1. In quantum mechanics a node (nodal surface or plane) is:
f f f f f f f f f
A) a place where is negative.
f f f f f
B) a place where is positive.
f f f f f
C) a place where = 0.
f f f f f
D) a place where 2 is large.
f f f f f
E) a place where 2 is negative.
f f f f f
Ans: C
f f
Topic: Atomic Orbitals, Molecular Orbitals
f f f f
2. When the 1s orbitals of two hydrogen atoms combine to form a hydrogen molecule,
f f f f f f f f f f f f f
how many molecular orbitals are formed?
f f f f f f
A) 1 f
B) 2 f
C) 3 f
D) 4 f
E) 5 f
Ans: B f
f Topic: Atomic
f
Orbitals
f
3. Which principle(s) or rule must be used to determine the correct electronic configuration
f f f f f f f f f f f f
for carbon in its ground state?
f f f f f f
A) Aufbau Principle f
B) Hund's Rule f
C) Pauli Exclusion Principle f f
D) (A) and (B) only f f f
E) All three f
Ans: E f f
1
, Chapter 1 f
Topic: Atomic Orbitals, Bonding
f f f
4. What point on the potential energy diagram below represents the most stable state for
f f f f f f f f f f f f f
the hydrogen molecule?
f f f
A) I
B) II
C) III
D) IV
E) V
Ans: C f f
Topic: Atomic Orbitals, Molecular Orbitals
f f f f
5. According to molecular orbital theory, which molecule could not exist?
f f f f f f f f f
A) H2
B) He2
C) Li2
D) F2
E) N2
Ans: B f f
Topic: Atomic Orbitals, Molecular Orbitals
f f f f
6. When the ls orbitals of two hydrogen atoms combine to form a hydrogen molecule,
f f f f f f f f f f f f f
which molecular orbitals are formed?
f f f f f
A) One bonding molecular orbital only
f f f f
B) Two bonding molecular orbitals
f f f
C) One bonding molecular orbital and one antibonding molecular orbital
f f f f f f f f
D) Two antibonding molecular orbitals
f f f
E) Three bonding molecular orbitals
f f f
Ans: C
f f
2
, Chapter 1 f
Topic: Atomic Orbitals, Hybridization
f f f
7. The following electron configuration represents
f f f f f .
1s 2sp3 2sp3 2sp3 2sp3
A) the ground state of boron.
f f f f
B) the sp3 hybridized state of carbon.
f f f f f
C) the sp3 hybridized state of nitrogen.
f f f f f
D) the ground state of carbon.
f f f f
E) an excited state of carbon.
f f f f
Ans: C
f f
Topic: Atomic Orbitals, Molecular Orbitals
f f f f
8. According to molecular orbital theory, in the case of a carbon-carbon double bond, the
f f f f f f f f f f f f f
carbon-carbon bonding electrons of higher energy occupy this molecular orbital.
f f f f f f f f f f
A) bonding MO
f f
B) bonding MO
f f
C) * antibonding MO
f f
D) * antibonding MO
f f
E) * bonding MO
f f
Ans: B
f f
Topic: Atomic Orbitals, Hybridization
f f f
9. Identify the atomic orbitals in the C-C sigma bond in ethyne.
f f f f f f f f f f
A) (2sp2, 2sp2) f
B) (2sp3, 2sp3) f
C) (2sp, 2sp) f
D) (2p, 2p) f
E) (2sp, 1s) f
Ans: C
f f f
3
, Chapter 1 f
Topic: Lewis Structures, Formal Charges
f f f f
10. Listed below are electron dot formulas for several simple molecules and ions. All valence
f f f f f f f f f f f f f
electrons are shown; however, electrical charges have been omitted deliberately.
f f f f f f f f f f
H H H H
.. .. .. .. f
H : Be : H
f f f f H:B:H
f f f f H:N:H
f f f f H:N:H
f f f f H:O:H
f f f f
.. .. .. .. f
H H
I II III IV V
Which of the structures actually bear(s) a positive charge?
f f f f f f f f
A) I
B) II
C) III
D) III & V f f
E) IV & V f f
Ans: E f f
Topic: Lewis Structures, Formal Charges
f f f f
11. What is.t.he formal charge on oxygen in the following structure?
f f f f f f f f f
H3C O CH3
CH3
f
A) f +2
B) f +1
C) 0
D) -1
E) -2
Ans: B f f
4
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