Online Introductory
Chemistry
Lesson 5:
Molecular Compounds
Answers to
formative pretest true false questions for Lesson 5
Molecular Compounds. These questions are a quick overview of
the topics in this lesson. You are not expected to know this
material before hand. The questions are intended to help you
focus on material in the lesson. After you have studied the
lesson you should be able to answer these and even more
complicated questions.
1.
T The covalent bond
exists between atoms that share electrons. 2.
F The atoms in a
molecule have no repulsions between atomic
nuclei. 3.
T The distance
between atoms in a molecule is called the bond
length.. 4.
T Hydrogen normally
forms one bond. 5.
F The bond length or
distance is the same for all covalent bonds. 6.
F A single covalent
bond exists when two atoms share an electron. 7.
F A triple bond is
weaker than a single bond. 8.
T Nitrogen can form
single, double and triple covalent bonds. 9.
T The C-O bond is
more polar than the C-F bond. 10.
F The group number
for a nonmetal element indicates the number of bonds it can
form. 11.
F The valence
electrons on an atom in a molecule are tied to the original
atom. 12.
T Lewis structures
show atom symbols and valence electrons. 13.
F The tetrahedron is
the basic shape for molecules like CH2CH2,
ethylene. 14.
F Water molecules
have a linear or straight shape with angles of 180
degrees. 15.
F The least
electronegative element is fluorine. 16.
F Polar bonds exist
between atoms that share electrons equally. 17.
F The number four is
indicated by the prefix "penta-". 18.
T The electron
configuration for the six electrons in carbon is
1s22s22p2 19.
F The bond angles in
methane CH4 are ninety degrees. 20.
F Carbon monoxide is
a polar molecule with the oxygen end being slightly
positive.
