Section 4.2
How Elements Form Compounds
Practice Test
1.
These elements have almost a complete lack of chemical reactivity.
a.
alkali metals
b.
halogens
c.
noble gases
d.
transition elements
Hint
2.
These interact when atoms react.
a.
inner-level electrons
b.
neutrons
c.
only s-sublevel electrons
d.
valence electrons
Hint
3.
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
4.
A sodium atom can achieve an octet by ________________.
a.
losing one electron
b.
gaining one electron
c.
gaining four electrons
d.
lose three electrons
Hint
5.
A chlorine atom attains an octet by ____________.
a.
gaining one electron
b.
gaining three electrons
c.
losing one electron
d.
losing five electrons
Hint
6.
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
Hint
7.
Hydrogen and oxygen atoms react to form water by __________ electrons.
a.
gaining
b.
losing
c.
losing and gaining electrons
d.
sharing
Hint
8.
A shared pair of electrons is called ___________________.
a.
a covalent bond
b.
an ionic bond
c.
an energy level
d.
compound
Hint
9.
How many single and double covalent bonds does a carbon atom have in a carbon dioxide molecule?
a.
two double bonds
b.
four single bonds
c.
one double bond and two single bonds
d.
two triple bonds
Hint
10.
A compound that conducts electricity when melted or dissolved in water is an _____________.
a.
electrolyte
b.
electron
c.
molecule
d.
hydrocarbon
Hint
11.
In general, the interparticle forces in covalent compounds are __________ those in ionic compounds.
a.
multiples of
b.
the same strength as
c.
stronger than
d.
weaker than
Hint
12.
Gasoline and oil are covalent compounds that are ______________ water.
a.
heavier than
b.
insoluble in
c.
miscible with
d.
soluble
Hint
13.
The covalent compound commonly found in plastic, disposable lighters is __________.
a.
butane
b.
gasoline
c.
water
d.
carbon monoxide
Hint
14.
Limestone, calcium carbonate, is a strong building material because of the ordered arrangement of __________ in its crystal structure.
a.
atoms
b.
covalent bonds
c.
ions
d.
molecules
Hint
15.
When hydrogen and oxygen react to form water, ______________.
a.
energy is released
b.
energy is absorbed
c.
the reaction is endothermic
d.
the mass increases
Hint
16.
The Lewis electron-dot structure of the bromide ion shows ___________ valence electrons.
a.
one
b.
four
c.
seven
d.
eight
Hint
17.
This is a metallic element that reacts violently with water.
a.
copper
b.
iron
c.
silver
d.
sodium
Hint
18.
A mystery compound dissolves in water to produce a solution that does not conduct electricity. The compound cannot be __________.
a.
benzene
b.
butane
c.
ethanol
d.
sodium chloride
Hint
