Chemistry Higher level Paper 1
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1 N15/4/EMI/PM/ENG/TZ0/XX hemistry igher level Paper 1 Friday 13 November 2015 (afternoon) 1 hour Instructions to candidates Do not open this examination paper until instructed to do so. Answer all the questions. For each question, choose the answer you consider to be the best and indicate your choice on the answer sheet provided. The periodic table is provided for reference on page 2 of this examination paper. The maximum mark for this examination paper is [40 marks]. 15 pages International Baccalaureate Organization 2015
2 2 88 Ra (226) 56 Ba Sr a Mg Be Ac (227) 57 La Y Sc Th e f Zr Ti Pa Pr Ta Nb V U Nd W Mo r s Rb K Na Li Fr 87 (223) Atomic number Element Relative Atomic Mass 93 Np (237) 61 Pm Re Tc Mn Pu (242) 62 Sm Os Ru Fe Am (243) 63 Eu Ir Rh o m (247) 64 Gd Pt Pd Ni Bk (247) 65 Tb Au Ag u The Periodic Table 98 f (251) 66 Dy g d Zn Es (254) 67 o Tl In Ga Al B Fm (257) 68 Er Pb Sn Ge Si Md (258) 69 Tm Bi Sb As P N No (259) 70 Yb Po (210) 52 Te Se S O Lr (260) 71 Lu At (210) 53 I Br l F Rn (222) 54 Xe Kr Ar Ne e N15/4/EMI/PM/ENG/TZ0/XX
3 3 N15/4/EMI/PM/ENG/TZ0/XX 1. Which compound s molecular formula is the same as its empirical formula? A. 2 5 O B. 3 OO. 6 6 D The equation for the complete combustion of propene, 3 6, is shown below (g) + 9O 2 (g) 6O 2 (g) O (l) Which mixture, when ignited, will lead to incomplete combustion and the formation of O (g)? A. 2 dm 3 of propene and 10 dm 3 of oxygen B. 0.5 dm 3 of propene and 2.3 dm 3 of oxygen. 1 dm 3 of propene and 4 dm 3 of oxygen D. 3 dm 3 of propene and 14 dm 3 of oxygen 3. What is the percentage yield when 1.1 g of ethanal, 3 O, is obtained from 4.6 g of ethanol, 3 O? M r ( 3 O) = 46; M r ( 3 O) = 44 3 O (l) + [O] 3 O (l) + 2 O (l) A. B.. D Turn over
4 4 N15/4/EMI/PM/ENG/TZ0/XX 4. Which stage of operation immediately follows ionization in the mass spectrometer? A. Acceleration B. Deflection. Detection D. Vaporization 5. Which statement is correct about the first ionization energies of consecutive elements shown in the graph? 2000 First ionization energy / kj mol Atomic number [Source: Values from Nuffied Advance Science - Book of Data, Revised Edition (1984)] A. The graph falls between Be and B because there is an electron in the third energy level. B. The graph increases from B to N because the atomic radius is increasing.. The graph increases from Li to Ne because the number of electrons is increasing. D. The graph falls between Be and B because the outer electron in B is in a p sub-level.
5 5 N15/4/EMI/PM/ENG/TZ0/XX 6. Which element has the greatest first ionization energy? A. Al B. Ar. l D. s 7. Which elements are in the same group of the periodic table? A. a, Na, Rb, Sr B. Al, Ar, l, S. Au, g, Pb, Pt D. As, Bi, P, Sb 8. Which property of transition metals enables them to behave as catalysts? A. igh melting point B. Variable oxidation number. igh density D. Split d sub-levels 9. Which statement best describes the lattice structure of solid sodium chloride? A. Each sodium ion is surrounded by one chloride ion. B. Each chloride ion is surrounded by two sodium ions.. Each chloride ion is surrounded by four sodium ions. D. Each sodium ion is surrounded by six chloride ions. 10. Which compound is most likely to contain ionic bonding? A. lo 2 B. sl. Sl 2 D. Sil 4 Turn over
6 6 N15/4/EMI/PM/ENG/TZ0/XX 11. Which molecule is polar? A. 2 6 B. l 2. O 2 D. l What is the shape of the hexacyanoferrate(iii) ion, [Fe(N) 6 ] 3-? A. Square planar B. exagonal. Octahedral D. Trigonal bipyramidal 13. Which set contains two or more species with delocalized π electrons? A. 3 3, 2 =, 2 =O B. Nal, 6 6, 2 =O. O 3 2-, 6 6, 6 12 D. O 2, 3 O 3, 3 OO Which of the following changes are exothermic? I. 2 SO 4 (aq) + 2NaO (aq) Na 2 SO 4 (aq) O (l) II. III (g) + 17O 2 (g) 16O (g) O (g) 8 18 (g) 8 18 (l) A. I and II only B. I and III only. II and III only D. I, II and III
7 7 N15/4/EMI/PM/ENG/TZ0/XX 15. Which change represents the standard enthalpy change of formation? A. The formation of 1 mol of a compound in its standard state from its gaseous atoms B. The formation of 1 mol of a compound in its standard state from its elements. The formation of 1 mol of a compound in its standard state from its gaseous atoms in their standard states D. The formation of 1 mol of a compound in its standard state from its elements in their standard states 16. Which equation represents electron affinity? A. (g) + e (g) B. Na + (aq) + e Na (s). 1 2 l 2 (g) + e l (g) D. B (g) + e B + (g) + 2e 17. Which combination results in an ionic compound having the greatest magnitude of lattice enthalpy? Sum of ionic radii Ionic charges A. small large B. large large. large small D. small small 18. Under which conditions does a sample of the same mass of carbon dioxide have the lowest entropy value? A. Solid at high temperature B. Solid at low temperature. Gas at high temperature D. Gas at low temperature Turn over
8 8 N15/4/EMI/PM/ENG/TZ0/XX 19. urves I and II represent samples of the same gas at a constant pressure but at different temperatures. The areas under curves I and II are equal. What does curve II represent? Probability of molecules with kinetic energy E I II Kinetic energy E A. urve II is at the lower temperature and there are less molecules in the sample. B. urve II is at the lower temperature and there are the same number of molecules in the samples.. urve II is at the higher temperature and there are more molecules in the sample. D. urve II is at the higher temperature and there are the same number of molecules in the samples.
