Chap11-part1

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Unformatted text preview: Chemistry
102:

General
Descrip6ve
Chemistry
II
 Chemistry:
The
Central
Science,
11th
Edi6on
 Chapter
11:

Intermolecular
Forces,
 Liquids,
and
Solids
 1
 Chapter
11
Homework
 Red
concepts:

11.1,
11.4,
11.7
 Red
exercises:

11.9,
11.11,
11.13,
11.19,
11.21,
11.23,

 11.25,
11.29,
11.33,
11.37,
11.39,
11.53,
11.59,
11.61,
 11.63,
11.67,
11.71,
11.79,
11.85
 2
 States
of
Ma<er
 In
the
simplest
explana6on,
there
are
three
states
of
maMer:

 
gas,
liquid
&
solid.


 3
 Mendenhall
Glacier,
Juneau,
Alaska
 gas
 solid
 liquid
 liquid
 4
 Gases
consist
of
a
collec6on
of
molecules
in
constant,
“chao6c”
mo6on.

The

 aMrac6ve
energies
between
the
molecules
are
much
smaller
than
the
thermal
 kine6c
energies.

The
small
aMrac6ve
energies
allow
the
gas
to
expand
to
fill
 the
volume
of
its
container.
 Liquids
have
intermolecular
forces
strong
enough
to
hold
the
molecules
together.
 Liquids
are
much
more
dense
and
less
compressible
than
gases.

The
volume
of
a
 liquid
does
not
depend
on
the
volume
of
its
container.

Nonetheless,
the
aMrac6ve

 forces
in
a
liquid
are
not
strong
enough
to
fully
hold
the
structure
in
place,
and
a
 liquid
can
be
poured.
 Solids
have
intermolecular
forces
strong
enough
to
completely
hold
the
molecules
 together.

Solids
are
very
dense
and
much,
much
less
compressible
than
gases.


 The
volume
of
a
solid
does
not
depend
on
the
volume
of
its
container,
and
a
solid
 cannot
be
poured.
 Liquids
and
solids
are
referred
to
as
condensed
phases.
 Solids
have
different
crystalline
states
and
perhaps
some
liquids
do
also.
 5
 The
state
of
a
substance
depends
on
the
balance
between
the
kine6c
energies
 of
the
molecules
and
the
strength
of
aMrac6on
between
molecules.


 The
state
can
be
changed
by
altering
the
temperature
or
pressure.
 6
 •  Why
do
some
solids
dissolve
in
water
but
others
 do
not
 •  Why
are
some
substances
gases
at
room
 temperature,
but
others
are
liquid
or
solid?
 •  What
gives
metals
the
ability
to
conduct
 electricity,
what
makes
non‐metals
briMle?
 7
 8
 Intermolecular
forces
(IMF)
have
to
do
with
the
aMrac6on
 between
molecules

 1)  Ion‐dipole
 2)  dipole
–
dipole
 3)  H‐bonding
 4)  London
forces
 9
 ...
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This note was uploaded on 09/13/2011 for the course CHEM 102 taught by Professor Todd during the Spring '08 term at UNC.

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