M10/4/CHEMI/SPM/ENG/TZ2/XX+ CHEMISTRY. Wednesday 12 May 2010 (afternoon) 45 minutes INSTRUCTIONS TO CANDIDATES
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1 M10/4/CHEMI/SPM/ENG/TZ/XX CHEMISTRY standard level Paper 1 Wednesday 1 May 010 (afternoon) 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 of this examination paper pages International Baccalaureate Organization 010
2 M10/4/CHEMI/SPM/ENG/TZ/XX+ 88 Ra (6) 56 Ba Sr Ca Mg Be Ac (7) 57 La Y Sc Th Ce Hf Zr 91. Ti Pa Pr Ta Nb V U Nd W Mo Cr Cs Rb K Na.99 3 Li H Fr 87 (3) Atomic Number Element Atomic Mass 93 Np (37) 61 Pm Re Tc Mn Pu (4) 6 Sm Os Ru Fe Am (43) 63 Eu Ir Rh Co Cm (47) 64 Gd Pt Pd Ni Bk (47) 65 Tb Au Ag Cu The Periodic Table 98 Cf (51) 66 Dy Hg Cd Zn Es (54) 67 Ho Tl In Ga Al B Fm (57) 68 Er Pb Sn Ge Si C Md (58) 69 Tm Bi Sb As P N No (59) 70 Yb Po (10) 5 Te Se S O Lr (60) 71 Lu At (10) 53 I Br Cl F Rn () 54 Xe Kr Ar Ne 0.18 He
3 3 M10/4/CHEMI/SPM/ENG/TZ/XX+ 1. What is the coefficient of Fe 3 O 4 when the following equation is balanced using the lowest whole numbers? A. B. 3 C. 4 D. 5 Al(s) + Fe O ( s) Al O ( s) + Fe(s) What is the mass, in g, of one molecule of ethane, C H 6? A B C. 30 D Which molecular formula is also an empirical formula? A. PCl 3 B. C H 4 C. H O D. C 6 H 1 O 6 4. Which of the following is consistent with Avogadro s law? A. B. P = constant (V, n constant) T V = constant (P, n constant) T C. V n = constant (P, T constant) D. V n = constant (P, T constant) Turn over
4 4 M10/4/CHEMI/SPM/ENG/TZ/XX+ 5. A sample of element X contains 69 % of 63 X and 31 % of 65 X. What is the relative atomic mass of X in this sample? A B C D How many electrons does the ion 15 P contain? A. 1 B. 15 C. 16 D What is the electron arrangement of the Mg + ion? A., B.,8 C.,8, D.,8,8 8. Which property decreases down group 7 in the periodic table? A. Melting point B. Electronegativity C. Atomic radius D. Ionic radius
5 5 M10/4/CHEMI/SPM/ENG/TZ/XX+ 9. Which oxides produce an acidic solution when added to water? I. P 4 O 10 II. MgO III. SO What is the formula of magnesium fluoride? A. Mg F 3 B. Mg F C. Mg 3 F D. MgF 11. What is the shape of the ammonia molecule, NH 3? A. Trigonal planar B. Trigonal pyramidal C. Linear D. V-shaped (bent) 1. Which molecule is polar? A. CH Cl B. BCl 3 C. Cl D. CCl Turn over
6 6 M10/4/CHEMI/SPM/ENG/TZ/XX+ 13. Which substance can form intermolecular hydrogen bonds in the liquid state? A. O B. CH OH C. CHO D. CH 14. Which compound has a covalent macromolecular (giant covalent) structure? A. MgO (s) B. Al O 3 (s) C. P 4 O 10 (s) D. SiO (s) 15. The standard enthalpy changes for the combustion of carbon and carbon monoxide are shown below. C(s) + O (g) CO (g) = 394 kj mol Ö 1 H c 1 Ö CO(g) + O(g ) CO(g ) H c = 83 kj mol What is the standard enthalpy change, in kj, for the following reaction? A. 677 B. 111 C D C(s) + O (g) CO(g)
7 7 M10/4/CHEMI/SPM/ENG/TZ/XX+ 16. Which is correct about energy changes during bond breaking and bond formation? Bond breaking Bond formation A. exothermic and H positive endothermic and H negative B. exothermic and H negative endothermic and H positive C. endothermic and H positive exothermic and H negative D. endothermic and H negative exothermic and H positive 17. Which processes are exothermic? I. Ice melting II. Neutralization III. Combustion 18. Which unit could be used for the rate of a chemical reaction? A. mol B. mol dm 3 C. mol dm 3 s 1 D. dm Turn over
8 8 M10/4/CHEMI/SPM/ENG/TZ/XX+ 19. Which of the following can increase the rate of a chemical reaction? I. Increasing the temperature II. Adding a catalyst III. Increasing the concentration of reactants 0. What is the equilibrium constant expression, K c, for the following reaction? NO(g) NO (g) 4 NO A. K c = [ ] [ NO] 4 NO B. K c = [ ] [ NO ] NO C. K c = [ ] [ NO ] D. K c = [ NO][ NO 4] Consider the endothermic reaction below. 5CO(g) + IO(g) 5CO (g) + I(g) 5 According to Le Chatelier s principle, which change would result in an increase in the amount of CO? A. Increasing the temperature B. Decreasing the temperature C. Increasing the pressure D. Decreasing the pressure
9 9 M10/4/CHEMI/SPM/ENG/TZ/XX+. Which species behave as Brønsted-Lowry acids in the following reversible reaction? A. HCN and CN B. HCN and HPO 4 C. H PO 4 and HPO 4 D. HCN and H PO 4 HPO ( aq) + CN ( aq) HCN (aq) + HPO ( aq) Which of the following are weak acids in aqueous solution? I. COOH II. H CO 3 III. HCl 4. In which species does sulfur have an oxidation number of 0? A. SO 3 B. S 8 C. Na SO 4 D. H S Turn over
10 10 M10/4/CHEMI/SPM/ENG/TZ/XX+ 5. What is the reducing agent in the reaction below? A. Br B. BrO 3 C. MnO 4 MnO ( aq) + Br ( aq) + HO(l) MnO (s) + BrO ( aq) + OH ( aq) 4 3 D. MnO 6. Which changes could take place at the positive electrode (cathode) in a voltaic cell? I. Zn + (aq) to Zn (s) II. Cl (g) to Cl (aq) III. Mg (s) to Mg + (aq) 7. What is the structural formula of,3-dibromo-3-methylhexane? A. CHBrCHBrCH( )CH B. CHBrCBr( )CH CH C. CH CHBrCBr(CH ) D. CHBrCHBrCH(CH )
11 11 M10/4/CHEMI/SPM/ENG/TZ/XX+ 8. What happens when a few drops of bromine water are added to excess hex-1-ene and the mixture is shaken? I. The colour of the bromine water disappears. II. III. The organic product formed does not contain any carbon-carbon double bonds. -bromohexane is formed. 9. What is the product of the following reaction? A. COOH CH CH(OH)CH 3 3 CrO7 / H + B. CO C. CH COOH D. CH 30. How many significant figures are there in ? A. B. 3 C. 5 D
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