Topic 3 -redox

Question 1

what is oxidation?

Answer 1

is the process of electron loss

• gain of oxygen
• loss of hydrogen

Question 2

What is reduction?

Answer 2

• the process of electron gain.
• loss of oxygen
• gain of hydrogen

Question 3

What is disproportiation?

Answer 3

is the name for a reaction where an element in a single species is simultaneously oxidised and reduced.

Question 4

What is a reducing agent?

Answer 4

-it is an alectron donor.

a reducing agent is the species that causes another element reduce. it is itself oxidised in the reaction.

Question 5

What is an oxidising agent?

Answer 5

• it is an electron acceptor

- an oxidising agent is the species that causes another element to oxidse. it itself reduced in the reaction.

Question 6

What causes an element in a compound to have a negative oxidation number?

Answer 6

being more electronegative

Question 7

How to name a compound using oxidation numbers

Answer 7

Provide the oxidation number of the unknown element e.g. sulfur(vi) oxide for SO3

Question 8

How to form an equation using oxidation numbers?

Answer 8

• form an ionic half equation for the element that changes oxidation, ignoring other elements
• balance the charge of the reactants using H+ for acid and OH- for base
• add water to the products