- What is the geometry of the hydronium ion, H 3 O+?
Answer: C
- Which one of the following is a nonpolar molecule with one or more polar bonds?
A. HBr
B. ClBeCl
C. HH
D. HOH
E. KCl
Answer: B
A.
B.
C.
D.
E. Compound is ionic,
The Cl atom is more electronegative than the Be atom, resulting in a polar bond. However, be-
cause the molecule is linear and the two ends are identical, the overall molecule is nonpolar.
- How many total sigma bonds are in the benzene molecule, C 6 H 6?
A. 6
B. 9
C. 12
D. 14
E. 18
Answer: C
All single bonds are sigma (σ) in nature. Double bonds contain one sigma bond and one pi (π)
bond. Triple bonds contain one sigma bond and two pi (π)bonds.
Cl
−
K
+
O
H H
HH
Cl Be Cl
H Br
H O H
H
+
Covalent Bonding