Chemistry Standard level Paper 1
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1 Chemistry Standard level Paper 1 Thursday 12 May 2016 (morning) 45 minutes 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 [30 marks]. 12 pages International Baccalaureate Organization 2016
2 2 88 Ra (226) 56 Ba Sr Ca Mg Be Ac (227) 57 La Y Sc Th Ce Hf Zr Ti Pa Pr Ta Nb V U Nd W Mo Cr Cs Rb K Na Li H Fr 87 (223) 93 Np (237) 61 Pm (145) 75 Re Tc (98) 25 Mn Pu (244) 62 Sm Os Ru Fe Am (243) 63 Eu Ir Rh Co Cm (247) 64 Gd Pt Pd Ni Bk (247) 65 Tb Au Ag Cu The Periodic Table Atomic number Element Relative atomic mass 98 Cf (251) 66 Dy Hg Cd Zn Es (252) 67 Ho Tl In Ga Al B Fm (257) 68 Er Pb Sn Ge Si C Md (258) 69 Tm Bi Sb As P N No (259) 70 Yb Po (209) 52 Te Se S O Lr (262) 71 Lu At (210) 53 I Br Cl F Rn (222) 54 Xe Kr Ar Ne He Rf (267) 105 Db (268) 106 Sg (269) 107 Bh (270) 108 Hs (269) 109 Mt (278) 110 Ds (281) 111 Rg (281) 112 Cn (285) 113 Unt (286) 114 Uug (289) 115 Uup (288) 116 Uuh (293) 117 Uus (294) 118 Uuo (294)
3 3 1. Which equation represents sublimation? A. 2Al (s) + 3I 2 (g) 2AlI 3 (s) B. HgCl 2 (s) HgCl 2 (g) C. I 2 (g) I 2 (s) D. CaCO 3 (s) + 2HCl (aq) CaCl 2 (aq) + CO 2 (g) + H 2 O (l) 2. For which compound is the empirical formula the same as the molecular formula? A r (H) = 1; A r (C) = 12; A r (O) = 16 Empirical formula Molar mass / g mol 1 A. CO 2 H 90 B. CH 3 O 62 C. C 2 H 4 O 88 D. C 4 H 8 O In which mixture is NaOH the limiting reagent? A mol NaOH mol H 2 SO 4 B mol NaOH mol H 2 SO 4 C mol NaOH mol HNO 3 D mol NaOH mol HNO 3 4. Why do gases deviate from the ideal gas law at high pressures? A. Molecules have finite volume. B. Cohesive forces increase the volume from the ideal. C. Increasing pressure increases the temperature of the gas. D. Collisions between molecules occur more frequently as pressure increases. Turn over
4 4 5. Which is correct for the chromium isotope Cr? A. 24 neutrons and 53 nucleons B. 24 protons and 29 nucleons C. 24 protons and 29 neutrons D. 24 electrons and 53 neutrons 6. Which electron configuration is correct for the selenide ion, Se 2? A. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4d 10 4p 4 B. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4d 10 4p 6 C. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 4 D. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 7. Which element is a metalloid? A. Co B. As C. Cs D. Es 8. Which periodic trend is described correctly? Trend in Down the group (top to bottom) Across the period (left to right) A. atomic radius increases increases B. ionic radius decreases increases C. first ionization energy decreases decreases D. electronegativity decreases increases
5 5 9. Which molecule is non-polar? A. OF 2 B. NH 3 C. BF 3 D. SO Which compound contains both ionic and covalent bonds? A. SiH 4 B. NaNO 3 C. H 2 CO D. Na 2 S 11. Which compound has resonance structures? A. C 6 H 12 B. CH 3 CHO C. NaBr D. Na 2 CO Which of the following are van der Waals forces? I. Dipole-dipole forces II. Hydrogen bonds III. London (dispersion) forces A. I and II only B. I and III only C. II and III only D. I, II and III Turn over
6 6 13. When 25.0 cm mol dm 3 NaOH (aq) is mixed with 25.0 cm mol dm 3 HCl (aq) at the same temperature, a temperature rise, T, is recorded. What is the expression, in kj mol 1, for the enthalpy of neutralisation? (Assume the density of the mixture = 1.00 g cm 3 and its specific heat capacity = 4.18 kj kg 1 K 1 = 4.18 J g 1 K 1 ) A. B. C. D T T T T What is the enthalpy of formation of ethyne, in kj mol 1, represented by the arrow Y on the diagram? 5 CH ( g) + O ( g) C(graphite) + H ( g) + O ( g) Y 788 kj CO (g) + H ( g) + O ( g) kj 286 kj 2CO 2 (g) + H 2 O (l) A B C D
