Redox Reaction Flashcards
(9 cards)
What is Galvanic Cell Reaction?
A spontaneous redox reactions as electrons are transferred and energy is released naturally. Reaction does not require external power supply
How does Galvanic Cell occurs?
The oxidation occurs at anode while reduction occurs at cathode. Anode is at negative terminal while cathode is at positive terminal. Electrons flow from anode to cathode through the external circuit which generates electricity. Ions flow through salt bridge to facilitate ions movement to complete the circuit and there will be potential difference created and to maintain cell neutrality and balance the charges of two half-cell
How does electrode changes after galvanic cell?
Anode, the size of electrode decreases
Cathode, the size of electrode increases
Overall, voltmeter needle deflects
How does half-cell potential difference relates to voltage of cell?
The greater the difference the greater the voltage
What is the purpose of SHE?
Any half cell connected to SHE is to obtain the standard reduction potential of that half cell
What is Primary Cells? Its advantages and disadvantages, and usage.
Type of galvanic cell that are disposable and designed not to be recharged. Its advantages are inexpensive and portable. Disadvantages are relatively short-life span and cheap casing that can dissolve causing leakage. Maximum voltage is 1.5V only. Uses for radio and remote controller
What is Secondary cells?
A type of galvanic cell that are rechargeable and designed to be reused multiple times. Its advantages are ability to store large quantities of charge (12V) and can be recharged by the car generator. Its disadvantages are expensive and bulky. Mostly use in motor vehicles and isolated farm houses
What is fuel cells?
A galvanic cell that continuously produce electricity for as long as fuel is fed into the cells. Is advantages are does not store reactants and products and constant voltage output. Disadvantages are expensive and bulky. Uses in motor vehicles and portable power generation
What is electrolytic cell?
Uses an external electrical potential difference to provide energy and allow non-spontaneous redox reaction to occur.
