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Anonymous users2024-02-06A galvanic battery is a device that can generate an electric current through a redox reaction, and it can also be said to be a device that converts chemical energy into electrical energy.
Some galvanic cells can constitute a reversible battery, while others are not. When the galvanic battery is discharged, the negative electrode undergoes an oxidation reaction and the positive electrode undergoes a reduction reaction. For example, copper-zinc primary batteries, also known as Daniel batteries, have a positive electrode of copper electrode, immersed in sulfuric acid solution; The negative electrode is a zinc plate, immersed in a zinc sulfate solution.
The two electrolyte solutions are connected with a salt bridge, and the two poles are connected with wires to form a galvanic cell. The dry batteries used in daily use are made according to the principle of galvanic batteries.
Principle. A device that converts chemical energy into electrical energy.
Class. Primary batteries, secondary batteries, fuel cells.
How it works. The galvanic cell reaction is an exothermic reaction, which is generally a redox reaction, but what is different from the general redox reaction is that the electron transfer is not completed by the effective collision between the oxidant and the reducing agent, but the oxidation reaction occurs when the reducing agent loses electrons on the negative electrode, and the electrons are transported to the positive electrode through the external circuit, and the electrons obtained by the oxidant on the positive electrode undergo a reduction reaction, so as to complete the transfer of electrons between the reducing agent and the oxidant. The directional movement of ions in the solution between the two poles and the directional movement of electrons in the external wire constitute a closed loop, so that the two electrodes react continuously, an orderly electron transfer process occurs, and an electric current is generated, so as to realize the conversion of chemical energy to electrical energy.
How galvanic batteries work.
However, it should be noted that non-redox reactions can be designed as galvanic cells. From the perspective of energy conversion, galvanic batteries are devices that convert chemical energy into electrical energy; From the perspective of chemical reaction, the principle of galvanic cells is that the electrons lost by the reducing agent in the redox reaction are transferred to the oxidant through an external wire, so that the redox reaction is carried out on two electrodes.
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Anonymous users2024-02-05Easy to learn the principle of galvanic batteries High School Chemistry Compulsory 2 It's really easy to learn chemistry.
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Anonymous users2024-02-04For inert electrodes:
Cathode: 2cu +4e = 2cu
Anode: 2H O + 4e = 4H + O
Total equation: 2cu +2h o=2cu+o +4h copper cong zinc galvanic battery, also known as Daniel battery, its positive electrode is copper electrode, immersed in copper sulfate solution; The negative electrode is a zinc plate, immersed in a zinc sulfate solution. The two electrolyte solutions are connected with a salt bridge, and the two poles are coarsely connected with wires to form a galvanic cell.
The dry batteries used in daily use are made according to the principle of galvanic batteries.
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