Practice Problems
1.
2.
Chpt. 7-9 (Bauer)
Which of the following elements has chemical properties similar to those of neon?
(a)
Be
(b)
F
(c)
As
(d)
Xe
Which energy shell contains nine orbitals?
(a)
n=1
(b)
n=2
(c)
n=3
(d)
n=4
3.
What is the number of orbitals in any d subshell?
4.
What is the maximum number of electrons that can occupy any d subshell?
5.
Which of the following electron configurations is an excited state configuration?
(a)
1s22s1
(b)
[He]2s22p3
(c)
[Ar]3d1
(d)
[Ne]3s1
6.
Write abbreviated ground state electron configurations for each of the following.
(a)
N
(b)
Ni
(c)
Pb
(d)
I
7.
Write the orbital diagram for C.
8.
How many unpaired electrons are there in the ground state of a Co atom?
9.
The difference in energy between the n=5 and n=4 levels in the hydrogen atom is
4.90 x 10-20 J. Calculate the wavelength of the radiation emitted when an electron
jumps from the n=5 level to the n=4 level. Is this radiation visible?
10.
Which of the following statements is true concerning the representative elements?
(a)
The atomic radius increases from left to right across the periodic table as
the effective nuclear charge increases.
(b)
The atomic radius increases from left to right across the periodic table as
the effective nuclear charge decreases.
(c)
The atomic radius decreases from left to right across the periodic table as
the effective nuclear charge increases.
(d)
The atomic radius decreases from left to right across the periodic table as
the effective nuclear charge decreases.
11.
Suppose that 5.00 J of energy is detected in a beam of green light ( = 514 nm).
Calculate the corresponding number of photons.
12.
Write the Lewis structure for each of the following.
13.
(a)
Si
(b)
S2-
(c)
Ca2+
(d)
Br
For each of the following, write the Lewis structure (including all resonance
structures where necessary), indicate the molecular geometry, and indicate if the
molecule is polar or nonpolar.
(a)
HCN
(b)
SO2
(c)
ClO3-
(d)
NH4+
(e)
BF3
14.
Which of the following is true concerning the compound sodium peroxide?
(a)
The bond between the oxygen atoms is a nonpolar, covalent, double bond.
(b)
The bond between the oxygen atoms is a nonpolar, covalent, single bond.
(c)
The bond between the oxygen atoms is a polar, covalent, single bond.
(d)
The bond between the oxygen atoms is an ionic bond.
15.
A zinc strip is placed in a solution of hydrochloric acid. A reaction occurs
resulting in the production of hydrogen gas. Assuming that 225 mL of hydrogen
gas is collected at a pressure of 765 torr and a temperature of 23.2OC, calculate
the mass of the zinc strip (assume that all of the zinc is reacted in the presence of
excess hydrochloric acid). The vapor pressure of water at this temperature is 21.2
torr.
16.
A sample of gas has a pressure of 725 torr and occupies a volume of 867 mL.
What will be the volume of the gas if the pressure is increased to 790 torr while
the temperature is held constant?
17.
Suppose that 410.2 mg of a gas occupies a volume of 242.0 mL at STP. Calculate
the molar mass of this gas.
18.
A sample of nitrogen gas has a temperature of 20.0OC, a pressure of 1.05 atm, and
a volume of 0.826 L. If the temperature is decreased to 10.0OC and the volume is
increased to 1.324 L, calculate the new pressure of the gas.
19.
What mass of hydrogen gas is in a 526 mL sample at 152OC and 728 torr?
20.
Calculate the density of argon gas in g/L at 45.0OC and 1.50 atm.
21.
Hydrogen gas reacts with nitrogen gas to produce ammonia gas according to the
following equation.
N2 (g) + 3 H2 (g)

2 NH3 (g)
If 426 mL of hydrogen gas is reacted with 162 mL of nitrogen gas what volume of
ammonia gas (in mL) is produced assuming that all gases are at STP?