Quiz 2
Ch2
Name________________________
Remote # ____________
1. The strongest chemical bond in
molecules essential to living things is the
_________________bond
a. Covalent
b. Ionic
c. Polar covalent
d. Hydrogen
e. None of the above
6. Why are hydrophobic molecules such as
fats and oils unable to dissolve in watery
solutions?
a. Water cannot interact with molecules that
have polar covalent bonds, such as fats and
oils.
b. Water cannot interact with molecules with
ionic bonds, such as fats and oils.
c. Water cannot interact with hydrophobic
molecules, such as fats and oils, because
hydrophobic molecules form hydrogen
bonds with each other, excluding the water.
d. Water molecules form hydrogen bonds
with each other, excluding the hydrophobic
molecules.
2. In the crystal matrix of ordinary salt, the
sodium and chlorine are held together by:
a. Atomic bonds
b. Covalent bonds
c. Ionic bonds
d. Hydrogen bonds
e. Nonpolar bonds
7. Why does water so greatly resist
increases in temperature?
a. It takes great energy to break the ionic
bonds that hold water molecules together.
b. It takes great energy to break the
covalent bonds that hold water molecules
together.
c. It takes great energy to break the huge
number of hydrogen bonds that hold water
molecules together.
d. none of the above
3. The atomic number of carbon is 6. A
carbon atom has __________ protons and
__________ electrons.
a. 3, 3
b. 6, 6
c. 6, 12
d. 6, 3
4. Ions are atoms that have __________.
a. different numbers of neutrons
b. broken apart due to radioactive decay
c. gained an electron
d. lost an electron
e. gained or lost an electron
8. A solution of pH 7 has ________ times
_________ H+ ions than a solution of pH 9.
a. 100; fewer
b. 100; more
c. 2; fewer
d. 2; more
5. Ionic bonds form between atoms that
have __________.
a. empty outermost electron shells
b. full outermost electron shells
c. nearly empty and nearly full outermost
electron shells
d. equal numbers of protons
e. equal numbers of neutrons
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