C9

Question 1

What is the general alkane formula?

Answer 1

CnH(2n+2)

Question 2

How does fractional distillation of crude oil work?

Answer 2

1. CO is heated and fed into the bottom of the column
2. The column is hot at the bottom and cold at the top
3. The gases move up the column and the hydrocarbons condense when they reach their boiling points

Question 3

What do you get from a fraction column from bottom to top?

Answer 3

Diesel, kerosene, gasoline, petroleum gas

Question 4

What are the products of complete combustion of a hydrocarbon?

Answer 4

CO2 and H2O

Question 5

What are the products of incomplete combustion of a hydrocarbon?

Answer 5

CO2 + H2O + CO

Question 6

What is cracking?

Answer 6

When larger, less useful hydrocarbon molecules are broken down into smaller, more useful ones

Question 7

What happens in a cracker?

Answer 7

A heavy fraction distilled from crude oil is heated to vaporise the hydrocarbons.
The vapour is either passed over a hot catalyst or mixed with steam and heated to very high temperatures

Question 8

What is a positive test for an unsaturated hydrocarbon?

Answer 8

If it turns ORANGE bromine water COLOURLESS