redox Flashcards
1
Q
what is redox
A
oxidation = losing electrons
reduction = gaining electrons
2
Q
what are the oxidation number rules
A
Elements on their own - oxidation number= 0
Fluorine when combined in a compound = -1
Hydrogen when combined in a compound = +1
3
Q
sum of oxidation numbers
A
in neutral molecules = 0
In compound ions, the sum of the oxidisation. numbers is equal to the charge on the ion
e.g state of P in PO43- is 5
4
Q
what is an oxidising agent
A
gains electrons/ is reduced
5
Q
what is a reducing agent
A
loses electrons/ is oxidised
6
Q
redox reactions in metals with acids
A
reactive metals react with acids to form : salts and hydrogen
7
Q
A
