry 96 oduces su ess oxyge n s kept at a e sulfur di o ueous ethy amine/cm3 ? urn over 647 Paper 1 lfuric acid. n to sulfur a constant oxide was ylamine of f 1039

7 River Valley High School 9647/01/PRELIM/13 [Turn over Prelim Examination 2013 Year 6 H2 Chemistry 9647 Paper 1 13. Two solutions were prepared by dissolving a chloride and an oxide of elements in the third period of the Periodic Table in separate portions of water. Both solutions prepared can be used to dissolve A l2O3 but only one can be used to dissolve SiO2. Which of the following could be the chloride and the oxide used? A PCl5 and Na2O B NaCl and SO3 C MgCl2 and MgO D SiCl4 and P4O10 14. X, Y and Z are consecutive elements in Period 3 of the Periodic Table. Y has the highest first ionisation energy and the lowest melting point among the three elements. Which of the following could be X, Y and Z? A sodium, magnesium, aluminium B magnesium, aluminium, silicon C aluminium, silicon, phosphorus D silicon, phosphorus, sulfur 12. When magnesium carbonate powder is ad de