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exam 1 - ' 1013—231 Exam 1 Version A Name A5? a. You will...

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Unformatted text preview: ' 1013—231 Exam 1 Version A Name A5? a. You will need a #2 pencil to complete the test. b. Enter your student number in the space and fill in the appropriate circles. c. Enter the number 101323101 in the Additional Coded Data space and fill in the appropriate circles. d. Enter your name under Student Name and fill in the appropriate circles. e. Complete the exam by filling the appropriate circles corresponding to the question number . If your identifying information is not filled out correctly on the exam score sheet it will be as if you did not take the exam and you will receive a zero. You may keep the exam questions sheet, but you must turn in the score sheet to get credit. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What is the strongest intermolecular force present in liquid ethanol? 1) g A) dipole-dipole, specifically hydrogen bonding B) ion—ion C) dipole—dipole, but not hydrogen bonding D) ion—dipole E) induced dipole—induced dipole 2) The pKa of CH3COOH is 4.8 and the pKa of HCOOH is 3.8. Given this information, one knows 2) C that . A) HCOOH reacts with HO‘ while CH3COOH does not B) CH3COOH completely ionizes in water C) HCOO‘ is a weaker base than CH3COO“ D) CH3COOH reacts with HO" while HCOOH does not E) HCOOH is a weaker acid than CH3COOH 3) Which representation of butane is the lowest energy conformer? H j H C H 3 H3O CH H CH3 3 H H H A B H30 H CH3 H30 H H CH3 H H A H H H C D A)A B)B C)D D)CandD 4) Which of the following is the electronic configuration of the element Fe? 4) / A) 152 252 2p6 352 3p6 452 4d6 B) 152 252 2p8 352 3p6 452 3d6 C) 152 252 2p6 352 3p8 3d6 D) 152 252 2p6 352 3p6 452 3d6 E) 152 25?- 2p6 352 3p6 452 4P6 5) Which of the following is the most likely electronic structure for C2H2? 5) C A) H_C:C : H B) ® 0 . H—‘CZC—‘H C) H-CEC—H D) H_‘C—’C: H E) H—‘C—C"H 6) What is the conjugate base of CH3NH2? 6) A A) CH3NH— B) CH3NH3+ C) NH4+ D) NHz- 7) What is the product formed from the following acid-base reaction? on CH3OH + :NH3 : A) CH20H + +NHQ, B) CH3OH2+ + ~NH2 C) CH4 + NH20H D) CH3NH2 + H20 E) CH30— + +NH4 8) The conjugate acid of H20 is: A) H3O‘ B) H3O+ C) H3O D) H20+ E) HO‘ 9) The atomic number of boron is 5. The correct electronic configuration of boron is: A) 152253 B) 152252331 C) 1522133 D) 1522522p1 E) 2822p3 10) What are the formal charges on nitrogen and the starred oxygen atom in the following molecule? to: / CH3“N \\ 01 I.* A)N=—1,0=0 B)N=+1,0=—1 C)N=—1,0=-1 D)N=+1,0=O E)N=+1,0=+1 11) Assuming roughly equivalent molecular weights, which of the following would have the highest boiling point? A) an alkyl chloride B) a tertiary amine C) a quaternary ammonium salt D) an ether B) an alcohol 12) What is the CNN bond angle in the compound shown below? NH . / 2 0:2 H3C/ \CH3 A) ~180° E) ~120° B)~90° C)~60° 13)~110° 10) D in ( 13) Which of the following is not a conjugate acid—base pair? 13) C A) H804“, H2804 B) H20, HO‘ C) N03-, N02- D) ‘OH, 02- E) H20, H30"’ lo 14) Which of the following is an sp2 hybridized carbon? 