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1) Resonance structures differ by ________.
A) number and placement of electrons
B) number of electrons only
C) placement of atoms only
D) number of atoms only
E) placement of electrons only
2) The ion NO- has ________ valence electrons.
A) 15
B) 14
C) 16
D) 10
E) 12
3) The oxidation number of N in HNO2 is ________.
A) +1
B) +2
C) +3
D) +4
E) +5
4) The molecular geometry of the CS2 molecule is ________.
A) linear
B) bent
C) tetrahedral
D) trigonal planar
E) T-shaped
5) An aqueous solution contains 0.10 M HNO3. The solution is ________.
A) acidic
B) basic
C) neutral
D) very dilute
E) highly colored
6) A 0.100 m solution of which one of the following solutes will have the lowest vapor
pressure?
A) KClO4
B) Ca(ClO4)2
C) Al(ClO4)3
D) sucrose
E) NaCl
7) The electron-pair geometry and molecular geometry of XeF2 are ________ and
________, respectively.
A) trigonal bipyramidal; bent
B) trigonal bipyramidal; linear
C) trigonal bipyramidal; bent
D) octahedral; linear
E) octahedral; bent
8) Calculate the number of grams of solute in 500.0 mL of 0.159 M KOH.
A) 176
B) 1.42
C) 4.46 x 103
D) 4.46
E) 1.42 x 10-3
9) Which of the following molecules has hydrogen bonding as its only intermolecular
force?
A) NH3
B) H2O
C) C3H7OH
D) HOCH2CH2OH
E) None, all of the above exhibit dispersion forces.
10) Each p-subshell can accommodate a maximum of ________ electrons.
A) 6
B) 2
C) 10
D) 3
E) 5
11) The Henderson-Hasselbalch equation is ________.
A) [H+] = Ka +
B) pH = pKa - log
C) pH = pKa + log
D) pH = pKa + log
E) pH = log
12) Based on molecular orbital theory, the bond order of the Be-Be bond in the Be2
molecule is ________.
A) 0
B) 1
C) 2
D) 3
E) 4
13) The element X has three naturally occurring isotopes. The masses (amu) and %
abundances of the isotopes are given in the table below. The average atomic mass of the
element is ________ amu.
A) 33.333
B) 220.40
C) 220.24
D) 219.00
E) 219.67
14) How many p-orbitals are occupied in a O atom?
A) 5
B) 6
C) 0
D) 3
E) 1
