Chemistry /Edexcel A Level Chemistry: 3: Redox I
What is a redox reaction?
One which involved reduction and oxidation
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Key Terms
Term
Definition
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
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Term | Definition |
---|---|
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 |