1) Which compound would produce a basic aqueous solution?
A) KH
B) H2S
C) C2H6
D) CH3OH
E) H2O
2) Calculate the pOH of a solution at 25.0 oC that contains 1.94 x 10-10 M hydronium
ions.
A) 1.94
B) 4.29
C) 7.00
D) 14.0
E) 9.71
3) What metal is complexed in chlorophyll?
A) iron
B) chromium
C) manganese
D) vanadium
E) magnesium
4) The n = 8 to n = 2 transition in the Bohr hydrogen atom occurs in the ________
region of the electromagnetic spectrum.
A) radio
B) X-ray
C) infrared
D) microwave
E) ultraviolet
5) For the questions that follow, consider the BEST Lewis structures of the following
oxyanions:
There can be four equivalent best resonance structures of ________.
A) (i)
B) (ii)
C) (iii)
D) (iv)
E) (v)
6) Of the molecules below, only ________ is polar.
A) CCl4
B) CH4
C) SeF4
D) SiCl4
7) The change in the internal energy of a system that releases 2,500 J of heat and that
does 7,655 J of work on the surroundings is ________ J.
A) -10,155
B) -5,155
C) -1.91 x 107
D) 10,155
E) 5,155
8) Which one of the following molecules is chiral?
A)
B)
C)
D)
E)
9) The frequency of a photon that has an energy of 8.5 X 10-12 J is ________ s-1.
A) 1.3 X 1022
B) 1.8 X 10-16
C) 2.5 X 10-15
D) 5.4 X 10-8
E) 2.5 X 1015
10) When petroleum is distilled to separate the components by boiling point, the
component with the highest boiling point is called ________.
A) gas
B) gasoline
C) kerosene
D) paraffin
E) asphalt
11) The combustion of propane (C3H8) produces CO2 and H2O:
C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (g)
The reaction of 2.5 mol of O2 with 4.6 mol of C3H8 will produce ________ mol of
H2O.
A) 4.0
B) 3.0
C) 2.5
D) 2.0
E) 1.0
12) A gas mixture of N2 and CO2 has a total pressure of 8.00 atm and contains 12.5 mol
of gas. If the partial pressure of N2 is 3.69 atm, how many moles of CO2 are in the
mixture?
A) 5.77
B) 3.69
C) 4.31
D) 11.0
E) 6.73
13) Which atom has the smallest number of neutrons?
A) carbon-14
B) nitrogen-14
C) oxygen-16
D) fluorine-19
E) neon-20
14) ________ is formed when wood is heated strongly in the absence of air.
A) Buckminsterfullerene
B) Carbon black
C) Sulfur dioxide
D) Coke
E) Charcoal
15) The initial concentration of reactant in a first-order reaction is 0.27 M. The rate
constant for the reaction is 0.75 s-1. What is the concentration (mol/L) of reactant after
1.8 s?
A) 6.0
B) 1.7
C) 0.070
D) 0.012
E) 1.0
16) Which one of the following compounds is insoluble in water?
A) K2SO4
B) Ca(C2H3O2)2
C) MgC2O4
D) ZnCl2
E) Mn(NO3)2
17) S is positive for the reaction ________.
A) 2 Ca (s) + O2 (g) –> 2 CaO (s)
B) 2 KClO3 (s) –> 2KCl (s) + 3 O2 (g)
C) HCl (g) + NH3 (g) –> NH4Cl (s)
D) Pb2+ (aq) + 2Cl– (aq) –> PbCl2 (s)
E) CO2 (g) –> CO2 (s)
18) Under appropriate conditions, nitrogen and hydrogen undergo a combination
reaction to yield ammonia:
N2 (g) + 3H2 (g) → 2NH3 (g)
A 7.1-g sample of N2 requires ________ g of H2 for complete reaction.
A) 0.51
B) 0.76
C) 1.2
D) 1.5
E) 17.2
19) The central atom in a certain molecule has 1 nonbonded electron pairs and 2 bonded
electron pairs in its valence shell. The molecular geometry of this molecule is
________.
A) tetrahedral
B) bent
C) seesaw
D) trigonal bipyrimidal
E) trigonal pyramidal