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CHEM 219 EXAM 1 ALL QUESTIONS WITH COMPLETE SOLUTION.
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CHEM 219 EXAM 1 ALL QUESTIONS WITH COMPLETE SOLUTION.
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This is false advertising. This is not the exam questions, it is the problem set questions.
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By: ACTUALSTUDY • 6 months ago
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CHEM219
EXAM
1
On
a
piece
of
scratch
paper,
write
out
the
Lewis
Dot
Diagram
for
each
of
the
indicated
elements
and
determine
the
following
for
each:
a)
The
number
of
Lone
Pairs
the
atom
possesses
in
its
valence
shell.
b)
The
number
of
Unpaired
Electrons
the
atom
possesses
in
its
valence
shell.
c)
The
number
of
bonds
the
atom
will
form.
Oxygen
Carbon
Hydrogen
Nitrogen
-
CORRECT
ANSWER-Oxygen
-
a)
2
b)
2
c)
2
Carbon
-
a)
0
b)
4
c)
4
Hydrogen-
a)
0
b)
1
c)
1
Nitrogen
-
a)
1
b)
3
c)
3
Classify
the
bonding
between
the
given
pairs
of
atoms
as
ionic,
covalent,
or
polar
covalent.
Use
the
table
of
electronegativities
shown
below
to
help
with
the
classification.
a.
Br
and
Br
b.
K
and
Cl
c.
P
and
Cl
d.
C
and
O
e.
Na
and
Br
-
CORRECT
ANSWER-a.
Br-Br:
Electronegativity
difference
()
=
0
=
COVALENT
(or
pure
covalent)
b.
K-Cl:
()
=
2.2
=
IONIC
c.
P-Cl:
()=
0.9
=
POLAR
COVALENT
d.
C-O:
()=
1.0
=
POLAR
COVALENT
e.
Na-Br:
()
=
1.8
=
POLAR
COVALENT
Define
the
term
constitutional
isomer.
-
CORRECT
ANSWER-Two
(or
more)
different
chemical
compounds
with
the
same
molecular
formula
but
different
connectivity
between
the
atoms
in
their
structural
formulae.
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