MC, Chem1B, Sp 09, Lec ExamFinal                         Name___________________________________
Read the questions carefully to understand it, before answering on the question paper. Transfer the answer to scantron after you are sure of your answer. No outside paper is allowed. Use the reverse side of your answer paper as scratch. 

MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question.
1) The kinetics of the reaction below were studied and it was determined that the reaction rate increased by a factor of 9 when the concentration of B was tripled. The reaction is __________ order in B. 

	A  +  B   →  P
	1) _________

A) zero	B) first	C) second	D) third	E) one-half 

The data in the table below were obtained for the reaction:

	A  +  B  →  P 

2) The order of the reaction in B is __________.	2) _________
A) 1	B) 2	C) 3	D) 4	E) 0 

3) The reaction below is first order in []:

	2 (l)  →  2O (l)  +   (g) 

A solution originally at 0.600 M  is found to be 0.075 M after 54 min. The half-life for this reaction is __________ min.	3) _________

A) 18	B) 54 	C) 14	D) 28	E) 6.8

4) The value of  for the equilibrium 

	 (g)  +   (g)    2 HI (g) 

is 794 at 25 °C. At this temperature, what is the value of  for the equilibrium below?

	HI (g)    1/2  (g)  +  1/2  (g)
	4) _________

A) 28	B) 397	C) 1588	D) 0.0013 	E) 0.035

5)  = 0.0198 at 721 K for the reaction

	 2HI (g)     (g)  +   (g) 

In a particular experiment, the partial pressures of  and  at equilibrium are 0.710 and 0.888 atm, respectively. The partial pressure of HI is __________ atm.	5) _________

A) 1.98	B) 0.389	C) 5.64	D) 7.87	E) 0.125

6) Calculate the concentration (in M) of hydronium ions in a solution at 25.0 °C with a pOH of 4.223.	6) _________

A) 5.98 × 
B) 1.67 × 
C) 1.00 × 
D) 5.99 × 
E) 1.67 × 

7) A 25.0 mL sample of 0.150 M  nitrous acid is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point?  The  of  nitrous acid is 4.50 × 10-4.	7) _________

A) 10.65	B) 8.11	C) 7.00	D) 10.35	E) 3.35

8) The  for Zn is 5.0 × . Determine the molar solubility of in a buffer solution with a pH of 11.5.	8) _________

A) 1.2 × 
B) 5.0 × 
C) 1.6 × 
D) 5.0 × 
E) 5.0 × 

9) Which of the following could be added to a solution of acetic acid to prepare a buffer?
	sodium acetate     sodium hydroxide     nitric acid     hydrofluoric acid
	9) _________

A) hydrofluoric acid or nitric acid
B) sodium acetate or sodium hydroxide
C) sodium hydroxide only
D) sodium acetate only
E) nitric acid only

10) Which transformation could take place at the anode of an electrochemical cell?	10) ________
A) C →  
B) As  →  As
C)   →  
D) V  →  V
E) NO  →  N

11) Consider the reaction: 

	N (g)  +  HCl (g)   →  NCl (s)
Given the following table of thermodynamic data at 298 oK:

	The value of K for the reaction at 25 °C is __________.	11) ________

A) 8.4 × 
B) 1.1 × 
C) 9.3 × 
D) 1.4  × 
E) 150

12) The standard emf for the cell using the overall cell reaction below is +2.20 V:

	2Al (s) +  (s)  →   (aq) +  (aq)

The emf generated by the cell when [] =  4.5 ×  M and [] =  0.15 M is 	12) ________

A) 2.23	B) 2.30	C) 2.39	D) 2.20	E) 2.10

13) Consider an electrochemical cell based on the reaction:
	2 (aq)  +  Sn (s)  →   (aq)  +   (g)
Which of the following actions would not change the measured cell potential?	13) ________

A) lowering the pH in the cathode compartment
B) increasing the tin (II) ion concentration in the anode compartment
C) addition of more tin metal to the anode compartment
D) increasing the pressure of hydrogen gas in the cathode compartment
E) Any of the above will change the measured cell potential.

14) The standard cell potential () of the reaction below is +0.126 V. The value of  for the reaction is __________ kJ/mol. 
	Pb (s)  +  2 (aq)  →   (aq)  +  (g)
	14) ________

A) -24	B) +24	C) -12	D) +12	E) -50

	Table 20.2
	
15) Which of the following reactions will occur spontaneously as written?	15) ________
A)  (aq)  +   (s)   →   (aq)  +   (aq)
B) 2 (aq) + 3 (aq)  →  3 (aq)  +  2Cr (s)
C) 2Cr (s)  +  3 (s)  →  3Fe (s)  +  2 (aq) 
D) 3 (aq)  +   (aq)  →  Cr (s)  +  3 (aq)
E)  (aq)  +   (s)  →    (aq)  +  Fe (s)

16) How many seconds are required to produce 1.0 g of silver metal by the electrolysis of a AgN solution using a current of 30 amps __________ ?	16) ________

A) 30	B) 60	C) 3.2 × 	D) 2.7 × 	E) 3.7 × 

17) Of the following processes, which one changes the atomic number?	17) ________
A) electron capture
B) alpha emission
C) positron emission
D) beta emission
E) All of these processes change the atomic numbers.

