alkenes and ethanol

Question 1

do alkenes have a doubble or single carbon bond?

Answer 1

doubble

Question 2

what are some facts about alkenes?

Answer 2

• carbon atoms always make four bonds

- hydrogen atoms only make one bond

Question 3

how can you test for an alkene?

Answer 3

using bromine water- an alkene will de-colourise the bromine water.

Question 4

how can you make ethanol with ethene?

Answer 4

react the ethene with steam

Question 5

advantages of producing ethanol from ethene.

Answer 5

• this is cheap

- not must is wasted.

Question 6

disadvantages of producing ethanol from ethene.

Answer 6

• ethene is made from crude oil which is non renewable

- it could get very expensive in the future

Question 7

can ethanol be produced from renewable resources?

Answer 7

yes

Question 8

how is the alcohol in beer and wine produced?

Answer 8

fermentation

Question 9

the raw material for fermentation is sugar. how is this converted into ethanol?

Answer 9

using yeast

sugar—–>carbondioxide+ethanol

Question 10

give an advantage of fermentation over using ethene

Answer 10

• needs a lower temperature
• uses simpler equipment
• the raw material is a renewable resource
• can be sold to poorer countries as a fuel quite cheaply

Question 11

give a disadvantage of fermentation

Answer 11

• it needs to be purified

- it isn’t very concentrated so you need to increase its strength