Chapter 7: Redox Processes
Redox processes involve the transfer of electrons between chemical species, playing a crucial role in various chemical and biological phenomena. Understanding oxidation states, half-equations, and the methods to balance redox reactions is vital for stoichiometric calculations in acidic and basic solutions. Additionally, electrochemical cells demonstrate the conversion of chemical energy into electrical energy and vice versa, stemming from redox reactions.
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What we have learnt
- Redox processes comprise oxidation (loss of electrons) and reduction (gain of electrons).
- Oxidation states help track electron transfer, indicating changes in charge for atoms during reactions.
- Electrochemical cells can be galvanic (spontaneous) or electrolytic (non-spontaneous), each with distinct applications and functions.
Key Concepts
- -- Redox Reaction
- A chemical reaction involving the transfer of electrons between two species, resulting in changes in oxidation states.
- -- Oxidation State
- A hypothetical charge assigned to an atom in a molecule or ion, used to keep track of electrons during redox reactions.
- -- Electrochemical Cell
- A device that converts chemical energy into electrical energy (galvanic cell) or uses electrical energy to drive non-spontaneous reactions (electrolytic cell).
- -- Standard Electrode Potential
- The measure of the individual potential of a reversible electrode at standard conditions, usually measured relative to the Standard Hydrogen Electrode.
- -- Faraday's Laws of Electrolysis
- Laws that explain the relationship between the quantity of electricity passed through an electrolyte and the mass of substance produced or consumed at the electrodes.
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