REDOX

Question 1

Define the oxidation number of an element

Answer 1

A measure of the number of electrons that an atom uses to bond with atoms of another element

Question 2

What is the oxidation numbers in a neutral compound?:

Answer 2

0

Question 3

What is the oxidation number of oxygen in compounds?

Answer 3

-2 (except in peroxides such as hydrogen peroxide, is -1)

Question 4

What is the oxidation number of hydrogen in compounds?

Answer 4

-1 (except in hydrides such as LiH, is -1)

Question 5

What is the oxidation of (in a compound):

• Group 1 element
• Group 2 element
• Group 3 element
• Group 7 element

Answer 5

• Group 1 = +1
• Group 2 = +2
• Group 3 = +3
• Group 7 = -1

Question 6

Define a redox reaction

Answer 6

A reaction where both oxidation and reduction take place

Question 7

What is oxidation?

Answer 7

The loss of electrons/an increase in oxidation number

Question 8

What is reduction?

Answer 8

The gain of electrons/a decrease in oxidation number

Question 9

What is an oxidising agent?

Answer 9

A reagent that oxidises (takes electrons from) another species

Question 10

What is a reducing agent?

Answer 10

A reagent that reduces (adds electrons to) another species