Unit 9: Redox Processes
Redox processes are essential in various fields, where electrons are transferred between substances, causing one to oxidize and another to reduce. The chapter explores the definition, identification, and balancing of redox reactions, as well as the workings of electrochemical cells and their applications, including corrosion, electrolysis, batteries, and biological processes. Key concepts such as oxidation numbers and cell potentials are examined to demonstrate their significance in spontaneous reactions and industrial processes.
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What we have learnt
- Redox reactions involve the transfer of electrons, where oxidation is the loss of electrons and reduction is the gain of electrons.
- Oxidation numbers help track electrons during chemical reactions, thus aiding in the identification of oxidized and reduced species.
- Electrochemical cells convert chemical energy into electrical energy through spontaneous redox reactions, with practical applications in batteries and electrolysis.
Key Concepts
- -- Redox Reaction
- A chemical reaction involving the transfer of electrons between two species, where one is oxidized and the other is reduced.
- -- Oxidation Number
- A numerical value assigned to an atom in a compound that indicates its degree of oxidation, helping to determine the atom's status as oxidized or reduced.
- -- Electrochemical Cell
- A device that converts chemical energy from spontaneous redox reactions into electrical energy, comprising oxidation and reduction half-cells.
- -- Standard Electrode Potential (E°)
- The measure of the tendency of a chemical species to be reduced, expressed in volts and measured against the standard hydrogen electrode.
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