Redox Flashcards
What is oxidation
Loss of electrons
What is reduction
Gain of electrons
Definition of oxidation number
The charge that an atom would have if the bonding were completely ionic
Oxidation numbers of simple ions (Na K H Mg Ca Pb Cl Br I O S)
Same as whatever their charge would be
How to calculate oxidation of an ion when not given
Positive / negative opposite of the other atom in the ion
Oxidation number of an unconvinced ELEMENT
0
Group one oxidation number is always
+1
Fluorine oxidation number is always
-1
Which element in an ion will have the negative value
Whichever one is more olectronegative
what is an oxidising agent
A SUBSTANCE THAT OXIDISES another atom or ion by causing it to lose electrons
oxidation agents are always reduced
so oxidation number of them always increases
what is a reducing agent
a substance that reduces another atom or ion by causing it to gain electrons
a reducing agent gets oxidised
so the oxidation number increases
disproportionation reaction definition
a reaction in which the same species is simultaneously oxidised and reduced
what do the roman numerals in a name mean
the oxidation number of the partially positive ion
what genrally happens to metals and reaction between sodium and water
form positive ions by losing electrons
therefore their oxidation number increases
eg. 2Na (s) + H2O (l) → 2NaOH (aq) + H2 (g)
what genrally happens to non metals
eg. NA and O2
gain electrons
reducing oxidation number
4Na (s) + O2 (g) → Na2O (s)
