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Exam 3 - Version 155 ~ Exam 3 w Laude(52390 i This...

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Unformatted text preview: Version 155 ~- Exam 3 w Laude - (52390) i This print—out should have 30 questions. Multiple—choice questions may COntinue on the next column or page w find all choices before answering. 001 10.0 points Transition state theory states that 1. inoiecuies must collide in order to react. 2. temperature does not affect rate. @a set of reactants must achieve their tran~ sition state before forming precincts. 4. intermediates are shortwlived. 002 10.0 points Which member of the oxygen family is the major component (by mass) of Earth’s Crust? 1. Selenium (Se) {a} Oxygen (O) 3. Tellurium (Te) 4. Sulfur (S) 5. Poloniuni (Po) 003 10.0 points Consider the elementary reaction: Ba003(aq) —> C02(aq) + 3210(5) If! 2 2.85 X 102 M . 3—1, and there is initially 1 M BaCOg , what is the half—life of the reaction? 3. not enough information 4. 3.5 ms 004 10.0 points Which of the following is not true of fluorine (F)? 1. It is a diatomic gas at room tempera— ture. 2. It tends to form insoluble salts and min- erais. 3. It’s anion has high charge density. ({1} It’s anion is abundant in Earth’s oceans. 5. It is a powerful oxidizing agent. 005 10.0 points A certain reaction has an activation energy (Ea) of 1.2 kJ - mol‘1 and a rate constant (k) of 2.3 >< 103 s“1 at room temperature. At 0 CT) , what will the rate constant be? @a m 2.2 x 103 Version 155 w Exam 3 — Laude ~ (52390) 2 2. kg :2 2.4 x 103 3. cannot be determined 4.132 a 2.3 x103 006 10.0 points How many structural isomers would a hydrow carbon of formula 0533 have? 1. 5 isomers @ 3 isomers 3. 4 isomers 4. 1 isomer 5. 2 isomers 007 10.0 points A nucleotide is composed of which of the following components? I) a nucleobase (eg. guanine) II) a sugar (eg. ribose) III) a phosphate group 1. II and III 2. II oniy 3. I only 4. III only 5. I and II (a r, n and m 7. I and III 008 10.0 points Boron’s 3 valence electrons make it difficult for it to achieve an octet. What famous ailotrope of Boron enables it to achieve an oc et? 1322 are 3. B2 4. 135 009 10.0 points Consider the data beiow: [NO] [002] initial rate M M M - srl Exp 1 0.41 1.2 2.178 X 10—1 Exp 2 0.8 2.4 8.572 x 10“} Exp 3 0.4 0.6 2.178 x 10—1 Which of the following is a correct rate law for the reaction? ,1“. k - {oog]2[N0]“1 ’2’.A+[002]2 @MNOP seine] ak-[N0]-[Cog] 010 10.0points For a certain 3ml order reaction, k = 2.35 x 104 chsy. What would be the values of x and y, respectively? 1. —3,—1 2. 2,1 3. re 4. 3,4 5. ml,«~2 011 10.0 points Consider the elementary reaction: (3114(9) + 202(9) —> 002(9) “i” 211200?) Version 155 ~ Exam 3 — Laude ~ (52390) 3 If k z 4.8 X 102 M4 -s"‘]', and there is iniw tially 0.65 M 002 , how long will it take for the 002 concentration to reach 0.? M ? ‘1; «w v‘ 1. 3-rns me. “in 2. 38ers M6 012 10.0 points Which of the following is not true of alkali metals? 1. They have one electron in their highest energy shell. (0) They form strong acids upon reacting with water. 3. They are not found in their elemental form in nature. 4. rFhey are highly reactive toward halo— gens. 5. They are always assigned a +1 oxidation state in compounds. 013 10.0 points If a certain reaction has a pre—«exponential factor (A) of 107 and an activation energy (Ea) of 1.23 k3 ' moi—3“ , What is the magni~ tnde of the rate constant for the reaction at room temperature? 1. is m 6.1 x 107 2. k m 1.6 x 106 a. k e 1.0 X 107 Q) k m 6.1 x 106 5.k=1.6><107 014 10.0 points Consider the reaction mechanism below: Step Reaction 1 CH3Br We CH3+ + B}:— 2 (313+ —i~ HCl ———+ CH301+ H0" 3 131*“ + Br” W as; overall CH3B1‘ + HOE ————> Cchl + HBr If step 3 is the slow step what is the rate law? 1. [Cl‘lgBrl @iCHsBri - [H01] - [01213004- 3. [OH3Br] . [HOE] . [RH—1 4. [013131313] . [HOE] 015 10.0 points Consider the reaction mechanism below: Step Reaction 1 N02+F2-~>N02F+F 2 N02 + F m» NOgF overall ZNOQ + F2 me ZNOQF Which species is a catalyst and which is an intermediate, respectively? 