Chem 51A Practice Problems 1
Fall 2015
1. Deuteriun (D) and tritium (T) are isotopes of hydrogen with mass numbers of 2 and 3,
respectively. For each isotope, give the following information: (1) the number of
protons; (2) the number of neutrons; (3) the number of electrons in the neutral atom; and
(4) the number of protons, neutrons and electrons in the positively charged atom. Why is
H+ called a proton? Can D+ and T+ be called protons?
2. Identify the type of bonding as either ionic, covalent, or both in each of the following
structures:
a) KF
b) CH3CHOH
+
c) NH4Br
3. Add formal charges to the atoms in the following structures, then draw skeletal structures
of each. Lone pairs are not required on skeletal structures, but formal charges are always
required!
O
a.
H
C
C
CH3
b.
H2C
N
N
c.
H
C
H
4. Draw Lewis structures for the following compounds.
a. vinyl chloride, H2C=CHCl
b. formic acid, HCO2H (also abbreviated HCOOH)
c. methoxymethyl cation, CH3OCH2
d.
CH2CO2CH3
_
C
H
C
H
H