Electrochemical Cells:
1) Galvanic Cells
2) Electrolytic Cells
Similarities |
· They consist of an electrolyte each. Ø Electrolyte is mixture of ions (usually in aqueous solution) that are involve in reaction or that carry charge. · They consist of two electrodes. Ø Electrodes are objects that conduct electricity between cell and surroundings. Ø Electrodes consist of : I. Anode – Oxidation half-reaction takes place II. Cathode – Reduction half-reaction takes place · The process of donation of electrons occurs at the anode while the process of acceptance of electrons occurs at the cathode. · Electrons flow from the anode to the cathode in the external circuit. |
Galvanic Cells | Differences | Electrolytic Cells |
Converts electrical energy to chemical energy | Conversion of energy | Converts chemical energy to electrical energy |
a) The anode (positive terminal) is positively charged. b) The cathode (negative terminal) is negatively charged. | Charge of a) Anode b) Cathode | a) The anode (negative terminal) is negatively charged. b) The cathode (positive terminal) is positively charged. |
Carbon of two same metals or two different metals. | Type of electrodes | Two different metals. |
Spontaneous reaction. -Reaction that has a natural tendency to occur and does not require an energy input for it to occur. -eg : rusting of iron nails | Type of reaction | Non-spontaneous reaction. -Reaction that cannot occur naturally and needs energy input to help it to occur. -eg : photosynthesis |
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