Sulfur and Sulfuric Acid

Question 1

The ___________ is used to make sulfuric acid.

Answer 1

Contact Process

Question 2

Sources of Sulfur:

Answer 2

• By product of petrochemical industry

* Volcanoes

Question 3

Sulfuric Acid chemical name:

Answer 3

H₂So₄

Question 4

_____________ is the method of extracting sulfur from underground.

Answer 4

Frasch Process

Question 5

What are the conditions for the Contact Process?

Answer 5

• Temperature = 400 - 500 °C
• Pressure = 1 - 2 atm (atmospheres)
• Catalyst = Vanadium (V₂O₅)

Question 6

Step 1 Contact Process

Answer 6

The burning of sulfur to form sulfur dioxide

S + O₂ → SO₂

Question 7

Step 2 Contact Process

Answer 7

The burning of sulfur dioxide to form sulfur trioxide

2SO₂ + O₂ ⇌ 2SO₃

Question 8

Step 3 Contact Process

Answer 8

The dissolving of sulfur trioxide in concentrated sulfuric acid to form oleum
SO₃ + H₂SO₄ → H₂S₂O₇

Question 9

Step 4 Contact Process

Answer 9

The reaction of oleum with water to form sulfuric acid

H₂S₂O₇ + H₂O → H₂SO₄

Question 10

Sodium hydroxide used for:

Answer 10

• Paper

* Bleach

Question 11

Chlorine used for:

Answer 11

• Water treatment

* Bleach

Question 12

Sulfuric acid used for:

Answer 12

• Fertilisers

* Detergents and soaps

Question 13

Half-equation for the reaction at the cathode in the manufacture of sodium hydroxide and chlorine.

Answer 13

2H⁺ + 2e⁻ → H₂

Question 14

Half-equation for the reaction at the anode in the manufacture of sodium hydroxide and chlorine.

Answer 14

2Cl⁻ → Cl₂ + 2e⁻

Question 15

Concentrated sulfuric acid is:

Answer 15

• A powerful dehydrating agent
• A powerful oxidising agent
• Very corrosive