Chemistry 112 Name Exam I Form A Section February 3,
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1 Chemistry 112 Name Exam I Form A Section February 3, IMPORTANT: On the scantron (answer sheet), you MUST clearly fill your name, your student number, section number, and test form (white cover = test form A; yellow cover = test form B). Use a #2 pencil. There are 25 questions on this exam. Check that you have done all of the problems and filled in the first 25 bubbles on the scantron.your score will be reported in percent (max 100%). Exam policy Hints Calculators with text-programmable memory are not allowed. Relevant data and formulas, including the periodic table, are attached at the end of this exam. Your grade will be based only on what is on the scantron form. The answer key will be posted on the web after the exam (on the Exam Schedule page). You must turn in your cover sheet with your scantron answer form. As you read the question, underline or circle key words to highlight them for yourself. Avoid errors from "mis-reading" the question. Pay attention to units and magnitudes (decimal places) of numbers obtained from calculations. There is no penalty for guessing. 1
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3 CHEMISTRY 112 EXAM 1 Feb. 3, 2015 FORM A 1. A gas phase reaction is studied and the activation energy and reaction energy are determined. Which of the following reaction profiles is consistent with this information? E a = 20 kj/mol, E = kj/mol A. B. C. D. E. 3
4 2. When N 2 O 5 (g) decomposes as shown below at a fixed temperature, the rate of formation of NO 2 is M/s 2 N 2 O 5 (g) 4 NO 2 (g) + O 2 (g) What is the rate of loss of N 2 O 5 under these conditions? A M/s B M/s C M/s D M/s E M/s 3. The rate law for the following reaction is rate = k [NO] 2 [H 2 ] 2 NO(g) + 2 H 2 (g) N 2 (g) + 2 H 2 O(g) If the concentration of NO is tripled, while everything else is kept the same, what will happen to the rate of the reaction? A. It remains unchanged. B. It triples. C. It is reduced by a factor of 3. D. It increases by a factor of 6. E. It increases by a factor of The experimentally determined rate law for the following reaction is: rate = k [Cl 2 ] ½ [CHCl 3 ] Cl 2 (g) + CHCl 3 (g) HCl(g) + CCl 4 (g) What is the unit of the rate constant for this reaction? A. M s 1 B. M 1 s 1 C. M ½ s 1 D. M ½ s 1 E. M ½ s ½ 4
5 5. One way enzyme catalysts increase the rate of reactions is by: A. decreasing the energy of the products. B. shifting the equilibrium to favor product formation. C. increasing the temperature during the reaction. D. decreasing the activation energy of the reaction. E. increasing the activation energy of the reaction. 6. The isotope cadmium-116 is most likely to decay by which of the following decay modes? A. alpha decay B. beta decay C. electron capture D. positron emission E. Both C and D 7. An atom of 238 U undergoes 6 rounds of alpha decay and 5 rounds of beta decay. What is the resultant isotope? A. B. C. D. E. 214 Bi 214 Re 226 At 226 Re 214 At 8. Why do the rates of reactions increase when the concentrations of reactants are increased? A. There is an increase in the magnitude of the rate constant. B. The average kinetic energy of the reactants increases. C. It ensures that all of the reactants will collide with the proper orientation for reaction. D. It lowers the energy of the transition state. E. It increases the frequency of collisions. 5
6 9. An experiment was run at 298 K and the following data were collected and plotted: The slope is s 1 and the y-intercept is What is the order of the reaction, and what is the half-life? Order Half-life A. second 49.5 sec B. second sec C. first 2.4 sec D. first 49.5 sec E. first sec 10. A first-order reaction is 4 times faster at 50 C than it is at 25 C. What is the activation energy of this reaction? A kj/mol B kj/mol C kj/mol D kj/mol E kj/mol 6
