CHM 2046 General chemistry 2 ch.17 learning objectives summary

17 .




Ch 17 .
: ELECTRACHEMISTRY
1. Identify Redox reactions and use the half-reaction method to balance redox reactions

·
REDOX-REACTION -
change in oxidation number (due to electron transfer
>
-
L E . .
0 : Lose Electrons Oxidation (Oxidation number ECREASEs) -
Reducing agent
↳
G E .
.
R :
Gain Electrons Reduction (Oxidation # IREASES) -
Oxidizing agent




·
Half-reaction method of balancing :




-




SEP 1 : determine Ox # &
.


Identify oxidation/ reduction

-




SE : split reaction between the reduction & the oxidation.
-




SE 3 : Balance the coeficients ("mus)") :




-
(3 1) all elements other than H &.

.

- (3 2) Balance O2 by adding
.
H 0
,

(3 3) Balance He by adding I
+
↳ .




↳
(3 4) neutralize It" by adding OH- (in both sides
IN BASIC SOLUTION .




(the side with both H & OH-convert them in1, 0) +



- 4 : balance the chage of each uxn in both sides by adding e : .




- 5 :
make #of -E in both half-oxn .


by multiplying
- 6 :
Add both rxns.

, 2. Design a voltaic (galvanic) cell including describing the location and purpose of: anode,
cathode, electrodes, salt bridge and the path of current




3. Represent electrochemical cells using electrochemical cell notation