Chemistry Higher level Paper 1

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1 N17/4/EMI/PM/ENG/TZ0/XX hemistry igher level Paper 1 Wednesday 8 November 2017 (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]. 17 pages International Baccalaureate rganization 2017

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) 93 Np (237) 61 Pm (145) 75 Re Tc (98) 25 Mn Pu (244) 62 Sm s 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 Atomic number Element Relative atomic mass 98 f (251) 66 Dy g d Zn Es (252) 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 (209) 52 Te Se S Lr (262) 71 Lu At (210) 53 I Br l F Rn (222) 54 Xe Kr Ar Ne e Rf (267) 105 Db (268) 106 Sg (269) 107 Bh (270) 108 s (269) 109 Mt (278) 110 Ds (281) 111 Rg (281) 112 n (285) 113 Unt (286) 114 Uug (289) 115 Uup (288) 116 Uuh (293) 117 Uus (294) 118 Uuo (294) 2 N17/4/EMI/PM/ENG/TZ0/XX

3 3 N17/4/EMI/PM/ENG/TZ0/XX 1. ow many atoms of nitrogen are there in 0.50 mol of (N 4 ) 2 3? A. 1 B D Which solution neutralizes 50.0 cm 3 of mol dm -3 Na (aq)? A cm 3 of mol dm -3 3 P 4 B cm 3 of mol dm cm 3 of mol dm -3 2 S 4 D cm 3 of mol dm -3 N 3 3. What is the pressure, in Pa, inside a 1.0 m 3 cylinder containing 10 kg of 2 (g) at 25 º? R = 8.31 J K -1 mol -1 ; pv = nrt A. B D A compound with M r = 102 contains 58.8 % carbon, 9.80 % hydrogen and 31 % oxygen by mass. What is its molecular formula? A r : = 12.0; = 1.0; = 16.0 A B D Turn over

4 5. What is the number of protons and the number of neutrons in 131 I? 4 N17/4/EMI/PM/ENG/TZ0/XX Protons Neutrons A B D The graph represents the first ten ionisation energies (IE) of an element. Ionisation energy / ev Number of electrons removed What is the element? A. B. S. Ne D. l

5 5 N17/4/EMI/PM/ENG/TZ0/XX 7. Which electron configuration is that of a transition metal atom in the ground state? A. [Ne]3s 2 3p 6 4s 1 B. [Ar]3d 9. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 2 D. [Ar]4s 1 3d 5 8. Which trends are correct across period 3 (from Na to l)? I. Atomic radius decreases II. Melting point increases III. First ionization energy increases A. I and II only B. I and III only. II and III only D. I, II and III 9. Which oxide dissolves in water to give a solution with a p below 7? A. Mg B. Li 2. a D. P [ol 6 ] 3- is orange while [o(n 3 ) 6 ] 3+ is yellow. Which statement is correct? A. [ol 6 ] 3- absorbs orange light. B. The oxidation state of cobalt is different in each complex.. The different colours are due to the different charges on the complex. D. The different ligands cause different splitting in the 3d orbitals. Turn over

6 6 N17/4/EMI/PM/ENG/TZ0/XX 11. Which of the following series shows increasing hydrogen bonding with water? A. Propane < propanal < propanol < propanoic acid B. Propane < propanol < propanal < propanoic acid. Propanal < propane < propanoic acid < propanol D. Propanoic acid < propanol < propanal < propane 12. The electronegativity values of four elements are given. N F What is the order of increasing polarity of the bonds in the following compounds? A. < F 2 < N < F 4 B. F 4 < < F 2 < N. N < F 2 < < F 4 D. F 4 < N < F 2 < 13. What is the hybridization state and electron domain geometry around the circled, N and atoms? 3 3 N N N N 3 N A. sp 3 and tetrahedral sp 2 and trigonal planar sp 2 and trigonal planar B. sp 2 and trigonal planar sp and linear sp 3 and tetrahedral. sp 3 and tetrahedral sp and linear sp 2 and trigonal planar D. sp 3 and trigonal pyramidal sp 2 and trigonal planar sp 3 and trigonal pyramidal

