What does a redox couple associate?
An oxidant and a reductant derived from the same chemical element.
How is a redox couple written?
Oxidant/reductant.
What does an oxidant do with electrons?
It gains electrons to become its conjugate reductant.
What does a reductant do with electrons?
It gives up electrons to become its conjugate oxidant.
What does an electron half-equation represent for a redox couple?
The transfer of electrons for one oxidizing-reducing couple.
What is the general model for an electron half-equation?
In an electron half-equation, what does represent?
The number of electrons captured.
When balancing a half-equation, what should be balanced before the charges?
The chemical elements.
Where are electrons added when balancing the charge of an oxidant half-equation?
On the oxidant’s side.
What does an oxidation-reduction reaction involve, and what must its equation satisfy?
An oxidant from one redox couple reacts with a reductant from another, and the equation must be balanced.
What is the first step in establishing an oxidation-reduction equation?
Identify the reactants in the statement.
How should half-equations be oriented when establishing a redox equation?
In the direction of the reaction.
What must be equalized before combining redox half-equations?
The numbers of transferred electrons.
What is done to electrons after combining redox half-equations?
They are simplified.
What happens to an oxidizing agent when it accepts electrons?
It is reduced.
What happens to a reducing agent when it donates electrons?
It is oxidized.
Which redox couples involve silver ions and metallic silver?
Ag⁺/Ag.
Which redox couples involve copper(II) ions and metallic copper?
Cu²⁺/Cu.
What is the balanced half-equation for the Ag⁺/Ag couple?
Ag⁺ + e⁻ → Ag.
What is the balanced half-equation for the Cu²⁺/Cu couple?
Cu²⁺ + 2 e⁻ → Cu.
How should half-equations with different electron counts be multiplied?
Multiply each by the electron count of the other half-equation.
What is the balanced silver-copper redox equation?
What do (aq) and (s) indicate in the silver-copper example?
(aq) indicates ions in solution, and (s) indicates solid metals.
In the silver–copper reaction, which species is the oxidizing agent?
Ag⁺.
In the silver–copper reaction, which species is the reducing agent?
Cu(s).
What happens to Ag⁺ in the silver–copper reaction?
It is reduced.
What happens to Cu(s) in the silver–copper reaction?
It is oxidized.
Answer 11 questions on Oxydoréduction et demi-équations.
1. How is a redox couple formed and conventionally written?
2. In a reaction, species X gains electrons and becomes its conjugate reduced form; what role does X play?
Go over the full study guide for Oxydoréduction et demi-équations.
Read the study guide →Upload your class notes and Revizly writes your flashcards in about a minute.
Flashcard maker