Chapter 5 Section 3
I. How do Covalent bonds form
a. The chemical ______ formed when 2 atoms _______
electrons, usually between 2 ____________
b. Most nonmetals ______bond with another _______ of
the ________ element
c. The ______ that holds atoms together in a _________
bond is the attraction of each atom’s _________ for
the shared _______ of electrons
d. A MOLECULE IS A ___________ GROUP OF
ATOMS __________ BY COVALENT BONDS.
e. Except for ___________, the number of covalent
bonds that nonmetals form _________ the number of
electrons needed to make a ________ of 8, hydrogen
only needs ____, Figure 15, page 167
f. Double and triple bonds can form when _______ share
_________ one pair of electrons, double 2 pairs,
triple 3 pairs.
i. Figure 16, page 168
II. Molecular Compounds
a. IS a __________ that is composed of ___________ that
are covalently bonded
b. Have ________ melting points and boiling points and
they _______ conduct electricity when __________ in
water. Math skills, page 169
c. Less heat is needed to _______ a covalent bond, that’s
why most molecular compounds are ______________
at room temperature
d. Do not conduct electricity because no charged
__________ are available to move. Even when they are
__________ they are ______conductors
e. __________ Sharing of electrons
f. Atoms of some elements pull _____________ on
shared electrons than do atoms of other elements. As a
result, the electrons are pulled more __________
atom, causing the bonded atoms to have slight
electrical charge.
g. These charges are _________ strong as ions
III. Polar bonds: A __________bond in which electrons are
shared ____________
IV. Non-polar bond: covalent bond in which the electrons
are shared ____________.
a. See figure 17, page 170
V. Polar bonds in molecules
a. A molecule with ___________ bonds will itself be
non-polar. But, a molecule may contain polar bonds
and still be non-polar overall.
b. A carbon dioxide molecule is a non-polar molecule
because it’s a ___________ shape. In contrast a water
molecule is polar because of its _____________. The
bent shape allows the O end to have a slight negative
charge and the H₂ end to have a slight positive charge
c. Attraction between molecules
i. Polar molecules require ____________ to break
the bond than non-polar molecule