Lime Cycle LO: Starter:

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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?

Chalk

Limestone

Marble

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

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

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

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

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

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 …