Reduction And Oxidation

Question 1

What is reduction

Answer 1

Gain off electrons

Question 2

What is oxidation

Answer 2

Loss of electrons

Question 3

What is a reducing agent

Answer 3

Loses electrons and gets oxidised
( reducing agent as it provides the electrons for reduction)

Question 4

What is a oxidising agent

Answer 4

Gains electrons and gets reduced

Question 5

Is there an increase or decrease in oxidation number in reduction and oxidation

Answer 5

Reduction= decrease in oxidation number
Oxidation= increase in oxidation number
Eg: 2Na * Cl2 ~ 2Nacl
0 0 +1 -1

Question 6

What is disproportionation

Answer 6

When a species is simultaneously oxidised and reduced in same reaction

Question 7

How do you balance half equations

Answer 7

1- write down species before and after reaction
2- balance any atoms
3- balance oxygens with H2O
4- balance hydrogens with H+
5- balance charges with electrons

Question 8

How do you combine half equations

Answer 8

1- multiply one half equation so that electrons balance
2- cancel electrons and combine equations
3- final ionic equations have no electrons
- both reduction and oxidation shown

Question 9

What is the only time oxygen is not 2- when calculating oxidation numbers

Answer 9

Peroxides