Formation of Compounds
Practice Test
1.
In an ionic crystal, these attract each other.
a.
positive ions
b.
positive and negative ions
c.
positive and negative atoms
d.
negative ions
2.
Carbon dioxide is __________ in water.
a.
a solid
b.
insoluble
c.
soluble
d.
blue
3.
Green plants take in this gas and give off oxygen during photosynthesis.
a.
nitrogen
b.
hydrogen
c.
carbon dioxide
d.
ammonia
4.
This is a metallic element that reacts violently with water.
a.
copper
b.
iron
c.
silver
d.
sodium
5.
These two elements combine to form water.
a.
hydrogen and oxygen
b.
carbon and hydrogen
c.
carbon and oxygen
d.
hydrogen and chlorine
6.
These elements have almost a complete lack of chemical reactivity.
a.
noble gases
b.
halogens
c.
alkali metals
d.
transition elements
7.
How many single and double covalent bonds does a carbon atom have in a carbon dioxide molecule?
a.
one double bond and two single bonds
b.
two double bonds
c.
two triple bonds
d.
four single bonds
8.
The covalent compound commonly found in plastic, disposable lighters is __________.
a.
water
b.
butane
c.
gasoline
d.
carbon monoxide
9.
These interact when atoms react.
a.
neutrons
b.
valence electrons
c.
inner-level electrons
d.
only s-sublevel electrons
10.
When hydrogen and oxygen react to form water, ______________.
a.
the reaction is endothermic
b.
the mass increases
c.
energy is released
d.
energy is absorbed
11.
A compound that conducts electricity when melted or dissolved in water is an _____________.
a.
hydrocarbon
b.
electron
c.
molecule
d.
electrolyte
12.
A shared pair of electrons is called ___________________.
a.
compound
b.
an ionic bond
c.
a covalent bond
d.
an energy level
13.
A sodium atom can achieve an octet by ________________.
a.
gaining one electron
b.
losing one electron
c.
lose three electrons
d.
gaining four electrons
14.
Hydrogen and oxygen atoms react to form water by __________ electrons.
a.
losing and gaining electrons
b.
losing
c.
gaining
d.
sharing
15.
The Lewis electron-dot structure of the bromide ion shows ___________ valence electrons.
a.
four
b.
one
c.
seven
d.
eight
16.
In general, the strong crystal structure of ionic compounds causes them to have ________________.
a.
high melting points
b.
low boiling points
c.
soft structures
d.
low melting points
17.
Molten sodium chloride conducts electricity because ______________________.
a.
chlorine gas escapes
b.
the chlorine atoms carry a charge
c.
the ions are free to move
d.
solid sodium conducts, too
18.
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
19.
This compound is commonly found in all three states of matter on Earth's surface.
a.
sodium chloride
b.
iron oxide
c.
water
d.
carbon dioxide
20.
In general, the interparticle forces in covalent compounds are __________ those in ionic compounds.
a.
stronger than
b.
the same strength as
c.
weaker than
d.
multiples of
21.
Gasoline and oil are covalent compounds that are ______________ water.
a.
miscible with
b.
insoluble in
c.
heavier than
d.
soluble
