Unit 3.2.4 - Redox Reactions

Question 1

What does oxidation mean?

Answer 1

Oxidation is loss of electrons

Question 2

What does reduction mean?

Answer 2

Reduction is gain of electrons

Question 3

How can you remember what oxidation and reduction mean?

Answer 3

OILRIG

Question 4

What are oxidising agents?

Answer 4

They are electron acceptors and become reduced

Question 5

What are reducing agents?

Answer 5

They are electrons donors and get oxidised

Question 6

What is a redox reaction?

Answer 6

Where one molecule is reduced and another is oxidised during a reaction

Question 7

What is meant by oxidation state of an element?

Answer 7

The total number of electrons which it needs to gain or lose to go to an oxidation state of zero

Question 8

What is another word for oxidation state?

Answer 8

Oxidation number

Question 9

What is the oxidation state of uncombined elements?

Answer 9

0

Question 10

What is the oxidation state of elements bonded to identical atoms?

Answer 10

0

Question 11

What is the oxidation state of group 1 metals in a compound?

Answer 11

+1

Question 12

What is the oxidation state of group 2 metals in a compound?

Answer 12

+2

Question 13

What is the oxidation state of oxygen in a compound (most common)?

Answer 13

-2

Question 14

What are the two exceptions for the oxidation state of oxygen?

Answer 14

When it is in a peroxide and when it is bonded to fluorine

Question 15

What is the oxidation state of oxygen when in a peroxide?

Answer 15

-1

Question 16

What is the oxidation state of oxygen when bonded to fluorine?

Answer 16

+2

Question 17

What is the oxidation state of hydrogen in a compound with non-metals?

Answer 17

+1

Question 18

What is the oxidation state of hydrogen in a compound with metals?

Answer 18

-1

Question 19

What is the oxidation state of aluminium?

Answer 19

+3

Question 20

What is the oxidation state of fluorine?

Answer 20

-1

Question 21

What do ionic half equations show?

Answer 21

Oxidation or reduction

Question 22

What are the four steps for working our more complex half equations?

Answer 22

1. ) balance out the atom that is either being reduced or oxidised
2. ) balance out the O’S by adding water
3. ) balance out the H’S by adding H+ ions
4. ) then balance out the charge by adding electrons

Question 23

What two equations can you combine to get a full redox reaction?

Answer 23

Oxidation half equation and redox half equation

Question 24

What are the two steps for combing oxidation and reduction half equations?

Answer 24

1. ) Make the number of electrons the same in each equation

2. ) Then combine the two equations cancelling out the electrons

Question 25

What is a disproportionation reaction?

Answer 25

One where a species is both simultaneously oxidised and reduced

Question 26

If electrons are on the same side of the equation as the species is the species being oxidised or reduced and what type of an agent is it?

Answer 26

Reduced and it is an oxidising agent