7 11. The following data was collected for the recombination reaction of iodine atoms in the presence of Ar. What is the rate law for this reaction? 2 I(g) + Ar(g) I 2 (g) + Ar(g) [I] (M) [Ar] (M) Initial rate (M/s) A. rate = k [I] [Ar] B. rate = k [I] 2 C. rate = k [Ar] D. rate = k [I] E. rate = k [I] 2 [Ar] 12. The progress of a reaction of A 2 B is shown below. Each white sphere represents M of A, each gray sphere represents M of B. What is the average rate of disappearance of A during this time interval? t = 0 s t = 35 s A M s 1 B M s 1 C M s 1 D M s 1 E M s 1 7
8 13. The observed rate law for the reaction: 2 NO (g) + Br 2 (g) 2 NOBr (g) is Rate = k [NO] 2 [Br 2 ] Which of the following mechanisms is/are consistent with the observed rate law? Mechanism I: NO (g) + Br 2 (g) NOBr 2 (g) NOBr 2 (g) + NO (g) 2 NOBr (g) Mechanism II: NO (g) + Br 2 (g) NOBr 2 (g) NOBr 2 (g) + NO (g) 2 NOBr (g) Mechanism III: NO (g) + NO (g) N 2 O 2 (g) N 2 O 2 (g) + Br 2 (g) 2 NOBr (g) (fast) (slow) (slow) (fast) (fast) (slow) A. I only B. II only C. III only D. I and III only E. II and III only 14. Dr. Rick T. Cat, a famous scientist, and his team of intrepid graduate students invent a new element, Nittnium. One isotope of Nittnium is radioactive and decays with a half-life of 409 seconds. At this rate, how long will it take for 87.5% of a sample to be consumed? A. 79 sec B. 358 sec C. 562 sec D. 818 sec E. 1,227 sec 8
9 15. Each line in the graph below represents a different reaction. Rank the reactions in order of increasing activation energy. Rxn 1: Rxn 2: Rxn 3: A. 1 < 2 < 3 B. 1 < 3 < 2 C. 2 < 3 < 1 D. 3 < 1 < 2 E. 3 < 2 < A wooden artifact discovered in the Sahara desert by Rick T. Cat is sent to the lab to be carbon dated. It possesses a 14 C activity of 10.2 disintegrations per second. Given that the half-life of 14 C is 5,715 years and the activity of an equal mass of freshly cut wood has a constant value of 15.2 disintegrations per second, how old is the artifact? A years B. 1,234 years C. 10,928 years D. 4,230 years E. 3,290 years 9
10 17. Butadiene (C 4 H 6 ) is used mainly in the production of synthetic rubber. A reaction of C 4 H 6 was studied at 326 C, and the results (1/[C 4 H 6 ] as a function of time) are shown in the figure below. The y-intercept of the plot is 58.1 M 1, and the slope of the line is s 1. If the experiment is repeated with an initial C 4 H 6 concentration of M, how long would it take to decompose half of the C 4 H 6? A sec B sec C sec D sec E sec 10
11 18. A student studies a first order reaction under several different conditions and gets the results shown in the plot below. Which of the following conclusions about these experiments are correct? ln[a] A. only 1 is correct B. only 2 is correct C. only 3 is correct D. 1 and 3 are correct. E. 2 and 3 are correct. Time 1. Reactions 1 and 2 were done at the same temperature but with different starting concentrations. 2. Reactions 2 and 3 were done at the same temperature but with different starting concentrations. 3. Reaction 2 was done at a lower temperature than reaction 3. 11
12 For the next two questions, consider the following mechanism which involves the oxidation of iodide ion by hydrogen peroxide in acid solution: Step 1 (slow) H 2 O 2 (aq) + I (aq) H 2 O(l) + OI (aq) Step 2 (fast) Step 3 (fast) H + (aq) + OI (aq) HOI(aq) HOI(aq) + H + (aq) + I (aq) I 2 (aq) + H 2 O(l) Which of the following statements are true? A. OI and HOI are catalysts B. OI and HOI are intermediates C. OI is a catalyst and HOI is an intermediate D. HOI is a catalyst and OI is an intermediate E. There are no catalysts or intermediates in this mechanism For the mechanism above to be consistent with the kinetic data, what must be the experimental rate law? A. Rate = k [H 2 O 2 ][H + ] 2 [I ] 2 B. Rate = k [I 2 ][H 2 O] 2 C. Rate = k [H 2 O 2 ][I ] D. Rate = k [H + ][OI ] E. Rate = k [HOI][H + ][I ] 12