14) A) - CH3 @ B) CH3 8 C) t CH 3 D) A and B E) A, B and C 15) What type of bonding is most important in CH3CH2CH2CH2CH2CH3? 15) E A) hydrogen B) covalent C) ionic D) polar 16) If an acyclic alkane hydrocarbon contains n carbon atoms, how many hydrogen atoms must it also 16) 0 contain? A)2n B)n+2 C)2n+2 D)n E)n—2 17) Give the IUPAC name for the following compound: 17) 5 CH3 Cl A) 1 -chloro—5—methylcyclohexane B) 1—methyl—5-chlorocyclohexane C) 1 —methyl—2—chlorocyclohexane D) 1, 2—chlorornethylcyclohexane E) 1—chloro—2—rnethylcyclohexane 18) Give the IUPAC name for the following structure: 18) g A) 5-(1-methylethyl)octane B) 2-methyl—3—propylheptane C) 3-ethyl-2-methylheptane D) 2—rnethyl—3-ethylheptane E) 4—(1-methylethyl)octane 19) How many unpaired electrons are present in the isolated carbon atom (atomic number = 6)? 19) C A) none B) one C) two D) three E) four 20) Which of the following is the strongest acid? 20) 5 C1 I. OOH IV. OOH 01 Cl 1 11' OOH Cl V. Cl C OOH Cl [[L Cl Cl OOH Cl Cl A) I B) 11 C) 111 D) IV E) V 21) What is the conjugate acid of NH3? 21) A) -NH2 B) -NH C) +NHa D) +NH2 E) +NH4 22) Which of the following elements does this electronic configuration represent? 22) I) 152 252 2p5 A) C B) N C) Al D) F E) O 23) Which of the following describes the most stable conformation of 23) 8 trans— 1 — tert—butyl—3—methylcyclohexane? NCH 3 H l‘H 3C CH? 3 A) Both groups are axial. B) The tert—butyl group is equatorial and the methyl group is axial. C) Both groups are equatorial. D) The tert—butyl group is axial and the methyl group is equatorial. E) none of the above 24) Which of the following is the most soluble in H20? 24) E A) CH3CH2CH3 B) CH3CHO C) CH3OCH3 D) CH3CH2C1 E) CH3CH20H 25) Which of the following is a tertiary amine? 25) A) CH3 CH3"C“‘CH3 NHZ 3) CH3 CH3“C_‘CH3 NH——CH3 C) CH3‘—CH_-CH“CH3 CH3 NH2 D) CH3"N"CH3 CH3 E) CH3’~CH‘“CH2——NH2 CH3 26) The N—H bond in the ammonium ion, NH4+, is formed by the overlap of what two orbitals? 26) a A.)sp2-sp2 B)sp3-sp2 C)sp3—s l))sp2—s E)sp3-sp3 27) Which of the following has the lowest boiling point? 27) C, A) CH3CH2CH2CHCH3 C H 3 B) CH3CH2CH2CH2CH2CI—I2CH3 C) CH3 1 CH3CHCHCH3 CH3 D)CH3CH2CH2CH2CH2CH3 E) CH3CH2CHCH2CH3 I CH3 28) The formal charge on nitrogen in the compound below is . 28) H H “C H‘ :N—H H | | H A)O B)—1 C)-2 13)+1 E)+2 29) Which of the following molecules has a net dipole moment of zero? 29) A) 30) The eclipsed and staggered forms of ethane are said to differ in: 30) E A) molecular formula. B) configuration. C) structure. D) constitution. E) conformation. oz 3. a. a. . 5 w 58., . s. : ., a. ,,,., . 3;: .3333. :3: :02. . . A... .5 a. A... . E .. . E a. .3 S _ E. . . :1: 3.... W _. u .. . c: _,, M 2. .7 m . .3an ,. .32.... 5.23:“. ms... 2.34:3. , :fl .4. 3— . aa— :. E. . 5. Q . ax m .x _ .23.: $3.55., :92. 9k .3 3:... m 3:: 3. m . _. fl am .5 =. M , 3, L. 2 . mm .m E, i m, of,” , 3...; . £1; .375? 32 ~22 . .M .5 PA 3. 33 cm . mm W 3, . , S. , .m $2.2. , "5,5, , we...» .35.? £21.32 5 C . m _ A. x. E . ,c. w M. S: 3. 5.12.... ,. 3.5m. . $.51 2 m c . z : __,._.,,._,.;, o x W ,5 _ 1325+, h. f m. I m.— ol 4» <0 4m <v 5‘ m t. /.,x F _ ....¢%w. .: 33W: 3.,an 323.532 3:... pa .2.» , _ ,, 1, Jt‘zttileaiiiififiiif; 5.22:2... 3:232 Aiufimm 8.5.3... .3 £353. 