Session : January 2012 Programme : A Level (CAL) MOCK Examination Paper (COVER PAGE) Course : CHM 1312 : Chemistry 2 (PAPER 1) Date of Examination : April 9, 2012 (Monday) Time : 1:30 p.m. 2:30 p.m. Reading Time: Nil Duration : 1 Hours Special Instructions : Answer ALL questions. Materials permitted : Materials provided : Non-Programmable Calculator Data Booklet & OMR Sheet Examiner (s) : Ms Lim Sze Theng, Mr Subash Loganathan, Mr Liam Choon Peng, Ms Wong Suk Mei Moderator : Mr Subramaniam Panchacharam This paper consists of 12 printed pages, including the cover page.
CHM 1312 (P1)/ Page 1 of 11 INTI INTERNATIONAL UNIVERSITY A LEVEL PROGRAMME (CAL) CHM 1312: CHEMISTRY 2 (PAPER 1) MOCK EXAMINATION: JANUARY 2012 SESSION Instructions: Answer ALL questions. 1. The volume of 100 drops of an organic acid (M r = 350) is V cm 3. Each drop of the acid consists of n molecules and the density of the acid is 0.98 g cm -3, what is the expression for estimating Avogadro constant? A 0.98 x 100 x V 350 x n B 350 x 100 x n 0.98 x V C 0.98 x 100 x V x n 350 D 350 x n x V 100 x 0.98 2. A mixture of 8.0 g of a monoatomic gas X and an unknown quantity of diatomic gas Y has a volume of V m 3 at s.t.p. When 20.0 g of gas X is added to the mixture, under the same conditions, the volume of the mixture is 2V m 3. Calculate the quantity of gas Y in the mixture. [Relative atomic mass: X = 4, Y = 1. Assuming that gas X does not react with gas Y] A 2 g B 3 g C 5 g D 6 g 3. For which of the following is the ratio of the second ionisation energy to the first ionisation energy the highest? A Na B Mg C Al D Ar 4. The first five ionisation energy (kj mol -1 ) of an element X are: 578, 1817, 2745, 11 578, 14 831 X is found in which Group in the Periodic Table? A I B II C III D IV
CHM 1312 (P1)/ Page 2 of 11 5. Which of the following molecules would be linear? A H 2 O B Be 2 Cl 4 C SO 2 D NO 6. Which chlorine compound has the bonding that can be described as ionic with some covalent character? A LiCl B NaCl C ICl D AlCl 3 7. Which of the following exerts the highest pressure? A 1 mole of O 2 at a temperature of 28 C with a volume of 22.4 dm 3 B 1 mole of water at a temperature of 25 C with volume of 2.0 dm 3 C 1 mole of N 2 at a temperature of 0 C with a volume of 11.2 dm 3 D 1 mole of C 6 H 14 at its boiling point 8. A flask contains nitrogen, oxygen and chlorine at pressures of 50 kpa, 100 kpa and 80 kpa respectively. A certain amount of helium is forced into the flask at constant temperature and volume until the total pressure becomes 300 kpa. What is the partial pressure of nitrogen in the new mixture? A 50 kpa B 70 kpa C 130 kpa D 230 kpa 9. When a mixture of calcium oxide and carbon is heated strongly, calcium carbide is formed. CaO (s) + 3 C (s) CaC 2 (s) + CO (g) If the enthalpy changes of formation of CaO, CaC 2 and CO are -151.6 kj mol -1, -14.2 kj mol -1 and -26.4 kj mol -1 respectively. Calculate the enthalpy change of the reaction when 1.0 kg CaC 2 is formed. [A r : Ca = 40, C = 12, O = 16] A -1734.4 kj B -111.0 kj C + 111.0 kj D +1734.4 kj 10. 50cm 3 of acidified potassium manganate (VII) produces 0.10 mole of iodine when added to excess aqueous potassium iodide. What is the concentration (in mol dm -3 ) of the potassium manganate (VII) solution? A 0.4 B 0.8 C 1.0 D 1.2
CHM 1312 (P1)/ Page 3 of 11 11. PCl 5 (g) PCl 3 (g) + Cl 2 A mixture of 0.85 mol of PCl 5 and 0.18 mol of PCl 3 was allowed to attain the equilibrium in a 1 dm 3 flask at T K. Calculate the number of moles of PCl 5 remaining if the equilibrium constant at T K is 0.050. A 0.12 B 0.18 C 0.30 D 0.72 12. 1 mole of nitrogen and 3 moles of hydrogen are placed in a closed container and heated until the system achieved equilibrium at 500 C and 150 atm. N 2 (g) + 3 H 2 (g) 2 NH 3 (g) H = negative Which of the following changes would yield the greatest amount of ammonia when equilibrium is reestablished? A Addition of 1 mole of nitrogen at constant temperature. B Addition of iron as catalyst with cooling to 350 C. C Addition of 3 moles of hydrogen with cooling to 350 C. D Addition of 3 moles of hydrogen with cooling to 350 C and increasing the pressure to 300 atm. 13. Consider the Boltzman distribution curve below: The fraction of molecules having energy greater than E 2 at temperature T 2 is A R + Q P + Q B R + Q P C R _ P + Q D R + Q_ P + Q - R
