Sulfur (C12)

Question 1

Name 4 sources of Sulfur

Answer 1

Element in large underground beds
Rims of volcanoes
Metal ores (lead sulphate)
Naturally in fossil fuels (coal)

Question 2

Name 4 uses of sulphur and 3 uses of sulphur dioxide

Answer 2

Sulphur:
Food preserver; kills bacteria
Bleach in manufacture of wood pulp for paper
Car batteries
Manufacture of sulphuric acid (contact process)

Sulphur dioxide:
Manufacture of sulphuric acid
BLeach wool/silk/wood pulp for making paper
Sterilising agent in making soft drinks and jam/drying fruit; stops growth of bacteria and molds

Question 3

What is the Contact Process

Answer 3

Used to make sulphuric acid

Question 4

Describe the process of manufacturing sulphuric acid through the Contact Process

Answer 4

Sulphur is burned in air producing sulphur dioxide
Mixed with more air and passed over to four separate beds of catalyst: vanadium oxide, at 450 degrees celsius to form sulphur trioxide
Dissolved in concentrated sulphuric acid, forming thick fuming liquid called oleum
Mixed carefully with water to form concentrated sulphuric acid

Question 5

What is oleum

Answer 5

Dense, corrosive liquid consisting of concentrated sulphuric acid and excess sulphur trioxide in solution

Question 6

What are the 3 essential conditions of the Contact Process

Answer 6

Catalyst: Vanadium (V) oxide
Temperature: 450 degrees C
Pressure: 2 atm

Question 7

What are the 4 properties of Sulphuric acid

Answer 7

Forms salts called sulphates
Dehydrating agent and a thick oily liquid when concentrated
Turns blue litmus paper red
Strong acid: reacts with bases, low pH, high conductivity