Topic 9: Alcohols

Question 1

Bond angle in alcohols

Answer 1

105 degrees between the O and the H

Question 2

Physical properties of alcohols

Answer 2

OH group means it has higher melting and boiling points than alkenes
Short chains are hydrophilic

Question 3

Conditions for reacting ethene with steam

Answer 3

300 degrees
60-70 ATM pressure
Phosphoric acid catalyst

Question 4

Ethanol uses

Answer 4

Used as an intermediate
Cosmetics- aftershaves and perfumes
Manufacture of drugs

Question 5

Conditions for fermentation (formation of alcohol)

Answer 5

Temperature of 35 degrees
ATM pressure
Anaerobic conditions

Question 6

Hydration of ethene vs fermentation

Answer 6

Fast vs slow
Continuous vs batch
Pure vs impure

Question 7

Ethanol as a fuel for cars
Pros vs cons

Answer 7

Renewable energy source
Petrol cars would have to be modified
Land used to grow food is taken up
They’re not 100 percent carbon neutral

Question 8

Oxidation of primary alcohols

Answer 8

Form aldehydes and then carboxylic acids

Question 9

Oxidation of secondary alcohols

Answer 9

Produce ketones

Question 10

Testing for aldehydes

Answer 10

Fehlings- Will form a brick red precipitate
Tollens- Add tollens and a silver mirror will for m

Question 11

Defenition of biofuel

Answer 11

A fuel which is derived from living matter

Question 12

Defenition of carbon-neutral

Answer 12

A fuel which when used has no net increase on the amount of CO2 in the atmosphere

Question 13

Which alcohold cant be oxidised?

Answer 13

Tertiary alcohols

Question 14

What happens to the Chromate ions during oxidation of alcohols

Answer 14

The Cr6+ is reduced to Cr3+