~:--_(signed)

10 points for perfect answer

~

Ch 115 General Chemistry EXAMINATION III G Q

November 21, 2006

NAME REC. SECTION «2- Q" ./

"1 pledge my honor that I have abided by the Stevens Honor Syste

Questions 1-20, 5 points each; Question 21,

1. The electron configuration of Ti2+ is a [Ar]3d2

) [Ar]4s23d2

dft~ e) none of these

2. Consider the following sets ofquantum numbers. Which set(s) represent(s) impossible combinations?

n 5 'IY\ ~ -- ~,

(Set a/ 1 0 "'¥ +l/'J..'-.3 ~ 0 .. If').~ . Set c 2 1 1 -1/'1.

Set d 3 2 -2 -1/2 --~ "- ~ (

Set 3 1 ;~ -'h- e. Set f 2 0 0 -'lit

3. For the elements Rb, F, and 0, the order of increasing electronegativity is: a) F<Rb<O b . < <0 ~)/Rb < 0 < .-..

~.-/d) 0 < < e) None of these

4. H.OW many Of7f:th£llOwingJ!\O~~S'ossess dipole moments?

1110

I~I .

1-\

f

BH;.--(; 4, ~'~~}' 2 ~' ~_/

~.

~ ~

e) 3

s. Select the best Lewis structure for acetone, eI-hcoClL. ila) ~

H H H 2L.fI I I .'

H-C-':"C-Cz=(j I r" I (,') . ••

•.,! ~ 'j

H H U b b) ·rj.

./ H '--' A<.. I

H-H-Cc::C~O ..... C...;..H -'( ...--..-.. C...,..;.­

0/ff/ H

c) ~ . 0 ·1 .\

, -H :0: H '"". I' Jr, 16 , / H-C-C-,C-H

'-"'" I0 0 I H H

d)

,,' '.~: .. .. ~ H-C~C::::O-C-H

I I.c I' I

H H e) ~

.;-Ij e... .. /I1-~-C-O-H-C-H

,/ I •• I

H H

6. Which of the following is not a valid resonance structure for N3-? , /,'

( I.':"~ arJcorrect

J(~~

~=N-~J c) \

d)

e) --, N N-' '~NIT·~/ ·u­.. ...

i

7. ----...

·Ll_ LL ~LL

l_l \N::~ t ,J-;f J~ S -t-+-" '._-. I·

8. The configuration (cr2s?(cr2s*?(n:2py)l (n:2px) is the molecular orbital description for the ground state of a) Be2

7b) B2fr./'

". d) B2 e 12~1b

Use the following to answer questions 9-11 :

Use the molecules below to answer the next three questions.

"O~./ / h~

C:H6 (I)

9. Which molecule(s) have equivalent C-C bonds throughout the molecule? a) II

all of the above

lIII c) ,I

~n9ne of tIie abo~

10. Which molecule(s) have p orbitals that share an electron pair to create n: bonding? a) II .--­

,b)/):U /' c) I

V (ID allJiftbe iiDQW e) none of the above

/11. Wlllch molecule(s) have at least one carbon atom that is sp hybridized? ~)m

/ b) I c) II d) all the above /!. e) none of the a ove'

12. Name the following: a 0i3

\ /C==C

H C/ \03

a) 2,3.4ie!HefG---ei&:bbutene b) 2,3;>dichlor~ooe c>. 2-:"'clrl:o:r{)-J~.chloro=cis...2 ....butene

t1I 2 -dichloro-trans-2-bt!fene-~ / e) I-chloro..: -met yl-2-chloro-pmp.ene

13. Which of the following has an optical isomer? a)

c~-cL~~ '" I

C~ ~ b) . \~

o " ',-. J f/ ~ \.\-(7- ;(-' t: _. ("---G \-+

ICHf~H I / JW

) If-l,

'NH~/ I 2

CH:fH§-CHi>H I

/ CIi:l

/ d)

'-""

CH3- ~ -OH~ /

CI-fJ

e) none of these

,­

14. Ide~ttt(all the functional groups present in the following organic compound. 1) lteh")oo, 2) ~ld~hyde,.1) acid, ~ 5) etftcf,-{») ester, 7}MtiBt}

(;~ \..f1 kJl

L

.J

o 0 II II

CH 3CO CHzCHzCH

15. In condensation polymerization, a common by-product is: a) aldehyde

~ c) alGo 01 ~thylene

16. The building blocks of all proteins are a) alpha helices. b) tertiary structures.

cfj-alp'tfa amino acid~ ) pleated sheets.

e) none of these (a-d)

17. In order to give someone a "permanent" (permanent waving ofhair), these must be broken and reformed. a) glol;mlar proteins b)aipha amino acids e -f disulfide 1 e d) alpha helices e) pleated sheets

18. How many possible sequences can be made for a polypeptide with six different amino acids? a) 3.6 I

b)/64 1':') r;;, ()..­c 72 f.' 'l 2

d)6 ~ e) none of these (a-d)

19. Consider the reaction 2H2 + 02 ~ 2H20 WJ1at is the ratio of the initial rate of the appearance ofwater to the initial rate of disappearance ofoxygen?

, /)

J \ i.._a) 1:2 / b) 1 : 1

c) 2: 2 .i II,2d) 3: 2

~.

Use the following to answer question 20:

The reaction H2Se03(aq) 6I-(aq) + 4H+(aq) ~ 2h-(aq) + 3H20(l) + Sees) was studied at O°C by the method of initial rates:

[H2Se03]0 [H+]0 [1-]0 Rate (mol/L s) 1.0 x 1<f4 2.0 x 1(r2 2.0 x 10-2 1.66 x 10-7

2.0x1<f4 2.0 x 10--2 2.0 x 10-2 3.33 x 10-7

3.0 x 10-4 2.0 x 10-2 2.0 x 10-2 4.99 x 10-7

1.0 x 1<f4 4.0 x 10-2 2.0 x 10-2 6.66 x 10-7

1.0 x 10-4 1.0 x 10-2 2.0 x 10-2 0.42 x 10-7

1.0 x 10-4 2.0 x 10-2 -4.0 x 10-2 13.4 X 10-7

Lax 1<f4 4.0 x 10-2 4.0 x 10-2 3.36 X 10-7

~. L~~~

U,...::;- ­} . " L\ '1

" ';';;2

21. Oxidation of a primary alcohol results in a(n) and oxidation of a secondary alcohol result .

,l a) ketone, aldehy I) , r c) amiae, earoeK),lic"1tctd d' aldehyde, ketone e -sarboxylic,]&id, amine

-0

I ,

C-c­