A_-_102_F11_Notes

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Unformatted text preview: • Two
or
more
atoms,
joined
by
covalent
bonds,
may
form
a
charged
polyatomic
ion.

 For
example:


 Ammonium
 
 Carbonate
 
 Sulphate
 ChE102
Fall
2011
Class
Notes
‐
Introduction
 A ‐2 
 Identifying
Compounds
 • An
ionic
compound
is
usually
a
metal
combined
with
a
non‐metal.
 • One
of
the
parts
may
be
one
the
polyatomic
ions
 For
example:

 
 
 • A
covalent
compound
tends
not
to
consist
of
a
metal
with
a
non‐metal
 • Large,
organic
(carbon
containing)
molecules
are
usually
covalent.

 For
example:

 
 
 Dissolution
 • When
an
ionic
compound
dissolves
in
water,
it
(wholly
or
partially)
dissociates
into
 ions.

(www.northland.cc.mn.us/biology/Biology1111/animations/dissolve.html)
 For
example:

 
 
 • A
covalent
compound
does
not
dissociate
 For
example:

 
 
 Composition
 The
empirical
formula
is
the
simplest
possible
formula
for
a
particular
compound
 • Gives
the
relative
number
of
atoms
in
a
molecule
 • Different
substances
can
have
the
same
empirical
formula
 • For
example,
empirical
formula
of
hexene
is
CH2
 The
molecular
formula
gives
the
actual
number
of
atoms
in
a
molecule

 • Molecular
formula
can
be
obtained
from
the
empirical
formula
if
the
molar
mass
of
 the
compound
is
known
 • For
example,
molecular
formula
of
hexene
is
C6H12
 
 
 Question
A1
 Choose
the
INCORRECT
statement.

 A)
A
molecule
is
a
group
of
bonded
atoms
that
exist
as
an
entity.
 B)
Ionic
compounds
result
from
combinations
of
metals
and
non‐metals.
 C)
An
anion
is
a
positive
ion.

 D)
The
empirical
formula
is
the
simplest
formula
of
the
ratio...
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