Halogens React with Alkanes, Forming Haloalkanes

Question 1

What can halogens react with alkenes to make?

Answer 1

Haloalkanes

Question 2

For example, bromine and ethene can react together to form…

Answer 2

Dibromoethane

Question 3

Symbol equation for dibromoethane?

Answer 3

H. H. Br Br
C=C. + Br2 —> H-C-C-H
H. H. H H

Question 4

Word equation for dibromoethane?

Answer 4

Ethene + bromide —> dibromoethane

Question 5

Why are these called addition reactions?

Answer 5

Because the C=C double bond is split and a halogen atom is added to each of the carbons

Question 6

What is often used as a test for carbon-carbon double bonds?

Answer 6

Bromine and alkenes

Question 7

What happens when you shake an alkenes with orange bromine water?

Answer 7

The solution becomes colourless

Question 8

Why does this happen?

Answer 8

Because the bromine molecules, which are orange, are reacting with the alkene to make a dibromoalkane, which is colourless