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Secondary Cell

Chemistry Form 4 Chapter 6
by

christine lei

on 26 July 2013

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Transcript of Secondary Cell

CHEMISTRY
in form 4
CHAPTER 6
Lead-acid Accumulator
Nickel-cadmium Cell
ELECTROCHEMISTRY
VOLTAIC CELL
SECONDARY CELL
LEAD-ACID ACCUMULATOR
Using 12 V of electrical energy
Used as vehicle battery for cars and lorries.
Provide electrical energy to submarines and emergency equipment in hospitals
NICKEL-CADMIUM CELL
Operates with the same principles as lead-acid accumulator but using different chemical substance
Used in electrical items such as drills, outdoor equipment, and other portable devices and emergency lighting systems
LEAD-ACID ACCUMULATOR
Provides 12 V of electrical energy
Used as vehicle battery for cars and lorries
Provide electrical energy to submarines and emergency equipment in hospitals
Chemical Reaction
Negative Terminal
Cd+2OH
Cd(OH) +2e
-
-
2
Positive Terminal
NiO +2H O+2e
Ni(OH) +2OH
-
-
2
2
2
Chemical Reaction
Negative Terminal
Pb Pb +2e
2
-
Positive Terminal
PbO +4H +2e
Pb +2H O
2+
2
2
+
-
Advantages
Disadvantages
Can be recharged
Provides a large and fixed current for a long period
Heavy and expensive
Acid spills easily
Spoils easily if not taken care properly
Advantages
Disadvantages
Long-lasting
Rechargeable
Chemical substances does not easily spill
Able to function even though not used for a long period of time
Concentration of electrolyte does not change
Expensive
CREATED BY:
Chong Woan Lei
Vivian Lee
Afrizan
Bubye
Full transcript