By ECZ Study Tool, September 24, 2023
A redox reaction is a chemical reaction in which there is a transfer of electrons between two or more substances. It involves one substance losing electrons oxidation and another substance gaining those electrons reduction. Redox reactions are often characterized by changes in the oxidation states of the reacting atoms.
Key points about redox reactions include:
Oxidation and Reduction: Redox reactions always involve both
oxidation and reduction processes. Oxidation is the loss of electrons by one
substance, leading to an increase in its oxidation state. Reduction is the gain
of electrons by another substance, leading to a decrease in its oxidation
state.
Electron Transfer: The heart of a redox reaction is the transfer of
electrons from the substance being oxidized to the substance being reduced.
This transfer of electrons generates an electric current in certain cases, such
as in batteries and electrochemical cells.
Redox Couples: In redox reactions, substances often exist as pairs
of species with different oxidation states, known as redox couples. For
example, in the redox couple involving iron, Fe^2+ iron with a +2 oxidation
state can be oxidized to Fe^3+ iron with a +3 oxidation state.
Chemical Changes: Redox reactions result in chemical changes in the
substances involved. These changes can include the formation of new compounds,
the release of energy, or changes in color.
Applications: Redox reactions are fundamental in various practical
applications, including batteries, corrosion, combustion such as in the burning
of fuels, and biochemical processes such as cellular respiration and
photosynthesis.
Understanding redox reactions is
essential in chemistry as they are involved in a wide range of chemical
processes, both in the laboratory and in everyday life.
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