Chemistry In The Industry- Triple

Question 1

Sulfuric acid is used in

Answer 1

1. Making fertilisers

2. Making detergents and paint

Question 2

Describe the contact process

Answer 2

1. Make sulfur dioxide
2. Make sulfur trioxide
3. Make sulfuric acid

Question 3

Making sulfur dioxide

Answer 3

1. Burn sulfur in air

2. Heat sulfur ores strongly in air

Question 4

Making sulfur trioxide

Answer 4

1. Vanadium oxide catalyst
2. 2 atm
3. 450 degrees
4. Excess oxygen- to ensure as much sulfur dioxide has been converted to sulfur trioxide as it could cause a dangerous pollution

Question 5

Making sulfuric acid

Answer 5

1. Sulfur trioxide is dissolved in concentrated oleum(fuming sulfuric acid)
2. Reacts with water to make sulfuric acid- twice as much as originally used to make fuming sulfuric acid

Question 6

Products of electrolysis of brine

Answer 6

1. Hydrogen- given off at cathode and two ions accept two electrons to make one hydrogen molecule
2. Chlorine gas- given off at anode, two chlorine ions lose their electrons to become one chlorine molecule
3. Sodium ions- sodium and hydroxide ions stay in the solution to make sodium hydroxide

Question 7

Useful products of electrolysis of brine

Answer 7

1. Chlorine- sterilises water supplies
2. Hydrogen- for Haber process and making margarine
3. Sodium hydroxide- making soap, paper pulp and bleach