13 21. The following graph depicts the belt of stability: Which one of the following statements concerning nuclear decay processes is TRUE? A. A 1:1 neutron-to-proton ratio is ideal for maximum nuclear stability for ALL elements on the periodic table. B. Isotopes above the belt have too many neutrons; during decay neutrons are converted into protons. C. Isotopes below the belt have too many neutrons; during decay electrons are captured and converted into protons. D. Isotopes that decay via positron emission convert neutrons into protons. E. No element undergoes alpha decay unless bombarded with neutrons in a nuclear reactor. 13
14 22. What is the nuclear binding energy of iron-56 in kj/mol? The mass of the iron-56 nucleus is amu. A kj/mol B kj/mol C kj/mol D kj/mol E kj/mol 23. The activation energy for the industrial drying of tomato, an important method of food preservation, is 33.3 kj/mol. How many times faster does this process proceed at 200 C than at 25 C? A. 1.2 B. 5.0 C. 144 D E Rick T. Cat participated in the first manned mission to Mars! He collected a mineral sample from Mars to send back to earth for analysis. It contains 68 mg of uranium-235 and 22 mg of lead-206. Assuming that the mineral sample started as pure uranium-235, what is the age of the Martian rock? The half-life process for uranium-235 lead-206 is years. A years B years C years D years E years 14
15 25. In organic chemistry, cis/trans isomerism describes the relative orientation of functional groups within a molecule. Alkene containing compound but-2-ene can interconvert from the cis isomer to the trans isomer at 80 o C with an activation energy of 65.0 kj/mol. At the same temperature with a nitric oxide (NO) catalyst, the activation energy decreases to 27.5 kj/mol. Assuming the frequency factor is the same for the catalyzed and uncatalyzed reactions, how many times faster is the catalyzed reaction than the uncatalyzed reaction at 80 o C? A B C D E cis-but-2-ene trans-but-2-ene END OF EXAM 15
16 16
17 CHEM 112 Sp15 Exam 1 - Form A Scrap Paper 17
18 18 CHEM 112 Sp15 Exam 1 - Form A Scrap Paper
19 Chem 112 Equations Constants, Conversions And Equations For Use During Exams And Quizzes Conversions Constants 1J kg m 2 s 2 C V c m s 1 R L atm mol 1 K 1 1A C s 1 h J s R J mol 1 K 1 1g amu F 96,485 C mol 1 1 n amu 0 N A mol 1 1 p amu 1 K W at 25 o C k Ae E a RT ln k E a RT ln A Equations Rate kn G H T S nfe ln A ln A 0 kt E= h hc ln N t N t t 12 kt G o RT log K RT ln K G G o RT ln Q ln k 1 E a 1 1 k 2 R T 2 T E=mc 2 G G o RT log Q 1 t 12 ln2 k K k a K b K W H OH E o log K n 1 1 kt ph pk A A a log X E E o log Q 0 HX n at 25 o C at 25 o C n pk W ph poh pk a pk b K p =K c RT Molecular Orbital Theory Diagrams Crystal Field Theory Diagram Color Wheel with Wavelength Ranges
20 PERIODIC TABLE of the ELEMENTS MAIN GROUPS MAIN GROUPS 1A 1 8A 18 1 H A 2 3A 13 4A 14 5A 15 6A 16 7A 17 2 He Li Be TRANSITION METALS 5 B C N O F Ne Na Mg B 3 4B 4 5B 5 6B 6 7B 7 8B 8 8B 9 8B 10 1B 11 2B Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc [98] 44 Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po [209] 85 At [210] 86 Rn [222] 87 Fr [223] 88 Ra [226] 89 Ac** [227] 104 Rf [261] 105 Db [262] 106 Sg [266] 107 Bh [264] 108 Hs [265] 109 Mt [268] 110 [269] 111 [272] 112 [277] 114 [285] 116 [289] 118 [293] * LANTHANOIDS 58 Ce Pr Nd Pm [145] 62 Sm Eu Gd Tb Dy Ho Er Tm Yb Lu ** ACTINOIDS 90 Th Pa U Np [237] 94 Pu [244] 95 Am [243] 96 Cm [247] 97 Bk [247] 98 Cf [251] 99 Es [252] 100 Fm [257] 101 Md [258] 102 No [259] 103 Lr [262]
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