Oxidative States
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In an oxidative + romance numeral question what is the charge of the Roman numeral ?
The roman numeral is always positive
What is a redox reaction?
This is when oxidation and reduction occurs at the same time
What are the 3 differs ways oxidation can occur?
It can be gained or oxygen Can be loss of hydrogen Can be loss of electrons (OILRIG)
What are the 3 different ways reduction can occur?
Can be the loss of oxygen Can be the gain of electrons And the gain of hydrogen
What is reduction and oxidation in terms of oxidative states ?
Reduction is the reduction in oxidative state whilst oxidation is an increase in oxidative state
What is the oxidative state/number of an element?
It is the number of electrons in an element involved in bonding (with other electrons)
What are the 5 rules of an oxidation state ?
1)species in their elemental form :their oxidatiev number =0 2)fluoride (reacted fluorine) = always -1 eg NaF 3)reacted hydrogen = +1 eg HCl (except with metals its = -1 eg NaH) 4)oxide (reacted oxygen) = -2 (except in peroxides - H2O2) 5)reacted group 1,2&3 metals = always the group number (+1,+2&+3)
What is a disproportionation reaction?
This is a reaction in which an element is both oxidised and reduced
In a reaction what numbers matter ? (Referring to the context of oxidation states)
The big number don’t matter only the small numbers do
What does the roman numeral charge refer to in a compound?
The ion of the compound eg FeO (vi) the (vi) refers to the charge of Fe