Chapter 4:
Formation of Compounds
Practice Test
1.
In an ionic crystal, these attract each other.
a.
negative ions
b.
positive and negative atoms
c.
positive ions
d.
positive and negative ions
Hint
2.
This is a metallic element that reacts violently with water.
a.
iron
b.
silver
c.
sodium
d.
copper
Hint
3.
A shared pair of electrons is called ___________________.
a.
an ionic bond
b.
compound
c.
an energy level
d.
a covalent bond
Hint
4.
These two elements combine to form water.
a.
hydrogen and chlorine
b.
carbon and oxygen
c.
hydrogen and oxygen
d.
carbon and hydrogen
Hint
5.
Carbon dioxide is __________ in water.
a.
a solid
b.
blue
c.
insoluble
d.
soluble
Hint
6.
This compound is commonly found in all three states of matter on Earth's surface.
a.
sodium chloride
b.
carbon dioxide
c.
iron oxide
d.
water
Hint
7.
A compound that conducts electricity when melted or dissolved in water is an _____________.
a.
electron
b.
electrolyte
c.
molecule
d.
hydrocarbon
Hint
8.
How many single and double covalent bonds does a carbon atom have in a carbon dioxide molecule?
a.
two triple bonds
b.
four single bonds
c.
two double bonds
d.
one double bond and two single bonds
Hint
9.
These interact when atoms react.
a.
only s-sublevel electrons
b.
neutrons
c.
inner-level electrons
d.
valence electrons
Hint
10.
The Lewis electron-dot structure of the bromide ion shows ___________ valence electrons.
a.
seven
b.
four
c.
eight
d.
one
Hint
11.
Molten sodium chloride conducts electricity because __________.
a. chlorine gas escapes
b. solid sodium conducts, too
c. the ions are free to move
d. the chlorine atoms carry a charge
Hint
12.
A mystery compound dissolves in water to produce a solution that does not conduct electricity. The compound cannot be __________.
a.
butane
b.
benzene
c.
ethanol
d.
sodium chloride
Hint
13.
In general, the interparticle forces in covalent compounds are __________ those in ionic compounds.
a.
weaker than
b.
stronger than
c.
the same strength as
d.
multiples of
Hint
14.
Except for helium, this expresses the stability of a noble-gas atom's filled s and p sublevels.
a.
the duet rule
b.
the octet rule
c.
the sextet rule
d.
the trio rule
Hint
15.
A sodium atom can achieve an octet by ________________.
a.
gaining four electrons
b.
losing one electron
c.
gaining one electron
d.
lose three electrons
Hint
16.
A chlorine atom attains an octet by ____________.
a.
gaining one electron
b.
gaining three electrons
c.
losing one electron
d.
losing five electrons
Hint
17.
Sodium and chlorine react to produce __________.
a. liquid sodium
b. sodium chloride
c. sodium chlorine
d. gaseous chlorine
Hint
18.
Hydrogen and oxygen atoms react to form water by __________ electrons.
a.
losing and gaining electrons
b.
sharing
c.
gaining
d.
losing
Hint
19.
When hydrogen and oxygen react to form water, ______________.
a.
energy is released
b.
the reaction is endothermic
c.
the mass increases
d.
energy is absorbed
Hint
20.
In general, the strong crystal structure of ionic compounds causes them to have ________________.
a.
soft structures
b.
low melting points
c.
low boiling points
d.
high melting points
Hint
