Redox Flashcards
What is the oxidisation state of an element?
A measure of how oxidised that element is or the charge on the ion
What is the definition of oxidation?
-Loss of electrons
What is the definition of reduction?
-Gain of electrons
What is a reducing agent
-Loses electrons (is oxidised)
-Electron donator
What is an oxidising agent?
-Gains electrons (is reduced)
-Electron acceptor
In a neutral compound the sum of the oxidation state is equal to…
Zero
In a molecular ion the sum of the oxidation states is equal to the…
Overall charge
Any uncombined element has an oxidation state of…
0
Group 1 method in compounds have a ….. oxidation state
+1
Group 2 metals in compounds have a…
+2 oxidation state
What oxidation state does aluminium, iron (III) etc. have?
+3
What is the oxidation state of hydrogen in compounds (except metal hydrides)
+1
What is the oxidation state of hydrogen in metal hydrides? (e.g NaH)
-1
What is the oxidation of fluorine?
-1
Oxygen has a ……… oxidation state in compounds, oxides (except in compounds with F)
-2
Oxygen in peroxides has a… (H2O2)
-1 oxidation state
Oxygen in superoxides has an oxidation state of…
-1/2
Chlorine in compounds (except in compounds with O or F) has an oxidation state of…
-1
How do you name oxoanions?
-Identify no. Of oxygen atoms
-identify total oxidation state due too oxygen
-identify charge of ion
-identify central atom oxidation state
Oxidation means an ……….. in oxidation state
Increase
Reduction means a ………. In oxidation state
Decrease
How do you balance more complex half equations?
- Check the element that isn’t oxygen is balanced
2.Balance for oxygen by adding water
3.Balance for hydrogen by adding H+ - Balance charge by adding electrons
To combine half equations electrons must…
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