3 32.. A12 E 32.3%. mg. C. _ 25:53 .3 :23353 2:. . \......::..Eéu ,:\,C:...:2.\.\«:...:Qv.\,. .__.,:.:\\.. SE .n 253...»: I. :c..a:...c,.:. .953”. £5.53 3:935... .3 2.2%.. 325...... 52:. .: tu>__-7,om:o_ u... .3 32:: £2.22. 2:2. . 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Complete the exam by filling the appropriate circles corresponding to the question number. If your identifying information is not filled out correctly on the exam score sheet it will be as if you did not take the exam and you will receive a zero. You may keep the exam questions sheet, but you must turn in the score sheet to get credit. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) b 1) What is the conjugate acid of NH3? A) —NH B) +NH3 C) +NH2 D) mm B) -NH2 2) The pKa of CH3COOH is 4.8 and the pKa of HCOOH is 3.8. Given this information, one knows 2) E that A) HCOOH reacts with HO‘ while CH3COOH does not B) HCOOH is a weaker acid than CH3COOH C) CH3COOH reacts with HO‘ while HCOOH does not D) CH3COOH completely ionizes in water E) HCOO‘ is a weaker base than CH3COO" 3) Give the IUPAC name for the following structure: 3) B A) 2-methyl—3-ethylheptane B) 4—(1 —methylethyl)octane C) 3—ethyl-2—methylheptane D) 5—(1—methylethyl)octane E) 2—methyl—3-propylheptane 4) What is the product formed from the following acid—base reaction? 4) C, CH3OH + :NH3 : A) CH3NH2 + H20 BHEQOH++NH3 C) CH3O- + +NH4 D) CH30H2+ + -NH2 E) CH4 + NH20H 5) Which of the following is an sp2 hybridized carbon? 5) D e A) :CH3 B) - CH3 63 C) CH3 D) B and C E) A, B and C 6) Which of the following is the strongest acid? 6) E 00H IV. Cl OOH Q Cl Cl 1 OOH Cl V. Cl COOH 01 Cl OOH Cl ) II C) III D) IV E) V Cl @3th A)I 7) What are the formal charges on nitrogen and the starred oxygen atom in the following molecule? 7) IO: / CH3—N \\ O: ..* A) N=+1,0=O B)N=—1,0=O C)N=+1,0=+1 D)N=+1,0=—1 E)N=—1,0=-1 8) Which of the following is the electronic configuration of the element Fe? 8) A» A) 152 252 2p6 352 3p6 452 3d6 B) 152 252 2p8 352 SP6 452 3d6 C) Is?- 232 2136 352 3136 452 4p6 D) 152 232 2p6 332 3p6 452 4d6 E) 152 252 2p6 352 3138 3d6 9) Which of the following molecules has a net dipole moment of zero? A) H C l \ / c=c / \ H c1 B) 10) The N —H bond in the ammonium ion, N 114*, is formed by the overlap of what two orbitals? A) sp3—sp2 B) spZ—s C) sp3-sp3 D) sp2-sp2 E) sp3—s 11) What is the CNN bond angle in the compound shown below? . NH: /C\ H30 CH3 A) ~180° B) ~90° C) ~110° D) ~120° E) ~60° 12) How many unpaired electrons are present in the isolated carbon atom (atomic number = 6)? A) none B) one C) two D) three E) four 13) What is the conjugate base of CH3NH2? A) NH4+ B) CH3NHg+ C) NHz- D) CH3NH- 12) C 13) TD 14) If an acyclic alkane hydrocarbon contains n carbon atoms, how many hydrogen atoms must it also 14) Q, contain? A)n+2 B)2n C)2n+2 D)n E)n-2 15) What is the strongest intermolecular force present in liquid ethanol? 15) E A) ion—ion B) dipole—dipole, specifically hydrogen bonding C) induced dipole—induced dipole D) ion—dipole E) dipole—dipole, but not hydrogen bonding 16) Which representation of butane is the lowest energy conformer? 16) A H H J H C H 3 H3O CH H CH3 3 H H H A B H30 H CH3 H3C H H CH3 H H C D A)A B)B C)CandD D)D 17) Which of the following elements does this electronic configuration represent? 