E_-_102_F11_Notes

Figure55 thesetwochemicalequationsareequivalent

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a
reduction‐oxidation
reaction,
one
of
the
reagents
is
oxidized
while
the
other
is
 reduced
 • A
chemical
substance
is
oxidized
when
it
loses
electrons:

 












Zn
→
Zn2+
+
2e‐

(O.S.:
0
→
+2)
 • A
chemical
substance
is
reduced
when
it
gains
electrons:

 












Cu2+
+
2e‐
→
Cu

(O.S.:
+2
→
0)
 • Substance
that
causes
the
oxidation
of
another
is
called
the
oxidizing
agent
or
 ______________________.
 • Substance
that
causes
the
reduction
of
another
is
called
the
reducing
agent
or
 ______________________.
 
 
 Examples
of
REDOX
Reactions
 
 Zn
(s)
+
2
H+
(aq)
→
Zn2+
(aq)
+
H2
(g)
 Zn
(s)
→
Zn2+
(aq)
+
___
e‐
 
 (reducing
agent)
 ___
H+
(aq)
+
___
e‐
→
H2
(g)

 
 (oxidizing
agent)
 
 Zn
(s)
+
Cu2+
(aq)
→
Zn2+
(aq)
+
Cu
(s)
 Zn
(s)
→
Zn2+
(aq)
+
___
e‐
 
 (reducing
agent)
 Cu2+
(aq)
+
___
e‐
→
Cu
(s)
 
 (oxidizing
agent)
 
 Cu
(s)
+...
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