Alkenes

Question 1

What are alkenes?

Answer 1

Hydrocarbons which have a C=C double bond between the carbon atoms in their chain.

Question 2

Why are alkenes known as ‘unsaturated’?

Answer 2

Because they can make more bonds.

Question 3

What are the first two alkenes?

Answer 3

Ethene (with two carbon atoms)

and

Propene with (with three carbon atoms)

Question 4

General formula for alkenes:

Answer 4

CnH2n

-they have twice as many hydrogens as carbons.

Question 5

What is the test for alkene?

Answer 5

1. add the substance to bromine water
2. an alkene will turn it from orange to colourless
3. this is beacause the double bond has opened up and formed bonds with the bromine.