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1) At elevated temperatures, nitrogen dioxide decomposes to nitrogen oxide and
oxygen:
NO2 (g) --> NO (g) + O2 (g)
The reaction is second order in NO2 with a rate constant of 0.543 M-1s-1at 300 oC. If
the initial [NO2] is 0.260 M, it will take ________ s for the concentration to drop to
0.075 M.
A) 3.34
B) 0.0880
C) 2.29
D) 0.299
E) 17.5
2) The bond order of any molecule containing equal numbers of bonding and
antibonding electrons is ________.
A) 0
B) 1
C) 2
D) 3
E) 1/2
3) In general, the vapor pressure of a substance increases as ________ increases.
A) surface tension
B) molecular weight
C) hydrogen bonding
D) viscosity
E) temperature
4) This reaction is an e x ample of ________.
Ca --> K + _____
A) alpha decay
B) beta decay
C) positron decay
D) electron capture
E) gamma emission
5) Calculate the concentration (in M) of hydronium ions in a solution at 25.0 oC with a
pOH of 4.223.
A) 5.98 x 10-5
B) 1.67 x 10-10
C) 1.67 x 104
D) 5.99 x 10-19
E) 1.00 x 10-7
6) How many grams of oxygen are in 56 g of C2H2O2?
A) 11
B) 19
C) 26
D) 31
E) 49
7) What are the products of the reaction of PCl5 (g) and water?
A) phosphoric acid and phosphorous acid
B) elemental phosphorus and hydrochloric acid
C) phosphoric acid and chlorine gas
D) elemental phosphorus and chlorine gas
E) phosphoric acid and hydrochloric acid
8) According to the phase diagram shown above, the normal melting point of this
substance is ________ oC.
A) -13
B) 10
C) 29
D) 38
E) 0
9) An aqueous solution contains 0.150 M HCl at 25.0 oC. The pH of the solution is
________.
A) 0.150
B) 1.00
C) 13.00
D) 7.00
E) 0.82
10) Which one of the following substances has three unpaired d electrons?
A) [Zn(NH3)4]2+
B) [V(H2O)6]4+
C) [Ag(NH3)2]+
D) [Cu(NH3)4]2+
E) [Cr(CN)6]3-
11) The decomposition of N2O5 in solution in carbon tetrachloride proceeds via the
reaction
2N2O5 (soln) --> 4NO2 (soln) + O2 (soln)
The reaction is first order and has a rate constant of 4.82 x 10-3 s-1 at 64 oC. The rate
law for the reaction is rate = ________.
A) k[N2O5]2
B) k
C) k[N2O5]
D) k
E) 2k[N2O5]
12) Of the following elements, ________ has the most negative electron affinity.
A) O
B) K
C) B
D) Na
E) S
13) A solution containing which one of the following pairs of substances will be a
buffer solution?
A) NaI, HI
B) KBr, HBr
C) RbCl, HCl
D) CsF, HF
E) none of the above
14) The density of lead is 11.4 g/cm3. The mass of a lead ball with a radius of 0.50 mm
is ________ g.
( = 3.1416; Vsphere = 4r3/3)
A) 6.0
B) 4.6 X 10-2
C) 4.6 X 10-5
D) 6.0 X 10-3
E) 4.6
15) Of the following, the entropy of gaseous ________ is the largest at 25 oC and 1 atm.
A) C3H8
B) C3H6
C) C3H4
D) C2H6
E)
16) A 30.5 gram sample of glucose (C6H12O6) contains ________ mol of glucose.
A) 0.424
B) 0.169
C) 5.90
D) 2.36
E) 0.136
17) A ________ covalent bond between the same two atoms is the longest.
A) single
B) double
C) triple
D) strong
E) They are all the same length.
18) The hybrid orbital set used by the central atom in ClO2
- is ________.
A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2
19) The internal energy can be increased by ________.
(a) transferring heat from the surroundings to the system
(b) transferring heat from the system to the surroundings
(c) doing work on the system
A) a only
B) b only
C) c only
D) a and c
E) b and c
