Organic chemistry

Question 1

Define homologous series

Answer 1

A group of organic molecules

Question 2

Define hydrocarbon

Answer 2

A compound which contains only carbon and hydrogen atoms

Question 3

Define fractional distillation

Answer 3

To separate the hydrocarbons molecules in petroleum into groups that have similar boiling points

Question 4

What about the viscosity?

Answer 4

Viscosity (glueyness) of the liquids also increases with the number of carbon atoms.

Question 5

Describe methane

Answer 5

The main constituent of natural gas

Question 6

Define cracking

Answer 6

The thermal decomposition of alkanes - produces alkenes. A catalyst is often used

Question 7

What are the conditions for cracking?

Answer 7

• Aluminium oxide as catalyst

- 400-500C

Question 8

Describe the chemical properties of alkanes

Answer 8

• Unreactive compounds

- alkanes burn with a clean blue flame if there is plenty of oxygen or air present

Question 9

Alkene is

Answer 9

unsaturated hydrocarbons because they have double bond

Question 10

Alkane is

Answer 10

saturated hydrocarbons