Redox

Question 1

Define oxidation in terms of electrons, oxygen and hydrogen

Answer 1

Addition of oxygen
Loss of hydrogen
Loss of electrons

Question 2

Define an oxidising agent

Answer 2

A substance that oxidises another atom or ion by causing it to lose electrons.
It gets reduced itself and gains electrons therefore the oxidation state decreases

Question 3

Define reduction in terms of electrons, oxygen and hydrogen

Answer 3

Loss of oxygen
Addition of hydrogen
Gain of electrons

Question 4

Define a reducing agent

Answer 4

A substance that reduces another atom or ion by causing it to gain electrons.
It gets oxidised itself and loses electrons, therefore the oxidation state increases

Question 5

What is the rule to assigning oxidation states?

Answer 5

All uncombined elements have an oxidation state of zero

The oxidation number of the elements in a compound add up to zero

The oxidation number if a monoatomic ion is equal the ionic charge

Question 6

Write a half equation for the formation of chlorine from chloride ions

Question 7

Write a half equation for the formation of sulfur dioxide from sulphuric acid

Question 8

Combine the half equation of chlorine from chloride and sulfur dioxide from sulphuric acid to form an overall redox equation