Formation of Compounds
Practice Test
1.
Molten sodium chloride conducts electricity because ______________________.
a.
the ions are free to move
b.
chlorine gas escapes
c.
solid sodium conducts, too
d.
the chlorine atoms carry a charge
2.
This compound is commonly found in all three states of matter on Earth's surface.
a.
carbon dioxide
b.
water
c.
iron oxide
d.
sodium chloride
3.
In an ionic crystal, these attract each other.
a.
positive ions
b.
positive and negative ions
c.
negative ions
d.
positive and negative atoms
4.
Green plants take in this gas and give off oxygen during photosynthesis.
a.
nitrogen
b.
ammonia
c.
hydrogen
d.
carbon dioxide
5.
Limestone, calcium carbonate, is a strong building material because of the ordered arrangement of __________ in its crystal structure.
a.
covalent bonds
b.
ions
c.
molecules
d.
atoms
6.
In general, the interparticle forces in covalent compounds are __________ those in ionic compounds.
a.
stronger than
b.
multiples of
c.
the same strength as
d.
weaker than
7.
A mystery compound dissolves in water to produce a solution that does not conduct electricity. The compound cannot be __________.
a.
ethanol
b.
butane
c.
benzene
d.
sodium chloride
8.
How many single and double covalent bonds does a carbon atom have in a carbon dioxide molecule?
a.
four single bonds
b.
two double bonds
c.
one double bond and two single bonds
d.
two triple bonds
9.
A chlorine atom attains an octet by ____________.
a.
gaining three electrons
b.
losing one electron
c.
losing five electrons
d.
gaining one electron
10.
Except for helium, this expresses the stability of a noble-gas atom's filled s and p sublevels.
a.
the sextet rule
b.
the duet rule
c.
the trio rule
d.
the octet rule
11.
The covalent compound commonly found in plastic, disposable lighters is __________.
a.
gasoline
b.
water
c.
butane
d.
carbon monoxide
12.
Carbon dioxide is __________ in water.
a.
insoluble
b.
soluble
c.
a solid
d.
blue
13.
A compound that conducts electricity when melted or dissolved in water is an _____________.
a.
molecule
b.
electron
c.
hydrocarbon
d.
electrolyte
14.
The Lewis electron-dot structure of the bromide ion shows ___________ valence electrons.
a.
one
b.
seven
c.
four
d.
eight
15.
In general, the strong crystal structure of ionic compounds causes them to have ________________.
a.
high melting points
b.
low melting points
c.
soft structures
d.
low boiling points
16.
This is a metallic element that reacts violently with water.
a.
iron
b.
silver
c.
sodium
d.
copper
17.
A shared pair of electrons is called ___________________.
a.
an energy level
b.
a covalent bond
c.
an ionic bond
d.
compound
18.
These two elements combine to form water.
a.
hydrogen and chlorine
b.
carbon and hydrogen
c.
carbon and oxygen
d.
hydrogen and oxygen
19.
A sodium atom can achieve an octet by ________________.
a.
gaining one electron
b.
losing one electron
c.
gaining four electrons
d.
lose three electrons
20.
These interact when atoms react.
a.
neutrons
b.
valence electrons
c.
inner-level electrons
d.
only s-sublevel electrons
21.
When hydrogen and oxygen react to form water, ______________.
a.
the mass increases
b.
energy is released
c.
the reaction is endothermic
d.
energy is absorbed