7 14. ow many sigma (σ) and pi (π) bonds are present in this molecule? 7 N17/4/EMI/PM/ENG/TZ0/XX N σ π A B D Which statements are correct for ionic compounds? I. Lattice energy increases as ionic radii increase. II. Within the same group, the melting point of salts tends to decrease as the radius of the cation increases. III. Solubility in water depends on the relative magnitude of the lattice energy compared to the hydration energy. A. I and II only B. I and III only. II and III only D. I, II and III Turn over

8 16. What is the standard enthalpy of formation, in kj mol -1, of IF (g)? 8 N17/4/EMI/PM/ENG/TZ0/XX IF 7 (g) + I 2 (s) IF 5 (g) + 2IF (g) Ö = -89 kj Ö(IF f 7 ) = -941 kj mol 1 Ö(IF f 5 ) = -840 kj mol 1 A B D The combustion of glucose is exothermic and occurs according to the following equation: Which is correct for this reaction? (s) (g) 6 2 (g) (g) Ö S Ö Spontaneous/ non-spontaneous A. negative positive spontaneous B. negative positive non-spontaneous. positive negative spontaneous D. positive positive non-spontaneous 18. Which equation represents the lattice enthalpy of magnesium sulfide? A. MgS (s) Mg (g) + S (g) B. MgS (s) Mg + (g) + S - (g). MgS (s) Mg 2+ (g) + S 2- (g) D. MgS (s) Mg (s) + S (s)

9 9 N17/4/EMI/PM/ENG/TZ0/XX 19. The enthalpy change for the dissolution of N 4 N 3 is +26 kj mol -1 at 25. Which statement about this reaction is correct? A. The reaction is exothermic and the solubility decreases at higher temperature. B. The reaction is exothermic and the solubility increases at higher temperature.. The reaction is endothermic and the solubility decreases at higher temperature. D. The reaction is endothermic and the solubility increases at higher temperature. 20. The diagram shows the energy profile for a catalysed and uncatalysed reaction. Which represents the enthalpy change,, and the activation energy, E a, for the catalysed reaction? Potential energy x z y Reaction coordinate E a (catalysed reaction) A. z x + z B. z z + y. -z x D. z + x x Turn over

10 21. The rate expression for the reaction X (g) + 2Y (g) 3Z (g) is rate = k [X] 0 [Y] 2 By which factor will the rate of reaction increase when the concentrations of X and Y are both increased by a factor of 3? A. 6 B D N17/4/EMI/PM/ENG/TZ0/XX 22. Which pair of statements explains the increase in rate of reaction when the temperature is increased or a catalyst is added? Increasing temperature Adding a catalyst A. average kinetic energy of particles increases activation energy increases B. enthalpy change of reaction decreases average kinetic energy of particles increases. average kinetic energy of particles increases activation energy decreases D. activation energy increases enthalpy change of reaction decreases 23. At 700 º, the equilibrium constant, K c, for the reaction is (g) + S 2 (g) 2 2 S (g) Which relationship is always correct for the equilibrium at this temperature? A. [ 2 S] 2 < [ 2 ] 2 [S 2 ] B. [S 2 ] = 2[ 2 S]. [ 2 S] < [S 2 ] D. [ 2 S] 2 > [ 2 ] 2 [S 2 ]

11 11 N17/4/EMI/PM/ENG/TZ0/XX 24. What will happen if the pressure is increased in the following reaction mixture at equilibrium? 2 (g) + 2 (l) + (aq) + 3 (aq) A. The equilibrium will shift to the right and p will decrease. B. The equilibrium will shift to the right and p will increase.. The equilibrium will shift to the left and p will increase. D. The equilibrium will shift to the left and p will decrease cm 3 of an aqueous solution of sodium hydroxide of p = 10 is mixed with cm 3 of distilled water. What is the p of the resulting solution? A. 8 B D Which of the following will form a buffer solution if combined in appropriate molar ratios? A. l and Nal B. Na and Na. N 4 l and l D. l and N 3 Turn over

