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Covalent Bonds

Chemistry Book: Atoms & Bonding Chapter One, Section 4
by

Anne DaLuga

on 9 October 2013

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Transcript of Covalent Bonds

Covalent Bonds
Covalent Bond -
chemical
bond formed when
two
atoms
share
valence electrons
Molecule -
neutral
group of atoms
joined
by
covalent
bonds
How many bonds?
Molecular compound - compound composed of
molecules
Low melting points
bonds are weaker in covalent bonds
less heat/energy is needed to go from a solid to a liquid
Poor conductivity
no charged particles are available to move
used as insulators
Unequal sharing -
some atoms
pull
more strongly on shared
electrons
than other atoms -
electrons are pulled
more
toward that atom,
causing bonded atoms
slight

electrical
charges
(not as strong as ions)
Nonpolar
bond - EQUAL sharing
Polar
bond - UNEQUAL sharing
Attractions between molecules
Polar =
opposites attract
Nonpolar =
no attraction
Water is
polar
Oil is
nonpolar
They're molecules are not
attracted
to each other and, therefore, they don't
mix
Water molecules are
attracted
to other

water
molecules
Water stays with
water
and Oil stays with
oil
Soap
mixes with both making it possible for oil and water to mingle
Nonpolar bond -
EQUAL
strength
in
OPPOSITE
directions
Each one is a
Single
Bond
Double
Bond
Each one is a
Double Bond
Triple
Bond
Shared pair is circled.
Count the
shared
pair each time. By
sharing,
each Fluorine atom thinks it has a stable set
8
VE.

(-) and (+) show the slightly
charged ends of the molecule
Properties differ between polar and nonpolar because of differences in
attractions
between their molecules
Full transcript