Redox I

Question 1

What is oxidation number

Answer 1

the charge that would exist on an individual atom if the bonding were completely ionic

Question 2

oxidation number of
group 1 element
group 2 element
Halogens
Hydrogen and the exception
Oxygen and the exception

Answer 2

+1
+2
-1
+1 but in hydrides (NaH) -1
-2 but in peroxides -1 and in F2O +2

Question 3

what is an oxidising agent

Answer 3

substance that oxidises another atom or ion by causing it to lose electrons and gets reduced itself

Question 4

what is a reducing agent

Answer 4

a substance that reduces another atom or ion by causing it to gain electrons

A reducing agent itself gets oxidised – loses / donates electrons

Question 5

what is a disproportionation reaction

Answer 5

a reaction in which the same species is simultaneously oxidised and reduced

Question 6

how can you work out the roman numeral

Answer 6

find the oxidation number of that atom

Question 7

steps for balancing half equations

Answer 7

seperate the atoms
balance each kind of atom other than H and O
balance O atoms by using H2O
balance H atoms using H+
use electrons as needed to obtain a balanced charge when joining the atoms back

Question 8

oxidation number of CN

Answer 8

-1