12 12 N17/4/EMI/PM/ENG/TZ0/XX 27. Which indicator is appropriate for the acid-base titration shown below? p Volume / cm 3 A. Thymol blue (pk a = 1.5) B. Methyl orange (pk a = 3.7). Bromophenol blue (pk a = 4.2) D. Phenolphthalein (pk a = 9.6) 28. Which statement is incorrect for a 0.10 mol dm -3 solution? A. p = 1 B. [ + ] << 0.10 mol dm -3. [ - ] is approximately equal to [ + ] D. is partially ionized

13 13 N17/4/EMI/PM/ENG/TZ0/XX 29. Which of the following is a redox reaction? A. 3Mg (s) + 2All 3 (aq) 2Al (s) + 3Mgl 2 (aq) B. Si 2 (s) + 2Na (aq) Na 2 Si 3 (aq) + 2 (l). Kl (aq) + AgN 3 (aq) Agl (s) + KN 3 (aq) D. 2Na 3 (aq) Na 2 3 (aq) + 2 (g) + 2 (l) 30. onsider the following half-equations: I 2 (s) + 2e - 2I - (aq) (brown) (colourless) E Ö = V Mn 4 - (aq) (aq) + 5e - Mn 2+ (aq) (l) (purple) (colourless) E Ö = V Which statement is correct for the reaction between KMn 4 (aq) and KI (aq) in acidic conditions? A. Mn 4 - reduces I - to I 2. B. I reduces Mn 4 to Mn 2+.. The colour changes from brown to purple. D. Mn 4 - is oxidized to Mn What are the products when an aqueous solution of copper(ii) sulfate is electrolysed using inert graphite electrodes? athode (negative electrode) Anode (positive electrode) A. u (s) 2 (g) B. 2 (g) u (s). u (s) 2 (g) D. 2 (g) 2 (g) Turn over

14 14 N17/4/EMI/PM/ENG/TZ0/XX 32. What are the oxidation states of chromium in (N 4 ) 2 r 2 7 (s) and r 2 3 (s)? (N 4 ) 2 r 2 7 (s) r 2 3 (s) A B D Propene reacts separately with 2 / + and 2 /Ni to give products X and Z respectively. What are the major products of the reactions? X 2 / /Ni Z X Z A. 3 () B () D. 3 () 3 3

15 34. What is the name of this compound, using IUPA rules? 15 N17/4/EMI/PM/ENG/TZ0/XX A. 3-methylbutan-3-ol B. 2-ethylpropan-2-ol. 2-methylbutan-2-ol D. 3-methylbutan-2-ol 35. What is the product of the reaction between pentan-2-one and sodium borohydride, NaB 4? A. Pentan-1-ol B. Pentan-2-ol. Pentanoic acid D. Pentanal 36. Which compound can be oxidized when heated with an acidified solution of potassium dichromate(vi)? A. 3 () 2 3 B. 3 2 () 3. ( 3 ) 3 D. 3 ( 2 ) 2 Turn over

16 37. What is the number of optical isomers of isoleucine? 16 N17/4/EMI/PM/ENG/TZ0/XX 3 3 N 2 A. 0 B D Which functional group is responsible for the pk b of 4.1 in this compound? l N N N A. Amido B. Amino. hloro D. Ether

17 39. Which compound gives this 1 NMR spectrum? 17 N17/4/EMI/PM/ENG/TZ0/XX hemical shift / ppm A B D A student performs an acid-base titration using a p meter, but forgets to calibrate it. Which type of error will occur and how will it affect the quality of the measurements? A. Random error and lower precision B. Systematic error and lower accuracy. Systematic error and lower precision D. Random error and lower accuracy

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