Water and Its Solutions
Practice Test
1.
This is a metallic element that reacts violently with water.
a.
sodium
b.
silver
c.
copper
d.
iron
2.
What element has the electron configuration [Ar]4s
2
3d
3
?
a.
arsenic
b.
scandium
c.
nitrogen
d.
vanadium
3.
The two rows beneath the main body of the periodic table contain the _________________.
a.
alkali metals
b.
noble gases
c.
halogens
d.
inner transition elements
4.
a.
red
b.
blue
c.
green
d.
violet
5.
Molarity equals ______________________.
a.
grams of solute per gram of solution
b.
liters of solute per kilogram of solution
c.
grams of solute per liter of solution
d.
moles of solute per liter of solution
6.
The Lewis electron-dot structure of the bromide ion shows ___________ valence electrons.
a.
eight
b.
four
c.
one
d.
seven
7.
Na
2
SO
4
is the formula for _______________.
a.
sodium sulfite
b.
sodium sulfur oxide
c.
sodium sulfate
d.
sodium sulfide
8.
These types of compounds make eggshells brittle.
a.
molecular
b.
ionic
c.
network
d.
covalent
9.
Your body is about __________ water by weight.
a.
75%
b.
10%
c.
90%
d.
60%
10.
What is the molarity of a solution prepared by dissolving 50.0 g of NaCl to make 500.0 mL of solution?
a.
1.17 M
b.
0.100 M
c.
0.855 M
d.
1.71 M
11.
How many moles of magnesium atoms is 7.32 × 10
26
atoms?
a.
6.02 × 10
3
mol
b.
1.22 × 10
3
mol
c.
8.23 × 10
26
mol
d.
4.44 × 10
1
mol
12.
The CO
2
molecule is _____________.
a.
pyramidal
b.
trigonal planar
c.
linear
d.
hexagonal
13.
Which of these is the electron configuration of an atom most likely to gain an electron?
a.
1s2 2s2 2p6
b.
1s2 2s2 2p6 3s2 3p5
c.
1s2 2s2 2p6 3s1
d.
1s2 2s2 2p6 3s2 3p6 4s1
14.
What is the formula for the binary compound that forms when potassium and sulfur react?
a.
K
2
SO
4
b.
KS
2
c.
KS
d.
K
2
S
15.
Because of its ________________, a large body of water helps moderate the temperature of the surrounding area.
a.
boiling point
b.
low density
c.
high specific heat
d.
low specific heat
16.
Diatomic oxygen and ozone are _____________.
a.
isotopes
b.
different elements
c.
allotropes
d.
ionic
17.
A solid that has no regular structure is said to be ____________.
a.
cubic
b.
hexagonal
c.
amorphous
d.
crystalline
18.
If the theoretical yield of a reaction is 0.2100 g and the actual yield is 0.1880 g, what is the percent yield?
a.
11.00%
b.
89.50%
c.
112%
d.
51.30%
19.
Water molecules stick together to form droplets because of their ___________.
a.
polarities
b.
masses
c.
volumes
d.
covalencies
20.
According to the kinetic-molecular theory, which of these describes a gas?
a.
small particles in constant, random motion
b.
large particles far apart in uniform motion
c.
large particles in constant, random motion
d.
small particles far apart in uniform motion
