AP Chemistry Flashcards: Oxidation-Reduction (Redox) Reactions
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
What fundamental principle is satisfied when constructing a balanced redox equation from half-reactions?
This method ensures the conservation of both mass (atoms) and charge (electrons) in the overall reaction.
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What fundamental principle is satisfied when constructing a balanced redox equation from half-reactions?
This method ensures the conservation of both mass (atoms) and charge (electrons) in the overall reaction.
When combining half-reactions, what must be made equal between the oxidation and reduction steps before adding them?
The number of electrons lost in the oxidation half-reaction must be made equal to the number of electrons gained in the reduction half-reaction.
What is a half-reaction?
A half-reaction is an equation that represents either the oxidation or the reduction process in a redox reaction, showing the electrons that are lost or gained.
Can a single half-reaction occur on its own?
No, oxidation and reduction half-reactions must occur simultaneously; one cannot happen without the other.
How are half-reactions used to create a final balanced redox equation?
The individual half-reactions are balanced for mass and charge, scaled to have equal numbers of electrons, and then added together to represent the overall reaction.
What does the oxidation half-reaction show?
The oxidation half-reaction specifically represents the species that loses electrons during the redox process.
What is the primary purpose of using half-reactions to represent a redox reaction?
The primary purpose is to provide a method for constructing a correctly balanced chemical equation for the overall redox reaction.
What is the result of correctly combining the balanced half-reactions?
The result is a single, balanced chemical equation that represents the complete redox reaction.
What does the reduction half-reaction show?
The reduction half-reaction specifically represents the species that gains electrons during the redox process.
What two components are used to construct a balanced redox equation?
Balanced chemical equations for redox reactions are constructed from an oxidation half-reaction and a reduction half-reaction.