17) B 152 252 2p5 A) C B) F C) N D) O E) Al 1m {2 18) Which of the following is the most likely electronic structure for C2H2? A)H*CEC—H 3) H“*C——CZ H C) H'—C—_C‘—H D) H—*C=C: H E) $ 0 C H——C——C‘*H 19) Which of the following is a tertiary amine? A) CH3“CH‘—CH2——NH2 CH3 13) CH3 CH3—~c——CH3 NH2 C) CH3—‘CH—*CH—‘CH3 CH3 NH2 D) CH3‘—N‘—CH3 CH3 E) CH3 CH3—~c——CH3 NH——CH3 20) Which of the following i§__n(_)_t a conjugate acid-base pair? A) H20, HO‘ B) HSO4‘, H2504 C) NO3-, N02- D) —0H, 02— E) 1-120, H30+ 21) Which of the following describes the most stable conformation of trans-1-tert—butyl—B—methylcyclohexane? ',\\CH 3 H c |\CH A) The tert—butyl group is equatorial and the methyl group is axial. B) Both groups are equatorial. C) The tert-butyl group is axial and the methyl group is equatorial. D) Both groups are axial. E) none of the above 22) Assuming roughly equivalent molecular weights, which of the following would have the highest boiling point? A) an alcohol B) an alkyl chloride C) an ether D) a quaternary ammonium salt E) a tertiary amine 23) The formal charge on nitrogen in the compound below is H H H l | l H—c—c=N—H l H A)-2 B)—1 C)0 D)+2 E)+1 24) The eclipsed and staggered forms of ethane are said to differ in: A) constitution. B) molecular formula. C) configuration. D) structure. E) conformation. 20) 22) 22 23) E 24> E 25) What type of bonding is most important in CH3CH2CH2CH2CH2CH3? 25) 2 2 A) polar B) hydrogen C) ionic D) covalent 26) Which of the following has the lowest boiling point? 26) E A) CH3CH2CH2CHCH3 CH3 3) CH3 1 CH3CHCHCH3 CH 3 C) CH3CH2CH2CH2CH2CH2CH3 D) CH3CH2CHCH2CH3 C H 3 E) CH3CH2CH2CH2CH2CH3 27) Which of the following is the most soluble in H20? 27) D A) CH3CH2CH3 B) CH3CHO C) CH3CH2C1 D) CH3CH20H E) CH3OCH3 28) The conjugate acid of H20 is: 28) p A) HO“ B) H3O' C) H3O D) H3O+ E) H20+ 29) The atomic number of boron is 5. The correct electronic configuration of boron is: 29) a A) 1522p3 B) 1s2253 C) 1522522p1 D) 2522p3 E) 152232351 30) Give the TUPAC name for the following compound: 30) & CH3 C! A) 1—chloro-2—Inethylcyclohexane B) 1, 2—chloromethylcyclohexane C) 1—methyl-S—chlorocyclohexane D) 1 —methyl—2—chlorocyclohexane E) 1-chloro—5-methylcyclohexane .bSEcnj 3:232 Aufifiom 3:333 3 1.22373 3 2:: 5:25.» 92.2352 3 magi Eaton—E :2: E 3543?:— 2: .8 1.02 UQUEUFZ:OQU._ MESH: v.3 . .Bv _ 32%: .823 333.. $99.: 62 32 Sr.— mm— !wi: 11.9% icEfi I? I. E. .332. 3.22 2,313. ch Eh. mm a: E .3 . we 3 . .Fxl . 55‘ . w W . . M c_ _ . , . . *4 _ M 53.9.: 7.3232 :3 82 $1.33.”. :3 . 5. W 2 , E W .E w cm S 2 nx 43.3;3153: ,. .45»: m. an m _ _. g M a m 3. Mm . 3., :3 __ cf.» .,_ :53 4. £1; H 3 2 , .2 .5 W on W. 3 , cm L“ mm; 3., .7 S. . $3.3. . 1.15. A. 2:2, M3532“ 3. 5 w m m .— __ f k. t; 2-; E9, . :9: :flhmfliiaz 33.: M 222.. ~ :13: «z m w o ., z H u c.,_ ,_1r 0 w .5 . .c , 21:34.. 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This note was uploaded on 04/07/2008 for the course COS 232 taught by Professor Cody during the Spring '08 term at RIT.

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exam 1 - ' 1013—231 Exam 1 Version A Name A5? a. You will...

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