Dear students, For work related to organic chemistry structures and nomenclature, the following link is a useful molecule drawing tool that will tell you the preferred IUPAC name for any molecule you can think of: http://www.chemaxon.com/marvin/sketch/index.jsp And, it is kind of fun to play with. I used it to make the figures for problems 26-28. Cheers, Travis 1. Consider the reaction below: C6H12O6(s) + 12 O2(g) 6 CO2(g) + 6 H2O(g) Which of the following is an incorrect expression of the rate? 1. rate = (Δ[H2O] / 6·Δt) 2. rate = -(Δ [O2] / 12·Δt) 3. rate = (Δ[CO2] / 6·Δt) 4. rate = -(Δ [C6H12O6] / Δt) 2. The overall reaction Br2(g) + 2 NO2(g) 2 BrNO(g) + O2(g) Has an empirically determined rate law, rate = k·[NO2]2·[Br2]·[O2]-1. If k = 3.0 x 104 M-1·s-1, [NO2] = 0.01 M, [Br2] = 0.02 M and [O2] = 0.01 M, what is the observed rate? 1. 0.3 M·s-1 2. 0.0006 M·s-1 3. 300 M·s-1 4. 6.0 M·s-1 3. Consider the rate constants below: I. k = 7.45 x 10-2 M-2·s-1 II. k = 1.79 x 10-2 M3·s-1 III. k = 4.77 x 10-2 M1·s-1 Which response arranges them from lowest to highest order. 1. III, II, I 2. I, II, III 3. I, III, II 4. II, I, III 5. II, III, I 6. III, I, II 4. Consider the data below: Experiment number [A] M [B] M [C] M [D] M initial rate M·s-1 1 0.42 0.5 1.12 2.01 1.06 x 10-6 2 0.84 0.5 1.12 2.01 2.12 x 10-6 3 0.75 0.25 1.12 2.01 1.89 x 10-6 4 1.23 0.93 0.97 2.01 3.58 x 10-6 5 0.21 1.35 0.56 5.53 8.02 x 10-6 What is the overall order of this reaction? 1. 1 2. 2 3. 3 4. 4 5. Consider the elementary reaction: CH4(g) + 2 O2(g) CO2(g) + 2 H2O(g)If k = 9.7 x 106 M-1·hr-1, and there is initially 0.014 M H2O, how long will it take for the H2O concentration to reach 7.95 M? 1. 36 ms 2. 22 ms 3. 13 ms 4. 5 ms 6. Consider the elementary reaction: SO2(aq) + H2O(l) H2SO3(aq) If k = 1.21 x 10-4 M-1·s-1, and there is initially 2.3 M of SO2, what is the half life of the reaction? 1. 1.0 hr 2. 1.6 hr 3. 2.6 hr 4. not enough information 7. A student studying the kinetics of a reaction finds that the natural log of some concentration data produces a straight line when plotted as a function of time. What is the order of the reaction? 1. 0th order 2. 1st order 3. 2nd order 4. not enough information 8. Collision theory predicts that 1. raising a system's temperature will accelerate any reactions. 2. reaction intermediates are short-lived. 3. activation energy has no effect on reaction rate. 4. all collisions are productive. 9. Transition state theory assumes that formation of the transition state is (reversible/irreversible) and (does/doesn't) require a minimum amount of energy. 1. irreversible, does 2. reversible, doesn't 3. reversible, does 4. reversible, doesn't 10. What is the activation energy for a reaction that has a rate constant (k) of magnitude 4.03 x 105 and a pre-exponential factor (A) of 106? 1. 2.25 kJ·mol-1 2. 2.25 J·mol-1 3. 2,251 kJ·mol-1 4. not enough information 11. What is a reaction's activation energy of raising the temperature from 100 °C to 1000 °C causes the rate to increase by a factor of 5? 1. Ea = 1.2 kJ·mol-1 2. Ea = 1.5 kJ·mol-1 3. Ea = 3.9 kJ·mol-1 4. Ea = 7.1 kJ·mol-1 12. Consider the reaction mechanism below: step 1: H2O2 H2O• + O• step 2: CO + O• CO2• step 3: CO2• + H2O• H2O + CO2 overall: H2O2 + CO H2O + CO2 Which step must be the slow step if the reaction is experimentally determined to be 2nd order overall? 1. step 12. step 2 3. step 3 4. Any step. 13. Consider the reaction mechanism below: step 1: Cl + O3 ClO + O2 step 2: ClO + O3 Cl + 2 O2 overall: 2 O3 3 O2 Which species is a catalyst and which is an intermediate, respectively? 1. Cl, ClO 2. ClO, Cl 3. O3, O2 4. O2, O3 14. Consider the diagram below: How many steps does this reaction have? Which reverse step is the slowest? 1. 1, PTS2 2. 1, PI 3. 2, PI 4. 3, ISM 5. 2, ITS1 15. The (chlorine radical/catalytic converter) is a heterogeneous catalyst and (chlorine radical/catalytic converter) acts on only one substrate. 1. catalytic converter, chlorine radical 2. catalytic converter, catalytic converter 3. chlorine radical, catalytic converter 4. chlorine radical, chlorine radical 16. Consider the balanced reaction below: 2X (s) + 2H2O (l) 2XOH (aq) + H2 (g) The species 'X' would be which of the following? 1. an alkali metal 2. an alkaline earth metal 3. a halogen 4. a chalcogen 17. Which of the following is not true of alkaline earth metals? 1. React with halogens to form salts 2. Tend to form a +2 charge 3. Somewhat reactive toward water 4. Gain electrons to achieve noble gas configuration 5. Have 2 electrons in their highest energy shell 18. Which member of the boron family is a deadly poison1. Boron (B) 2. Aluminum (Al) 3. Gallium (Ga) 4. Indium (In) 5. Thallium (Tl) 19. The nitrogen group contains (1/2) non-metal(s), (1/2) metalloid(s) and (1/2) metal(s). Do not consider the synthetic superheavy element Ununpentium (Uup) in arriving at your answer. 1. 2, 1, 2 2. 1, 2, 2 3. 2, 2, 1 4. 1, 1, 1 5. 2, 2, 2 20. Which member of the carbon family is most abundant in Earth's crust? 1. Carbon (C) 2. Silicon (Si) 3. Germanium (Ge) 4. Tin (Sn) 5. Lead (Pb) 21. Which of the following statements is not true of the oxygen family? 1. They often have an oxidation number of -2 2. Are good reducing agents 3. Contains elements crucial to life 4. Are also called chalcogens 22. Which of the following is not true of the halogen family? 1. Its members are often found in their pure forms. 2. It contains the heaviest element required for life. 3. It contains most of the diatomic elements. 4. Its members are good oxidizing agents. 5. Its name mean salt-forming. 23. Alumina (Al2O3) is produced in which of the following processes? 1. Bayer process 2. Contact process 3. Hall process 4. Claus process 24. Which of the following gemstones is/are derived from aluminum oxides? I. Diamond II. Sapphire III. Ruby 1. I 2. II 3. III 4. I and II 5. I and III 6. II and III 7. none 25. How many structural isomers would a hydrocarbon of formula C5H10 have? (Hint: this is an unsaturated hydrocarbon, so its isomers either have one double bond
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