✅3 - Redox I
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What is a redox reaction?
One which involved reduction and oxidation
What is an oxoanion?
An ion with oxygen within it, formed by both metals and non metals
What is a half equation?
An ionic equation used to describe either the loss or gain of electrons during a redox reaction
What are displacement reactions?
Redox reactions which can be used to compare the relative strengths of metals as reducing agents and non-metals as oxidising agents.
What are spectator ions?
Ions which are present in solution but take no part in the reaction
If the oxidation number gets more positive the compound has been…
…oxidised
If the oxidation number of a compound decreases, it has been…
…reduced
The oxidation of all uncombined elements is…
…zero
If an ion is made of one element, the oxidation number is…
… the charge on the ion
The sum of the oxidation numbers in a neutral compound is…
…zero
The sum of oxidation numbers or an ion is…
…the charge on the ion
What are the oxidation numbers for group 1 elements?
+1
What happens to oxidising agents?
They oxidise other species while themselves being reduced
What happens to reducing agents?
They reduce other species while themselves being oxidised
What happens to metals when they form compounds?
They generally donate electrons to form positive ions
What happens to non-metals when they form compounds?
They generally gain electrons to form negative ions
What can be used to balance half equations?
H+, H2O and e-
Why would you use H2O to balance a half equation?
If there were more Oxygen on one side unaccounted for, or more Hydrogen
How can you balance charges in half equations?
By adding electrons to the more positive side
When would you use H+ to balance a half equation?
To balance the hydrogen after water has been added
When combining half equations, what should you make sure?
That the number of electrons in each are the same, multiplying them if need be