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 = rate constant of the forward reaction k1 = rate constant of the backward reaction Both the forward and backward reactions are first order. Which of the following expression represents the equilibrium constant, Kc? A k1 B k1[P] C k k 1 1 D k k 1 1 [P] [Q]

River Valley High School Pg 4 of 16 [Turn over Prelim Examination 2011 Year 6 H2 Chemistry 9647 Paper 1 9. Four reactions of the type shown are studied at the same temperature. X (g) + Y (g) ⇌ Z (g) Which is the correct reaction pathway diagram for the reaction that would proceed most rapidly and with good yield? A B C D     10. The solubility of barium hydroxide in water is least affected by the addition of A BaSO4 B Br2 C NH3 D CH3COCl

River Valley High School Pg 5 of 16 [Turn over Prelim Examination 2011 Year 6 H2 Chemistry 9647 Paper 1 11. A direct current is passed through the apparatus shown in the diagram below. What are the colours at positions X, Y and Z? X Y Z A red purple blue B blue purple red C white purple blue D blue purple white 12. The use of Data Booklet is relevant to this question. In many areas, tap water becomes slightly acidic due to dissolved carbon dioxide. By considering the relevant E  values, which of the following metals will not be dissolved by tap water containing carbon dioxide? A chromium B copper C iron D lead     13. Which of the following elements is expected to show the greatest tendency to form covalent compounds? A barium B calcium C magnesium D potassium +  X Y Z carbon electrodes neutral litmus paper soaked in concentrated potassium chloride

River Valley High School Pg 6 of 16 [Turn over Prelim Examination 2011 Year 6 H2 Chemistry 9647 Paper 1 14. Element Y is in Period 3. It forms an acidic oxide which is insoluble in water and a chloride which is readily hydrolysed by water. Which group in the Periodic Table might contain Y? A II B III C IV D V 15. Which of the following statements about Group VII compounds is correct? A The reducing power of the hydrogen halides increases down the group. B The thermal stability of the hydrogen halides increases down the group. C The solubility of the silver halides increases down the group. D The magnitude of the lattice energy of the silver halides increases down the group. 16. Which of the following transition elements can show the highest oxidation number in its compounds? A chromium B copper C iron D manganese 17. A compound X was dissolved in water and then aqueous sodium hydroxide was added until present in excess. A white precipitate was formed, which turned brown on standing. A MgSO4 B MnSO4 C FeSO4 D Fe2(SO4)3

River Valley High School Pg 7 of 16 [Turn over Prelim Examination 2011 Year 6 H2 Chemistry 9647 Paper 1 18. Which of the following options about the structure (as shown below) is correct? CH2CN O Cl No of sp hybridised C No of sp2 hybridised C No of sp3 hybridised C A 1 3 6 B 1 3 8 C 0 4 6 D 0 4 8 19. The drug cortisone has the formula shown. O CH3 O CH3 C OH O CH2OH cortisone How many chiral centres are present in the cortisone molecule? A 3 B 4 C 5 D 6 20. Which hydrocarbon can form a monochloro-substituted derivative which shows both optical and cis-trans isomerism? A CH3CH=CH2 B (CH3)2C=CH2 C CH3CH=C(CH3)2 D CH3CH=CHCH2CH3

River Valley High School Pg 8 of 16 [Turn over Prelim Examination 2011 Year 6 H2 Chemistry 9647 Paper 1 21. Myrcene is a chemical produced by pine trees in North America, which attracts females of the beetle Dendroctonus brevicomins . This will indirectly cause the death of the tree. To prevent this, Myrcene can be converted to its isomer, Y, via intermediate X. C CH2 CH2 CH CH2 CH CH2 C CH3 CH3 C CH2 CH2 CH2 CH3 C H CH3 C CH3 CH3 Br Br Br C CH CH2 CH CH2 CH CH3 C CH3 CH3 Myrcene X Y Which of the following statements is true? A Myrcene reacts with 1.5 moles of bromine to form intermediate X. B Myrcene can be distinguished from its isomer Y by reaction with hot, acidified KMnO 4. C Intermediate X reacts with ethanolic sodium hydroxide to form isomer Y. D X is formed from Myrcene via hydrogenation. 22. Which of the following is the least likely product formed in the termination step in the reaction of CH3CH3 with Cl2 in the presence of UV light? A HCl B CH3CH2Cl C CH3CH2Cl2 D C4H10 23. Geraniol is found in rose oil and is used for the preparation of artificial scents. Upon controlled oxidation, geraniol yields CH 3COCH3, CH3COCH2CH2COOH and H 2C2O4. H2C2O4 neutralises completely 2 moles equivalent of NaOH in an acid-base reaction, and can also be oxidised under vigorous conditions to CO 2 and H 2O. A possible structure of geraniol is: A CH 3CH=C(CH3)CH2CH2C(CH3)=CHCH2OH B (CH3)2C=CHCH2CH2C(CH3)=CHCH2OH C (CH3)2C=C(CH3)CH2C(CH3)=CHCH2OH D (CH3)2C=