9 9 N15/4/EMI/PM/ENG/TZ0/XX 20. The graph shows a plot for a reaction with second-order kinetics. ow should the axes be labelled? y x x-axis y-axis A. concentration time B. time concentration. rate concentration D. concentration rate 21. Which factors affect the rate constant, k, of a reaction? I. atalyst II. III. oncentration of reactants Temperature A. I and II only B. I and III only. II and III only D. I, II and III Turn over
10 10 N15/4/EMI/PM/ENG/TZ0/XX 22. Which best describes a reaction in a state of equilibrium? A. The rates of the forward and reverse reactions are zero and the concentrations of products and reactants are equal. B. The rate of the forward reaction equals the rate of the reverse reaction and the concentrations of products and reactants are equal.. The rates of the forward and reverse reactions are zero and the concentrations of products and reactants are constant. D. The rate of the forward reaction equals the rate of the reverse reaction and the concentrations of products and reactants are constant. 23. The equilibrium concentrations of X, Y, Z and W are 1, 2, 4 and 2 mol dm 3 respectively. X (g) + 2Y (g) Z (g) + W (g) What is the value of the equilibrium constant, K c? A B D Which of the following molecules can act as a Lewis acid but not as a Brønsted Lowry acid? A. BF 3 B. Pl 3. N 3 D. 2 O 25. Which is a mol dm -3 solution of a weak acid? onductivity p A. poor 5 B. good 7. poor 10 D. good 3
11 11 N15/4/EMI/PM/ENG/TZ0/XX 26. What is the order of increasing acid strength? Approximate K a and pk a values at 298 K are given. K a pk a l OO O OO N A. l OO < 3 OO < 6 5 N + 3 < 6 5 O B. 6 5 O < 6 5 N + 3 < l OO < 3 OO. 6 5 O < 6 5 N + 3 < 3 OO < l OO D. 6 5 O < 3 OO < 6 5 N + 3 < l OO 27. Which solutions, mixed in equal concentrations and volumes, form an acid buffer solution? A. l (aq) + Nal (aq) B. 3 O 2 (aq) + 3 O 2 Na (aq). 3 O 2 (aq) + NaO (aq) D. 3 O 2 (aq) + 3 O 2 (aq) 28. Which salt forms the most acidic solution when dissolved in water? Salt Ionic radius of cation / m A. rl 3 63 B. Fel Mgl 2 65 D. Nal 98 Turn over
12 12 N15/4/EMI/PM/ENG/TZ0/XX 29. What is the buffer region in the acid base titration curves below? D p 5 B p 5 A 0 Volume of alkali added 0 Volume of alkali added 30. Which element undergoes reduction in the following reaction? (N 4 ) 2 r 2 O 7 (s) N 2 (g) O (l) + r 2 O 3 (s) A. r B.. N D. O 31. Which best describes reduction? A. Increase in oxidation number and gain of electrons B. Increase in oxidation number and loss of electrons. Decrease in oxidation number and gain of electrons D. Decrease in oxidation number and loss of electrons
13 13 N15/4/EMI/PM/ENG/TZ0/XX 32. What is E À, in V, for the following reaction? VO 2+ (aq) (aq) + V 2+ (aq) 2V 3+ (aq) + 2 O (l) Standard electrode potential, E À / V V 2+ (aq) + 2e V (s) 1.18 V 3+ (aq) + e V 2+ (aq) 0.26 VO 2+ (aq) (aq) + e V 3+ (aq) + 2 O (l) VO + 2 (aq) (aq) + e VO 2+ (aq) + 2 O (l) A B D What product is formed at the positive electrode (anode) when mol dm 3 2 SO 4 (aq) is electrolysed? A. ydrogen B. Oxygen. Sulfur D. Sulfur dioxide 34. Which pair of compounds can be distinguished by reacting them with dilute bromine water in the dark? A. 3 OO and 3 O B. 3 3 and ( 3 ) 2 and 3 3 D. 3 Br 3 and 3 Br 3 Turn over
14 14 N15/4/EMI/PM/ENG/TZ0/XX 35. Which compound is most soluble in water? A. 3 O B. 3 O. 3 O 2 D. 3 O Which are features of successive members of a homologous series? I. Similar chemical properties II. Same general formula III. Differ by A. I and II only B. I and III only. II and III only D. I, II and III 37. Which formula represents propanenitrile? A. 3 N B. 3 N. 3 N 2 D. 3 (N 2 ) Which halogenoalkane reacts fastest with warm NaO (aq)? A. ( 3 ) 3 l B. ( 3 ) 3 Br. 3 l D. 3 Br
15 15 N15/4/EMI/PM/ENG/TZ0/XX 39. Which is the geometric isomer of cis-1,2-dichlorocyclopropane? l A. B. l l l l l. D. l l l 40. Which is the best-fit line or best-fit curve for the points plotted on the graph? A. B.. D.
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