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Questions and Answers
What is the difference between a direct redox reaction and an indirect redox reaction?
What is the difference between a direct redox reaction and an indirect redox reaction?
In a direct redox reaction, both oxidation and reduction reactions take place in the same vessel, while in an indirect redox reaction, oxidation and reduction take place in different vessels.
Define oxidation and reduction in the context of redox reactions.
Define oxidation and reduction in the context of redox reactions.
Oxidation is defined as a loss of electrons, while reduction is defined as a gain of electrons in the context of redox reactions.
How is chemical energy converted in a direct redox reaction?
How is chemical energy converted in a direct redox reaction?
In a direct redox reaction, chemical energy is converted to heat energy.
What is the device known as that converts chemical energy into electrical energy?
What is the device known as that converts chemical energy into electrical energy?
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What are the two half-cells in an electrochemical cell and what takes place in each?
What are the two half-cells in an electrochemical cell and what takes place in each?
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Study Notes
Redox Reactions
- Direct Redox Reactions: occur when the oxidizing agent and the reducing agent are directly in contact, resulting in a direct transfer of electrons.
- Indirect Redox Reactions: involve the transfer of electrons through an external circuit instead of direct contact between the reactants. This type of reaction typically happens in electrochemical cells.
- Oxidation: The loss of electrons by an atom, ion, or molecule. The substance that undergoes oxidation is called the reducing agent.
- Reduction: The gain of electrons by an atom, ion, or molecule. The substance that undergoes reduction is called the oxidizing agent.
Chemical Energy Conversion
- Direct Redox Reactions: Chemical energy is converted into heat or light energy through the direct transfer of electrons from the reducing agent to the oxidizing agent.
- Electrochemical cell: a device designed to convert chemical energy directly into electrical energy.
Electrochemical Cells
- Electrochemical cells consist of two half-cells connected by a salt bridge that facilitates the flow of charged particles.
- Anode: The half-cell where oxidation takes place, electrons are released into the external circuit.
- Cathode: The half-cell where reduction takes place, electrons enter the cathode from the external circuit.
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Description
Test your knowledge of electrochemistry and redox reactions with this quick revision quiz for CBSE Class-12 Chemistry. Challenge yourself with questions on oxidation, reduction, redox reactions, and more.