7 7 15. Which equation represents the average bond enthalpy of the Si H bond in SiH 4? A. SiH 4 (g) SiH 3 (g) + H (g) B. 1 4 SiH (g) 1 4 Si (g) + H (g) 4 C. SiH 4 (g) SiH 3 (g) H 2 (g) D. SiH 4 (g) Si (g) + 4H (g) 16. Which conditions must be met for a reaction to take place? I. Reactants collide with sufficient energy. II. Reactants collide with correct orientation. III. Reactants must be in the same state. A. I and II only B. I and III only C. II and III only D. I, II and III Turn over
8 8 17. Graph 1 shows a plot of volume of CO 2 (g) against time for the reaction of CaCO 3 (s) with 1.00 mol dm 3 HCl (aq). The acid is the limiting reagent and entirely covers the lumps of CaCO 3 (s). Which set of conditions is most likely to give the data plotted in graph 2 when the same mass of CaCO 3 (s) is reacted with the same volume of HCl (aq) at the same temperature? Volume of CO 2 (g) graph 2 graph 1 Time Size of lumps Concentration of acid / mol dm 3 A. larger 1.00 B. smaller 0.05 C. smaller 1.00 D. larger What is the effect of increasing temperature on the equilibrium? ClNO 2 (g) + NO (g) ClNO (g) + NO 2 (g) H À = 18.4 kj Position of equilibrium K c A. moves to left decreases B. moves to left no change C. moves to right no change D. moves to right increases
9 9 19. Which is a conjugate Brønsted Lowry acid-base pair? CH 3 COOH (aq) + H 2 O (l) CH 3 COO (aq) + H 3 O + (aq) A. CH 3 COO / H 3 O + B. H 2 O / CH 3 COO C. H 2 O / H 3 O + D. CH 3 COOH / H 2 O 20. Which of the following gases does not result in acid deposition? A. CO 2 B. NO 2 C. NO D. SO Applying IUPAC rules, what is the name of MnO 2? A. Magnesium(II) oxide B. Manganese(II) oxide C. Magnesium(IV) oxide D. Manganese(IV) oxide 22. Which statement is correct for a voltaic but not for an electrolytic cell? A. An electrolyte is required. B. The anode is where oxidation occurs. C. Ions move in the electrolyte. D. Electrons flow from the negative electrode to the positive electrode. Turn over
10 How many alcohols have the general formula C 4 H 10 O? A. 3 B. 4 C. 5 D What is the general formula of the alkyne series? A. C n H n B. C n H 2n 2 C. C n H 2n D. C n H 2n Which compound can both be esterified and turn acidified potassium dichromate(vi) solution green? A. (CH 3 ) 3 COH B. CH 3 CH 2 CO 2 H C. (CH 3 ) 2 CHOH D. CH 3 CH 2 COCH What is the mechanism of the reaction between ethane and chlorine in sunlight? A. Free radical substitution B. Free radical addition C. Electrophilic substitution D. Electrophilic addition
11 A measuring cylinder was used to obtain a known volume of a liquid. The volume was read from the top of the meniscus and the liquid completely emptied into a flask. The exact same process was then repeated. Which statement is correct about the overall described procedure and the volumes measured? A. There is a systematic error and the volumes measured are accurate. B. There is a random error and the volumes measured are accurate. C. There is a random error and the volumes measured are inaccurate. D. There is a systematic error and the volumes measured are inaccurate. 28. What is the relationship between the two variables sketched on the graph? y x A. y is proportional to x B. y is inversely proportional to x C. y is proportional to x D. y decreases exponentially with an increase in x 29. Which feature of a molecule can be determined from its 1 H NMR spectrum? A. Number of hydrogen environments B. Total mass of hydrogen atoms present C. Vibration frequency of C H bonds D. Ionization energy of a hydrogen atom Turn over
12 Which molecule has an index of hydrogen deficiency (IHD) = 1? A. C 6 H 6 B. C 2 Cl 2 C. C 4 H 9 N D. C 2 H 6 O
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