Alkene Reactions

Question 1

What is the reaction with oxygen called?

Answer 1

Combustion Reaction

Question 2

Alkene + Oxygen –> ________ + ________ + ________ + ________

Answer 2

Carbon Dioxide + Carbon Monoxide + Carbon + Water

Question 3

What do all alkenes contain?

Answer 3

A carbon double bond:

C=C

Question 4

What is a homologous series?

Answer 4

A series of compounds with the same functional groups and similar chemical properties.

Question 5

What is an unsaturated hydrocarbon?

Answer 5

It has at least 1 double carbon bond.

Only contains hydrogen and carbon atoms.

Question 6

What is the general formula for an alkene?

Answer 6

CnH2n

Question 7

What is the general formula for an alkane?

Answer 7

CnH2n+2

Question 8

Alkene + Hydrogen –> ________

Answer 8

Alkane

Question 9

What conditions does this reaction need?

Alkene + Hydrogen

Answer 9

Nickel Catalyst
High temperature (150 degrees C)

Question 10

What type of combustion occurs when an alkene is burned?

Answer 10

Incomplete combustion

Question 11

How can we tell the difference between complete and incomplete combustion?

Answer 11

Complete combustion produces a clean blue flame.

Incomplete combustion produces an orange flame and soot (carbon).

Question 12

Propene + Hydrogen –> ________

Answer 12

Propane

Question 13

Ethene + Water (Vapour) –> ________

Answer 13

Ethanol

Question 14

What conditions are needed for this reaction:

Ethene + Water (Vapour)

Answer 14

Acidic Catalyst

Question 15

What is this reaction most commonly used for:

Ethene + Water (Vapour)

Answer 15

Alcoholic drinks
Polishes
Plastics

Question 16

What is the test for alkenes?

Answer 16

Bromide water will turn from an orange/brown to a clear solution if alkenes are present.

Question 17

Ethene + Bromine –> ________

Answer 17

Dibromoethane

Question 18

What happens if an alkane is added to bromine water?

Answer 18

Nothing happens as the bromine will not react with the alkane.