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20 MCQs with Answers - General Chemistry II | CHEM 1120, Exams of Chemistry

Material Type: Exam; Class: General Chemistry II; Subject: Chemistry; University: Roane State Community College; Term: Spring 2003;

Typology: Exams

Pre 2010

Uploaded on 08/18/2009

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CHEM 1120 test 3 - spring 2003 Page 1
Do not write on this test. Write your name on the answer sheet and circle the letter for the
correct answers.
E = E
F
! (0.0592/n)log
10
Q
1. What is the value for the equilibrium constant for the following reaction?
Cu(OH)
2
+ 4NH
3
º Cu(NH
3
)
4
2+
+ 2OH
!
K
sp
(Cu(OH)
2
) = 1.6 × 10
-19
K
d
(Cu(NH
3
)
4
2+
) = 8.3 × 10
!13
a. 1.3 × 10
!31
b. 5.3 × 10
6
c. 7.7 × 10
30
d. 1.9 × 10
!7
e. 3.1 × 10
!21
2. What is the rate expression for the following set of reactions?
step 1: NO
2
Br(g) ! NO
2
(g) + Br(g) slow step
step 2: NO
2
Br(g) + Br(g) ! NO
2
(g) + Br
2
(g) fast step
overall: 2 NO
2
Br(g) ! 2 NO
2
(g) + Br
2
(g)
a. Rate = k(P
NO2Br
)
2
b. Rate = k(P
NO2Br
)
2
P
Br
c. Rate = kP
NO2Br
P
Br
d. Rate = kP
NO2Br
e. Rate = k(P
NO2Br
)
2
(P
Br
)
-1
3. What is the rate expression for the following set of reactions?
step 1: 2NO
2
(g) º NO
3
(g) + NO(g) fast
step 2: NO
3
(g) + CO(g) ! NO
2
(g) + CO
2
(g) slow
overall: NO
2
(g) + CO(g) ! NO(g) + CO
2
(g)
a. Rate = k(P
NO2
)
2
b. Rate = k(P
NO2
)
2
P
CO
(P
NO
)
-1
c. Rate = kP
NO2
P
CO
P
NO
d. Rate = kP
NO2
P
CO
e. Rate = kP
NO2
pf3
pf4
pf5

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Do not write on this test. Write your name on the answer sheet and circle the letter for the correct answers.

E = E F^! (0.0592/n)log 10 Q

  1. What is the value for the equilibrium constant for the following reaction? Cu(OH) 2 + 4NH 3 º Cu(NH 3 ) 4 2+^ + 2OH! Ksp(Cu(OH) 2 ) = 1.6 × 10- Kd(Cu(NH 3 ) 4 2+) = 8.3 × 10!^13

a. 1.3 × 10!^31 b. 5.3 × 10^6 c. 7.7 × 10^30 d. 1.9 × 10!^7 e. 3.1 × 10!^21

  1. What is the rate expression for the following set of reactions?

step 1: NO 2 Br(g)! NO 2 (g) + Br(g) slow step step 2: NO 2 Br(g) + Br(g)! NO 2 (g) + Br 2 (g) fast step overall: 2 NO 2 Br(g)! 2 NO 2 (g) + Br 2 (g)

a. Rate = k(PNO2Br)^2 b. Rate = k(PNO2Br)^2 PBr c. Rate = kPNO2BrPBr d. Rate = kPNO2Br e. Rate = k(PNO2Br)^2 (PBr)-

  1. What is the rate expression for the following set of reactions?

step 1: 2NO 2 (g) º NO 3 (g) + NO(g) fast step 2: NO 3 (g) + CO(g)! NO 2 (g) + CO 2 (g) slow overall: NO 2 (g) + CO(g)! NO(g) + CO 2 (g)

a. Rate = k(PNO2)^2 b. Rate = k(PNO2)^2 PCO(PNO)- c. Rate = kPNO2PCOPNO d. Rate = kPNO2PCO e. Rate = kPNO

  1. The half life of tritium is 12.32 yr. How long would it take for 67% of tritium to decay away? (ln 2 = 0.69315)

a. 19.71 yr. b. 7.10 yr. c. 11.91 yr. d. 74.7 yr. e. 62.1 yr.

  1. In the following reaction, initial data in the table below was obtained.

A + B! C + D

Rate /M s-1^ [A] [B] 1.0 × 10-2^ 0.10 0. 2.0 × 10-2^ 0.20 0. 4.0 × 10-2^ 0.20 0. 2.0 × 10-2^ 0.10 0.

What are the reaction orders for A and B?

a. A: 0th^ B: 1st b. A: 1st^ B: 0th c. A: 2nd^ B: 0th d. A: 1st^ B: 2nd e. A: 1st^ B: 1st

  1. The following data was obtained in the bleaching of a dye

time /min Adsorbance 0.00 0. 1.00 0. 2.00 0. 3.00 0. 4.00 0. What is the order of the reaction?

a. 0th^ order b. ½ order c. 1st^ order d. 2nd^ order e. 3rd^ order

a. !3.64 V b. +3.28 V c. !2.46 V d. +2.10 V e. +3.64 V

  1. What voltage would one obtain from the following galvanic cell?

Zn | Zn2+^ (2.0 M) || Cu2+(0.010 M) | Cu

a. 1.1047 V b. 1.1728 V c. 1.0366 V d. 0.9684 V e. 0.9479 V

  1. Which of the following compounds has a carboxylic acid group?

a. CH 3 CHO b. CH 3 CH 2 OH c. CH 3 OCH 3 d. CH 3 COOH e. CH 3 COCH 3

  1. Which of the following types of compounds are weak bases?

a. a primary amine b. a carboxylic acid c. an alcohol d. an ester e. a ketone

  1. What is the product of the reaction (in the presence of a catalyst such as sulfuric acid) between an amine and a carboxylic acid?

a. an ester b. a carboxylic acid c. an ether d. an amide e. an aldehyde

  1. What is the product for the following reaction?

CH 3 CH=CH 2 + Br 2!?

a. CH 3 CH 2 CHBr 2 b. CH 3 CH 3 + CH 2 Br 2 c. CH 2 CH 2 + CH 2 Br 2 d. CH 3 CHBrCH 2 Br e. CH 4 + BrHC=CHBr

  1. Which one of the following is the monomer for polyethylene?

a. CH 2 CH 2 (ethene) b. CH 2 C(CH 3 )CHCH 2 (isoprene) c. CH 3 CH 3 (ethane) d. CH(C 6 H 5 )CH 2 (styrene) e. HC/CH (ethyne)

  1. Which of the following is a weak acid?

a. C 6 H 5 NH 2 b. CH 3 CH 2 OCH 2 CH 3 c. C 6 H 5 COOH d. CH 3 CH 2 OH e. CH 3 COOCH 3

KEY:

1.d

2.d

3.b

4.a

5.e

6.d

7.b

8.a

9.b

10.a

11.e

12.a

13.d

14.c

15.d

16.a

17.d

18.d

19.a

20.c