CHM 1312 (P1)/ Page 4 of 11 14. One mole of the chloride of each of the following elements was added separately to water at 298 K. Which one of the following graphs correctly shows the ph of the solutions obtained? A B C D 15. Excess aqueous silver nitrate is added to an aqueous solution containing potassium iodide and potassium chloride. The precipitate is filtered and washed with distilled water. The precipitate is then shaken with excess aqueous ammonia and filtered again. What is present in the final residue? A AgCl B AgI C KCl D KI 16. Which property of beryllium is typical of Group II elements? A Beryllium fluoride is ionic B Beryllium chloride is covalent C Beryllium oxide is amphoteric D Beryllium hydroxide is amphoteric 17. Which of the following reactions does not involve the lone pair electrons on the nitrogen atom in the ammonia molecule? A NH 3 + HCl NH 4 Cl B NH 3 + H 2 O NH + 4 + OH - C 4NH 3 + 5O 2 4NO + 6H 2 O D NH 3 + AlCl 3 AlCl 3.NH 3 18. Nitrogen dioxide catalyses the production of acid rain from sulphur dioxide by A dissolving in rain water to form nitric acid B the catalytic oxidation of sulphur dioxide to sulphur trioxide C Increasing the degree of dissociation of sulphur dioxide D donating protons to sulphur dioxide molecules
CHM 1312 (P1)/ Page 5 of 11 19. Chlorofluorocarbons, CFCs, are responsible for the destruction of ozone in stratosphere. In the stratosphere, the CFC molecules are fragmented by ultra-violet radiation to produce chlorine free radicals, Cl. What is the composition of 35 Cl free radical? Number of protons Number of electrons Number of neutrons A 35 35 35 B 17 18 18 C 17 17 18 D 17 17 35 20. Trichloroethanoic acid, CCl 3 CO 2 H, is used in cosmetic surgery to perform a chemical peel to remove dead skin. Trichloroethanoic acid can be made by reacting chlorine with ethanoic acid. What is the mechanism of this reaction? A electrophilic addition B electrophilic substitution C free radical addition D free radical substitution 21. The number of possible isomers for an alcohol with molecular formula of C 4 H 10 O is A 3 B 4 C 5 D 6 22. The diagram shows the structure of the naturally-occurring molecule cholesterol. How many chiral centres are present in a cholesterol molecule? A 6 B 7 C 8 D 9
CHM 1312 (P1)/ Page 6 of 11 23. The products obtained by cracking an alkane, X, are methane, ethene and propene. The mole fraction of ethene in the products is 0.5. What is the identity of X? A C 6 H 14 B C 8 H 18 C C 9 H 20 D C 11 H 24 24. The following diagram represents the structure of a possible polymer. By which method might this polymer be made? A polymerise ethene followed by hydration B polymerise ethene followed by oxidation with cold acidified KMnO 4 C polymerise 1,2-dichloroethene followed by hydrolysis D polymerise 1,2-dichloroethene followed by oxidation with cold acidified KMnO 4 25. Which reaction would not give propene as one product? A adding an excess of concentrated sulfuric acid to propan-1-ol B adding warm aqueous sodium hydroxide to 2-bromopropane C adding warm ethanolic sodium hydroxide to 1-bromopropane D passing propan-2-ol vapour over heated aluminium oxide 26. Which isomer of C 6 H 13 OH gives the greatest number of different alkenes when it is dehydrated? A B C D
CHM 1312 (P1)/ Page 7 of 11 27. The characteristic odour of rum is attributed to the compound 2-ethyl-3-methylbutanoic acid. Which compound will produce 2-ethyl-3-methylbutanoic acid by heating under reflux with alcoholic sodium cyanide and subsequent acid hydrolysis of the reaction product? A B C D 28. Carvone gives the characteristic flavour to caraway and spearmint. Prolonged heating of carvone with hot concentrated acidified potassium manganate(vii) produces carbon dioxide and a compound X. X contains nine carbon atoms and reacts with 2,4-dinitrophenylhydrazine reagent. What is the maximum number of molecules of 2,4-dinitrophenylhydrazine that will react with one molecule of X? A 1 B 2 C 3 D 4
