Carbonates

Question 1

What are three main sources?

Answer 1

Chalk
Marble
Limestone

Question 2

How is quicklime manufactured?

Answer 2

Thermal decomposition

Question 3

What is thermal decomposition equation of quicklime?

Answer 3

CaCO3 + heat ⇌ CaO + CO2

Question 4

How is quicklime manufactured?

Answer 4

made in rotary kiln: air blows CO2 out before they combine again

Question 5

What is the limestone cycle?

Answer 5

1. Limestone (CaCO3) + heat
2. Calcium oxide (CaO) + add water
3. Calcium Hydroxide (Ca(OH)2) + dissolve in water
4. Calcium hydroxide solution (limewater) (Ca(OH)2) + bubble carbon dioxide into limewater

Question 6

What is the equation for the addition of water to calcium oxide?

Answer 6

CaO + H2O → Ca(OH)2

Question 7

What are the three uses of quicklime?

Answer 7

Making steel from iron
To neutralise acidity in soil
Drying agent in industry

Question 8

What are the uses of slaked lime and lime?

Answer 8

Neutralise acidity in soil, and in lakes affected by acid rain,
Neutralising acidic industrial waste products, e.g. flue gas desulfurization

Question 9

What is used in the manufacture of cement?

Answer 9

calcium carbonate

Question 10

Describe the manufacture of cement (3)

Answer 10

• In this, limestone/chalk is mixed with clay and heated in a rotary kiln.
• Substance in mixture react producing cement (which is a mixture of calcium aluminate and calcium silicate).
• Made into powder, when used - sprayed with water to make particles hold tight