Oxidation and Reduction

Question 1

What is Reduction
‘

Answer 1

when substance:
-lose oxygen
-gain hydrogen
-gain electrons
-decreases its oxidation state after a reaction

Question 1

What is Oxidation
‘

Answer 1

when substance:
-gain oxygen
-lose hydrogen
-lose electrons
-increases its oxidation state after a reaction

Question 2

Redox reaction is…

Answer 2

reaction which involves the oxidation of a substance and the reduction of another substance

Question 3

What is oxidation state?

Answer 3

charge of an atom of an element would have if it existed as an ion in a compound

Question 4

Rule of oxidation state:
Oxidation state of an element is…

Answer 4

0. ZERO.

Question 5

Rule of oxidation state:
Oxidation state of a simple ion

Answer 5

is the same as the charge on the ion
E.G. Li+ oxidation state =+1

Question 6

Rule of oxidation state:
Oxidation states of the atoms or ions in a compound add up to

Answer 6

ZEROOOO
E.G. Mg 2+, O2- =MgO (0)

Question 7

Rule of oxidation state:
sum of oxidation states of the atoms in a polyatomic ion is the same as…

Answer 7

the charge of the ion
E.G. OH- = O2- + H+

Question 8

Non-REDOX reactions:

Answer 8

neutralisation
precipitation

Question 9

What is a oxidising agent?

Answer 9

a oxiding agent is a substance that causes another substance to be oxidised

Question 10

What is a reducing agent?

Answer 10

a reducing agent is a substance that causes another substance to be reduced

Question 11

How to test for oxidising agent?

Answer 11

add potassium iodide
brown solution formed proves that iodide ions are oxidised by oxidising agent