Unit: 3 - alkenes

Question 1

What are alkenes used to make?

Answer 1

Alkenes are used to make polymers and alcohols

Question 2

Are alkenes soluble or insoluble?

Answer 2

are insoluble in water

Question 3

Do alkenes have a single bond or double bond between carbons?

Answer 3

contain the C=C double bond functional group

Question 4

What is the general formula for alkenes?

Answer 4

can be represented by the general formula CnH2n

Question 5

What is an alkene?

Answer 5

alkenes are a homologous series of unsaturated hydrocarbons

Answer 6

Straight-chain and branched alkenes can be systematically named indicating the position of the double bond, from structural formulae containing no more than eight carbon atoms in the longest chain.

Question 7

What is an isomer?

Answer 7

are compounds with the same molecular formula but different structural formulae;

may belong to different homologous series;

usually have different physical properties.

Question 8

How do we test for saturation?

Answer 8

compounds containing only single carbon-carbon bonds are described as saturated;

compounds containing at least one carbon-carbon double bond are described as unsaturated;

compounds containing carbon-carbon double bonds can take part in addition reactions - in an addition reaction, two molecules combine to form a single molecule;

it is possible to distinguish an unsaturated compound from a saturated compound using bromine solution;

unsaturated compounds decolourise bromine solution quickly.