3 - Redox 1
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What is oxidation?
Loss of electrons and hydrogens. Gain of oxygens
What is reduction?
Gain of electrons and hydrogens. Loss of oxygens
What happens it oxidation?
The element looses electrons
What happens in reduction?
The element gains electrons
Example of an oxidising agent?
Halogens and Hydrogen peroxide
Example of a reducing agent?
Reactive metals
Balancing redox equations?
Work out what's oxidised and reduced. Assign oxidation numbers Write 2 1/2 equations to show whats lost/ gained Balance with H+ and H2O Make sure electron charge is the same Add together
Which side of the equation do the lost electrons go on?
Right
Which side of the equation do the gained electrons go on?
left
What are the roman numerals to indicate charge called?
stock notation
What do you do if the electrons are unbalanced?
x the half equation
OIL RIG
oxidation is loss, reduction is gain
Oxidation number of oxygen
• 2 usually - 1 in peroxides
Oxidation number of hyrogen
+1 usually -1 when combined with metals
Oxidation number of aluminium
+3 ALWAYS
oxidation number of flourine
-1 ALWAYS
What does the charge of a lone element indicate?
The oxidation number e.g Fe3+ = +3
What does the charge of a molecule mean?
That the sum of the oxidation numbers how to equal the charge
What do you balance redox equations with?
H+ and H2O