1. Lime Cycle LO: Starter:
Be able to describe the thermal decomposition of calcium carbonate.
Be able to describe the effect of water on calcium oxide.
Know the different uses of the compounds in the limestone cycle.
Starter:
What do chalk, limestone and marble have in common?

2. Chalk

3. Limestone

4. Marble

5. Calcium Carbonate CaCO3
What do chalk, limestone and marble have in common?
Calcium Carbonate
CaCO3

6. What happens when calcium carbonate (CaCO3) is heated?
Carbon Dioxide
CaO
Calcium Oxide
(Quicklime)
heat
Calcium Carbonate
Calcium Oxide + Carbon Dioxide
heat
CaCO3
CaO + CO2

7. Thermal Decomposition
Thermal decomposition is the breakdown of a compound into smaller parts by heating.

8. What happens when calcium oxide is mixed with water?
Ca(OH)2
Calcium Hydroxide
(Slaked Lime)
Calcium Oxide + Water
Calcium Hydroxide
CaO + H2O
Ca(OH)2

9. Calcium hydroxide (slaked lime) when dissolved in water is known as limewater.
H2O
CaCO3
Water O
Calcium Carbonate H
Calcium Hydroxide + Carbon Dioxide
Calcium Carbonate + Water
Ca(OH)2 + CO2
CaCO3 + H2O

10. With a partner, use the computers to find uses for:
Limestone
Building, sculptures, cement, neutralize acidic soil, roads, glass making, toothpaste, paper, paint, plastic, bread and cereal, cosmetics…
Quicklime
Portable food heating, cement, paper …
Slaked Lime
Water treatment, paper, mortar, brake pads …
Limewater
Test for CO2, clean SO2, corn tortillas …