18) If we start with 1.000 g of cobalt-60,  0.675 g will remain after  3.00 yr. This means that the  of  is __________ yr.	18) ________

A) 3.08	B) 2.03	C) 4.44	D) 7.65	E) 5.30

19) Which one of the following can be done to shorten the half-life of the radioactive decay of uranium-238?	19) ________

A) freeze it
B) convert it to 
C) heat it
D) oxidize it to the +2 oxidation state
E) none of the above

20) Strontium-90 is a byproduct in nuclear reactors fueled by the radioisotope uranium-235. The  of  is 28.8 yr. What percentage of a strontium-90 sample remains after  70.0 yr?	20) ________

A) 2.43	B) 8.80	C) 18.6	D) 41.1	E) 66.3

21) Carbon-11 decays by positron emission:

	C  →  B + e

The decay occurs with a release of 2.87 ×  J per mole of carbon-11. When  4.00 g of  undergoes this radioactive decay, __________ g of mass is converted to energy.	21) ________

A) 3.48 × 105 
B) 1.28 × 10-2 
C) 1.16 × 10-3 
D) 1.16 × 10-6 
E) 8.62 × 102 

22) A rock contains  0.313 mg of lead-206 for each milligram of uranium-238. The  of for the decay of uranium-238 to lead-206 is 4.5 ×  yr. The rock was formed __________ yr ago.	22) ________

A) 1.08 × 109 
B) 1.39 × 109 
C) 2.00 × 109 
D) 1.41 × 109 
E) 1.56 × 109 

23) The mass of a proton is 1.00728 amu and that of a neutron is 1.00867 amu. What is the mass defect (in amu) of a Co nucleus? (The mass of a cobalt-60 nucleus is 59.9338 amu.) __________.?	23) ________

A) 27.7830	B) 0.4827	C) 0.0662	D) 0.5489	E) 0.5405

24) How many d electrons are in the cobalt ion of [Co(CN] __________ ?	24) ________
A) 3	B) 4	C) 6	D) 7	E) 5

25) During the formation of a coordination compound, the metal acts as a __________.	25) ________
A) Br∅nsted acid
B) Br∅nsted base
C) Lewis acid
D) Lewis base
E) Arrhenius acid

26) How many isomers exist for the octahedral complex ion   __________?	26) ________
A) 1	B) 2	C) 3	D) 4	E) 5

27) Metals with __________ electron configurations characteristically form diamagnetic, square planar complexes.	27) ________

A) 	B) 	C) 	D) 	E) 

28) Based on electron configuration, which is most likely colorless?	28) ________
A) 
B) 
C) 
D) 
E) 

29) Based on the crystal-field strengths  <  < O < N < NN, which octahedral Ti(III) complex below has its d-d electronic transition at shortest wavelength?	29) ________

A) 
B) 
C) 
D) 
E) 

30) Which one of the following ions cannot form both a high spin and a low spin octahedral complex ion?	30) ________

A) 	B) 	C) 	D) 	E) 

31) Which one of the following could be a cyclic alkane?	31) ________
A) 	B) 	C) 	D) 	E) 

32) Hybridization of the carbon atom indicated by (*) in -*-, *CH, and -*C≡CH is __________,__________, and __________,respectively.	32) ________

A) sp, , 
B) , , sp
C) , , sp
D) , sp, 
E) sp, , 

33) How many structural isomers of heptane exist  __________?	33) ________
A) 2	B) 4	C) 6	D) 8	E) 10

34) The melting and boiling points of hydrocarbons are determined by __________.	34) ________
A) ion-dipole attraction
B) ionic bonding
C) hydrogen bonding
D) dipole-dipole attraction
E) London forces

35) The molecular geometry of each carbon atom in an alkane is __________.	35) ________
A) square planar
B) trigonal pyramidal
C) tetrahedral
D) trigonal planar
E) octahedral

36) __________ could be the formula of an alkene.	36) ________
A) 	B) 	C) C	D) 	E) 

37) The general formula for an ether is __________.	37) ________
A) RCOR'
B) ROH
C) ROR'
D) RCOH
E) RCOOH

TRUE/FALSE.  Circle 'A' if the statement is true and 'B' if the statement is false.
38) Units of the rate constant of a reaction are independent of the overall reaction order. 	38) ________

39) At constant temperature, reducing the volume of a gaseous equilibrium mixture causes the reaction to shift in the direction that increases the number of moles of gas in the system.	39) ________

40) The solubility product of a compound is numerically equal to the product of the concentration of the ions involved in the equilibrium, each multiplied by its coefficient in the equilibrium reaction.	40) ________

41) The quantity of energy gained by a system equals the quantity of energy gained by its surroundings.	41) ________

42) When the cell potential is negative in a voltaic cell the cell reaction will not proceed spontaneously. 	42) ________

43) Gamma  radiation  only changes the atomic number but not the mass number of a nucleus. 	43) ________

44) Positron emission causes a decrease of one in the atomic number.	44) ________

45) The energy produced by the sun is the result of nuclear fusion.	45) ________

1) C
2) E
3) A
4) E
5) C
6) B
7) B
8) D
9) B
10) E
11) C
12) B
13) C
14) A
15) C
16) A
17) E
18) E
19) E
20) C
21) C
22) C
23) D
24) C
25) D
26) B
27) C
28) A
29) A
30) C
31) C
32) B
33) D
34) E
35) C
36) D
37) C
38) FALSE
39) FALSE
40) FALSE
41) FALSE
42) TRUE
43) FALSE
44) TRUE
45) TRUE