RVHS_H2_CHEM_P1_ANS Prelim

River Valley High School Pg 1 of 16 [Turn over Prelim Examination 2011 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 22 September 2011 1 hour Additional Materials: Multiple Choice Answer Sheet Data Booklet READ THESE INSTRUCTIONS FIRST Write in soft pencil. 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. ________________________________________________________________________ This document consists of 16 printed pages.

River Valley High School Pg 2 of 16 [Turn over Prelim Examination 2011 Year 6 H2 Chemistry 9647 Paper 1 Section A For each question there are four possible answers, A, B, C and D. Choose the one you consider to be correct. 1. Complete combustion of a sample of a hydrocarbon, Y, gave 0.66 g of carbon dioxide and 0.36 g of water. The empirical formula of Y is A C3H4 B C3H5 C C3H8 D C6H8       2. 10 cm 3 of 0.2 mol dm-3 K2XO4 will react with 40 cm 3 of 0.1 mol dm-3 iron (II) sulfate solution. If Fe2+ is oxidised to Fe3+ by K2XO4, what is the final oxidation state of X? A +2 B +3 C +4 D +5 3. Which one of the following ions has the most number of unpaired electrons? A Cr3+ B Ni2+ C Ca2+ D Co3+ 4. Which of the following species contains the smallest bond angle? A N 2H4 B BrF5 C XeF2 D SO2 5. Which of the following graphs shows the correct relationship between the density of a gas ( ) against temperature (T) for an ideal gas under constant pressure? A B C D  T / K  T / K  T / K  T / K

River Valley High School Pg 3 of 16 [Turn over Prelim Examination 2011 Year 6 H2 Chemistry 9647 Paper 1 6. Given the information: ∆Hc(C) = 394 kJ mol1 ∆Hf(H2O) = 286 kJ mol1 ∆Hf(CH3OH) = 239 kJ mol1 Which one of the following is the correct enthalpy change of combustion of methanol, CH3OH, in kJ mol1? A 441 B 727 C 919 D 1205     7. For which equilibrium does Kc have no units? A C(s) + H2O(g) ⇌ CO(g) + H2(g) B CH3OH(l) + CH3CO2H(l) ⇌ CH3CO2CH3(l) + H2O(l) C [Cu(H2O)6]2+(aq) + 4NH3(aq) ⇌ [Cu(NH3)4(H2O)2]2+(aq) + 4H2O(l) D N2O4(g) ⇌ 2NO2(g)     8. A substance P changes to form the product Q, according to the equation k1 = r