4.3 - Redox

Question 1

What happens when oxidation/reduction occurs?

Answer 1

Electrons are transferred.

Question 2

OILRIG

Answer 2

Oxidation is loss of electrons.

Reduction is gain of electrons.

Question 3

What happens when something is oxidised?

Answer 3

It loses electrons.

Question 4

What happens when something is reduced?

Answer 4

It gains electrons.

Question 5

What are reducing agents?

Answer 5

Something that reduces another species.

Loses electrons, so is oxidised.

Question 6

What are oxidising agents?

Answer 6

Something that oxidises another species.

Gains electrons, so is reduced.

Question 7

Oxidation number of uncombined element

Answer 7

0

Question 8

Oxidation number of Group 1

Answer 8

always +1

Question 9

Oxidation number of Group 2

Answer 9

always +2

Question 10

Oxidation number of Aluminium

Answer 10

always +3

Question 11

Oxidation number of Flourine

Answer 11

always -1

Question 12

Oxidation number of Flourine

Answer 12

always -1

Question 13

Oxidation number of Hydrogen

Answer 13

+1 (unless in hydrides e.g. NaH)

Question 14

Oxidation number of Chlorine

Answer 14

-1 (unless in a compound with F or O)

Question 15

Oxidation number of Oxygen

Answer 15

-2 (unless in a peroxide or OF₂)

Question 16

What happens to oxidation number in reduction?

Answer 16

Oxidation number is decreased.

Question 17

What happens to oxidation number in oxidation?

Answer 17

Oxidation number is increased.