1. N02, N02 2. NOgF, F 3. none, N021? ® nonea F 016 10.0 points What is the name of the following molecule? Version 155 m Exam 3 - Laurie W (52390) 4 CH3 H30 OH e113 fl’: 2—methyi—3~pentanone 2. 2»methyl—3—pentar1ai ,3? 2—methyl—3—hexanoi ,4’. 1,2 dimethyl-Q‘butanol 2«methyl—3~pentanol 017 10.0 points Which of the following gemstones was used for fireproofing until it was discovered to be a p tent carcinogen? asbestos 2. talc 3. diamond 4. quartz 018 10.0 points Consider the balanced reaction below: X "i“ 2 HQO <m-> H2 + X(OH)2 The species ’X’ would be which of the follow— ing? 1. a halogen 2. a pnictogen 3. an alkali metal @ an alkaline earth metal 019 10.0 points What is the activation energy for the for» ward reaction in the diagram beiow? E (kJ 11101—1) sh CD 0.3 C) N) O >—= CD Reaction Coordinate 1. 5.0 kJ . moi“E .175 kJ - moi—1 3. 25.0 k3 11101“: 4. 37.5 kJ - moi“l 5. 20.0 kJ -mol"1 6. 12.5 M . molwl 020 10.0 points Which of the following is not a way to fix nitrogen? 1. Rely on atmospheric reactions caused by lightning. 2. Use the Haber process to manufacture NH3. 3. Rely on soil bacteria. @ Pass nitrogen compounds over / through a catalytic converter. 021 10.0 points Polysaccharides (polymerized sugars) are formed from what kind of bonds? /1¢?' phosphine linkages /2". imide linkages Version 155 ~ Exam 3 m Laude — (52390) 5 (:3) ether linkages fl amide linkages 5. ester linkages 022 10.0 points Collision theory states that 1. transition states are high energy. 2. ali reactions become faster at lower tem— perature. (’3? molecules must collide with the proper orientation in order to react. 4. reactions are irreversible. 023 10.0 points Which of the following monomers cannot undergo addition polymerization? H20 2 CH2 ethane chwd chloroethene 1120 V CH3 prgp’ene F F tetrafiuoroethene /1/. propene C2) chloroetherre 3. tetrafluoroethene A‘. All 4 can undergo addition poiyrneriza— tion /5’. etheue 024 10.0 points What is the name of the following molecule? H30 ’ o 6 CH3 fr @ethyl butanoate 2. 1—butoxyethane 3. butyl ethanoate ff. 1-ethoxybutane 5. l—ethoxybut—l—one 025 100 points Which of the foliowing is/ are true of cat— alytic converters found in automobile exhaust systems? I) They reduce carbon monoxide. II) They reduce nitrogen oxides. 111) They oxidize incomplete combustion products. 1. 11 only 2. I only 3. 111 only 4. I and II ® 11 and III 6. I, II and ill '?. I and Ill 026 10.0 points Version 155 w Exam 3 — Laude M (52390) 6 Which of carbon’s allotropes conduct elec“ 028 10.0 points tricity'? I) graphite The overall reaction: 11) fullerene HI) diamond 3102(9) + 00(9) we 002(9)/+ N00) has an efix‘zflcafiy determined/rate law with 1. III only a single bi lecular collisim’i that doesn’t in" volve co. If 2 2.0 X e M4 -s"1, [N02] 2.1,IIandIII m 0.3 M and g] #0.} M, What is the observed rate? 3. I only a 1. 0.18M-s‘1 @I and II only \‘j’ “'0 M Q \ $2.6.0M-s” \..o-“““ E 5. I and III 3. 1.8 6. II only 4, 4. 01:6 M - SW1 7. Hand III 029 10.0 points 027 10.0 points What are the products of the Hall process? 1. AlgOg Based on the plot below, what are the units of the rate constant for this reaction? 2. A1203 and 002 ® A1 and co;3 4. 002 630 10.0 points [A] (M) Consider the reaction below: 1 Cgraphite(8) ”l” F2(9) + ”2'02(9) ""* CFEOLQ) Which of the following is a correct rate ex- pression? v u u A .. . time (mm) 1. rate 2 [Ciiphlte] __ A [Cgraphite] 1/- s‘1 2. rate ___ nWAt 2Al02] E?) M min—1" @raie 3 ___ At A CF 0 VMwl-sml 4 rafezm [A132 1 4 M—1 mm” 5. rate — ABM] ...
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