E_-_102_F11_Notes

022137x1023mol116021773x1019c 9648531cmol

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Unformatted text preview: cal
equations
are
equivalent
 
 
 Balancing
REDOX
Reactions
 1. Write
separate
half‐reactions
for
oxidation
and
reduction
 2. Balance
all
atoms,
except
H
and
O
 3. Balance
O
atoms
by
adding
H2O
 4. Balance
H
atoms:
 • Acidic
medium:
add
H+
to
the
hydrogen‐deficient
side
 • Basic
medium:
add
H2O
to
the
hydrogen‐deficient
side
and
OH‐
to
the
other
side
 5. Balance
charges
by
adding
e‐
 6. Add
the
half‐reactions
to
cancel
e‐
 
 Final
equation
should
be
balanced
for
both
number
of
atoms
and
electrical
charges
 
 
 Question
E1
 Balance
the
following
REDOX
reactions:
 a) I2
+
H2S

→
H+
+
I‐
+
S

 
 (acidic
medium)
 
 b) CuS
+
NO3‐
→
Cu2+
+
SO42‐
+
NO
 (acidic
medium)
 c) N2H4
+
Cu(OH)2
→
N2
+
Cu

 
 (basic
medium)
 
 
 ChE102
Fall
2011
Class
Notes
‐
Electrochemistry
 
 
 
 
 
 
 
 E ‐3 
 
 Electrode
Potential
 Galvanic
=
produce
electricity
from
spontaneous
chemical
reactions
 [see Petrucci et al., Figure 20.3] 
 2+ 
 Cu(s) → Cu...
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This note was uploaded on 12/28/2011 for the course CHE 102 taught by Professor Simon during the Winter '08 term at Waterloo.

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