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Questions and Answers
In a redox reaction, what is the oxidation number of an atom that has gained an electron?
In the ion-electron method, what is the purpose of adding $H^+$ ions to the equation?
What is the purpose of the Standard Hydrogen Electrode (S.H.E) in electrochemistry?
What is the term for the electrode at which reduction occurs in an electrochemical reaction?
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What is the oxidation number of an atom that has been oxidized in a redox reaction?
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Study Notes
Redox Reactions
- A redox reaction involves a change in oxidation number of atoms or ions.
Oxidation and Reduction
- Oxidation is a process that involves an increase in oxidation number, resulting in a loss of electrons.
- Reduction is a process that involves a decrease in oxidation number, resulting in a gain of electrons.
Electrolysis
- Cathode: the electrode where reduction takes place.
- Anode: the electrode where oxidation takes place.
- Electrode potential: the potential of an electrode to drive a reaction.
- Standard Hydrogen Electrode (SHE): a standard electrode used as a reference point.
Balancing Redox Equations
- Ion-electron method: a method used to balance redox equations by identifying the number of electrons involved in oxidation and reduction.
- Oxidation number change method: a method used to balance redox equations by identifying the change in oxidation number of atoms or ions.
Key Concepts
- Standard electrode potential: the potential of an electrode at standard conditions, used to compare the reactivity of different electrodes.
- Oxidation number: a number assigned to an atom or ion to indicate its degree of oxidation or reduction.
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Description
Understand the concepts of redox reactions, including oxidation number and state, electrolysis, and balancing redox equations. Learn to identify atoms being oxidized and reduced.
