Alkenes

Question 1

What is different about alkenes?

Answer 1

They contain a carbon-carbon double bond.

Question 2

Are they saturated or unsaturated molecules?

Answer 2

Unsaturated

Question 3

What does unsaturated mean?

Answer 3

They can make more bonds - the double bond can open up, allowing the two carbon atoms to bond with other atoms.

Question 4

What are the first 3 alkenes?

Answer 4

Ethene, propene, and butene

Question 5

What is the general formula of alkenes?

Answer 5

CnH2n

Question 6

What are the 2 forms of butene

Answer 6

But-1-ene and but-2-ene

Question 7

What is formed when halogens react with alkenes?

Answer 7

Haloalkenes

Question 8

Ethene + bromine –>

Answer 8

Dibromoethane

Question 9

What type of reactions are these?

Answer 9

Addition reactions because they double carbon-carbon bond is split and the halogen atom is added to each of the carbons.

Question 10

How to test for an alkene

Answer 10

Add bromine water - the solution will turn clear and colorless from orange. Alkanes don’t react with bromine water as they don’t have a double bond. Therefore, if you add an alkane to bromine water, the solution will stay orange.