Section #: 3.2
How Atoms Combine
Practice Test
1.
A __________ is composed of two or more atoms held together by covalent bonds.
a.
ionic bond
b.
a gas
c.
covalent bond
d.
molecule
Hint
2.
The attraction of two atoms for a shared pair of electrons that hold the atoms together is called __________.
a.
a compound
b.
a covalent bond
c.
an ionic bond
d.
a chemical reaction
Hint
3.
According to the table, which material tested underwent a chemical change when vinegar was added?
Material Tested
Addition of Vinegar
Addition of Iodine
Heated with candle
Distilled water
No change
No change
Boiled
Cornstarch
No change
Turns blue
No change
Sugar
No change
No change
Melts
Baking soda
Fizzing takes place
No change
No change
Mystery mixture
Fizzing takes place
Turns blue
No change
a.
distilled water
b.
cornstarch
c.
sugar
d.
baking soda
Hint
4.
What makes an element stable?
a.
if it has a covalent bond
b.
if its nucleus is packed tightly
c.
if it has the same number of neutrons and protons
d.
if its outermost energy level is full
Hint
5.
What type of bond is shown in the figure?
a.
covalent
b.
ionic
c.
metallic
d.
hydrogen
Hint
6.
Why does a water molecule have a bent shape?
a.
it's a compound
b.
because it occurs on Earth as a solid, liquid, and a gas
c.
it's a polar molecule
d.
it has ionic bonds
Hint
7.
An Mg +2 particle has __________ electrons.
a.
gained one
b.
lost two
c.
gained two
d.
lost four
Hint
8.
What is the attractive force between two particles of opposite charge called?
a.
an ionic bond
b.
a covalent bond
c.
an isotope
d.
a compound force
Hint
9.
Bases produce __________ in solution.
a.
oxygen ions
b.
hydrogen ions
c.
helium ions
d.
hydroxide ions
Hint
10.
What is an ion?
a.
a molecule
b.
an isotope
c.
a charged particle
d.
a gas
Hint
11.
What type of bond is shown in the figure?
a.
covalent
b.
ionic
c.
metallic
d.
hydrogen
Hint
12.
Predict what will happen to the zinc shown in the higher concentration of acid, as shown in the figure.
a.
it will dissolve faster
b.
it will dissolve slower
c.
it will not affect the rate at which it dissolves
d.
it will form a covalent bond with the acid
Hint
