Alkenes

Question 1

What is the general formula for alkenes?

Answer 1

CnH2n

Question 2

Why is alkenes classified as unsaturated hydrocarbons?

Answer 2

Because it contains double C-C bonds

Question 3

What functional group an alkenes contain?

Answer 3

A double C=C bond
>C=C<

Question 4

What is the structural and molecular formula for ethene?

Answer 4

CH2=CH2
C2H4

Question 5

What is the structural and molecular formula for propene?

Answer 5

CH2=CH-CH3
C3H6

Question 6

What is the structural and molecular formula for but-1-ene?

Answer 6

CH2=CH-CH2-CH3
C4H8

Question 7

What is testing for alkenes?

Answer 7

Alkenes decolourise bromide water (bromine water turn from orange to colourless )

Question 8

What is produced when an alkene reacts with bromine?

Answer 8

Produce dibromoalkenes

Question 9

What is produced when ethene reacts with bromine?

Answer 9

Dibromoethane

Question 10

What is a polymer ?

Answer 10

Polymerisation is when lots of small molecules, knows as monomers, join together in a long chai to form one big polymer

Question 11

How can bromine water be used to distinguish between an alkane and an alkene ?

Answer 11

If there is presence of an alkene bromine water turns colourless, whereas alkane keeps it orange

Question 12

What is the structural and molecular formula for but-2-ene?

Answer 12

CH3CH=CHCH3