Voltaic cells (Galvanic cells)€¦ · Voltaic cells (Galvanic cells) A spontaneous chemical...
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PbO 2 + Pb + 2H 2 SO 4 2PbSO 4 + 2H 2 O Discharge cycle Chemical energy Electrical energy Electrical energy Chemical energy oxidation reduction anode cathode Cellular phone Laptop battery Car battery Household batteries Battery uses Voltaic cells (Galvanic cells) A spontaneous chemical reaction creates a potential difference which causes current to flow IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Voltmeter I I I I I I I II I IIIII IIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIII IIII I I I I I I e - e - Pb 2+ Pb 2+ Pb 2+ Pb 2+ K + K + NO 3 - NO 3 - NO 3 - NO 3 - NO 3 - NO 3 - Mg 2+ Mg 2+ Mg 2+ Mg 2+ Cathode Anode Salt bridge Pb Mg Mg Mg 2+ + 2e - Oxidation Pb 2+ + 2e - Pb Reduction Lead-acid cells (car battery) Secondary (rechargeable) cells Charge cycle PbSO 4 + 2H 2 O PbO 2 + 4H + + SO 4 2- + 2e - Pb 2+ + 2e - Pb Pb 2+ Pb 4+ + 2e - Pb Pb 2+ + 2e - Pb 4+ + 2e - Pb 2+ Pb + SO 4 2- PbSO 4 + 2e - PbSO 4 + 2e - Pb + SO 4 2- PbO 2 + 4H + + SO 4 2- + 2e - PbSO 4 + 2H 2 O oxidation reduction cathode anode + - - +
Transcript of Voltaic cells (Galvanic cells)€¦ · Voltaic cells (Galvanic cells) A spontaneous chemical...
PbO2 + Pb + 2H2SO4 2PbSO4 + 2H2O
Discharge cycle
Chemical energy Electrical energy
Electrical energy Chemical energy
oxidation reduction
ano
de
catho
de
Cellular phone
Laptop battery
Car battery
Household batteries
Battery usesVoltaic cells (Galvanic cells)A spontaneous chemical reaction creates a
potential difference which causes current to flow
IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
Voltmeter
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IIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIe- e-
Pb2+
Pb2+Pb2+
Pb2+
K+
K+
NO 3-
NO 3-
NO 3-
NO 3-
NO 3-
NO
3 -
Mg2+
Mg2+
Mg2+Mg2+
Cath
od
e
An
od
e
Salt bridge
Pb Mg
Mg Mg2+ + 2e-
Oxidation
Pb2+ + 2e- Pb
Reduction
Lead-acid cells (car battery)Secondary (rechargeable) cells
Charge cycle
PbSO4 + 2H2O PbO2 + 4H+ + SO42- + 2e-
Pb2+ + 2e- Pb Pb2+ Pb4+ + 2e-
Pb Pb2+ + 2e- Pb4+ + 2e- Pb2+
Pb + SO42- PbSO4 + 2e-
PbSO4 + 2e- Pb + SO42-
PbO2 + 4H+ + SO42- + 2e- PbSO4 + 2H2O
oxidationreduction
catho
de
ano
de
+ -- +