CHM 1312 (P1)/ Page 8 of 11 29. Which compound is a product of the hydrolysis of CH 3 CO 2 C 3 H 7 by boiling aqueous sodium hydroxide? A CH 3 OH B C 3 H 7 OH C C 3 H 7 CO 2 H D C 3 H 7 CO 2 - Na + 30. One of the characteristics of addition polymerisation is that the empirical formulae of the polymer and of its monomer are the same. The absorbent material in babies disposable nappies is made from the addition polymer shown. From which monomer could this addition polymer be obtained? A CH 3 CH(OH)CO 2 H B HOCH 2 CH 2 CO 2 H C H 2 C=CHCO 2 H D HO 2 CCH=CHCO 2 H
CHM 1312 (P1)/ Page 9 of 11 SECTION B For each of the questions in the section, one or more of the three numbered statements 1 to 3 may be correct. Decide whether each of the statements is or is not correct (you may find it helpful to put a tick against the statements that you consider to be correct). The responses A to D should be selected on the basis of A B C D 1 and 2 2 and 3 only are only are correct correct 1, 2 and 3 are correct No other combination of statements is used as a correct response. 1 only is correct 31. The proton number of argon and potassium is 18 and 19 respectively. However, their relative atomic mass is 40 and 39 respectively. Which of the following statements regarding the most abundant isotopes of argon and potassium is/are correct? 1 Atoms of argon contain more neutrons than atoms of potassium. 2 Atoms of argon contain more protons than atoms of potassium. 3 Atoms of argon contain more electrons than atoms of potassium. 32. Which of the following solutions contains the same number of particles as the number of particles in 250 cm 3 of 2.0 moldm -3 of sodium chloride? 1 1 dm 3 of 1.0 mol dm -3 of ethanol 2 500 cm 3 of 1.0 mol dm -3 of hydrochloric acid 3 500 cm 3 of 1.0 mol dm -3 of ethanoic acid 33. In which of the following molecules are arranged in order of increasing bond angle within the molecule? 1 CH 4, AlCl 3, CO 2 2 H 2 O,NH 3, CCl 4 3 HCl, SO 3, SO 2
CHM 1312 (P1)/ Page 10 of 11 34. Which of the following reactions take place at the electrodes during the extraction of aluminium by electrolysis? 1 Al 3+ + 3e - Al 2 2C + O 2 CO 3 2Al 2 O 3 + 3C 4Al + 3CO 2 35. N 2 O 4 (g) 2NO 2 (g) The K p for the above reaction is 2.5 x 10 2 at 200 C and 5.6 x10 2 at 550 C. It can be concluded that 1 the reverse reaction is exothermic 2 the formation of NO 2 is favoured by low pressure 3 dinitrogen tetraoxide is more stable at low temperature 36. Which of the following is/are true regarding strontium and its compound? 1 Strontium reacts with cold water to liberate hydrogen. 2 Strontium carbonate is a white solid that decomposes when heated. 3 Strontium nitrate decomposes to strontium peroxide, nitrogen dioxide and oxygen when heated strongly. 37. Exhaust gas from automobiles after passing through the catalytic converter is expected to contain 1 higher percentage of carbon dioxide 2 lower percentage of carbon monoxide 3 lower percentage of nitrogen oxide 38. Chlorofluorocarbons are suitable for used as propellant in aerosol cans because 1 they are volatile 2 they are inert 3 they are non-flammable
CHM 1312 (P1)/ Page 11 of 11 39. Glyceraldehyde, HOCH 2 CH(OH)CHO, is formed during photosynthesis, and contains a chiral carbon atom. Which reagents will react with glyceraldehyde to produce an organic product without a chiral carbon atom? 1 warmed acidified K 2 Cr 2 O 7 2 NaBH 4 3 Tollens reagent 40. The diagram shows some laboratory apparatus. Which preparations could this apparatus be used for? 1 bromoethane, from ethanol, sodium bromide and concentrated sulfuric acid 2 ethanal, from ethanol, sodium dichromate(vi) and sulfuric acid 3 1,2-dibromoethane, from bromine and ethene ~ The End ~ chm1312(p1)/janaury2012/formatted