Topic 6 - 6.3 - Alkenes and Addition Reactions

Question 1

Explain your answer

Alkenes are
a. saturated
b. unsaturated

Answer 1

b. unsaturated
* allows them to take part in addition reactions.

Question 2

Define the term ‘addition reaction’ AND name the 5 types.

Answer 2

• When one molecule reacts with another to form a larger molecule with no other products.

1. Hydrogenation
2. Halogenation
3. Bromination (part of halogenation)
4. Hydration
5. Addition polymerisation

Question 3

Describe the process of Hydrogenation

Answer 3

Alkenes react with hydrogen to produce alkanes

Question 4

Describe the process of Halogenation

Answer 4

Adding halogens to alkenes to make alkanes

Question 5

Describe the process of Bromination

Answer 5

Used to test for molecules that contain double bonds because only they can cause bromine to decolourise rapidly.

Double bonds present? = Bromine goes from orange to colourless

Question 6

Describe the process of Hydration

Answer 6

Water is added to alkenes to produce alcohols

Question 7

Finish the sentence

Alkenes are ____ in water, and ________ in organic solvents

Answer 7

insoluble, soluble

Question 8

How do alkenes form isomers?

Answer 8

Moving the position of the double bond.

Question 9

List the first 8 alkenes

Answer 9

1. Ethene
2. Propene
3. Butene
4. Pentene
5. Hexene
6. Heptene
7. Octene
8. Nonene