The document lists various calcium compounds including calcium carbonate, calcium oxide, and calcium hydroxide. It describes the conversions between these compounds when heated or reacted with water. The characteristics and uses of each compound are provided, such as calcium carbonate reacting with acids to release carbon dioxide gas and its common uses in antacids, building materials, and cement production.

2. List of Calcium Compounds
• Calcium Carbonate (Limestone)
• Calcium Oxide (Quicklime)
• Calcium Hydroxide (Slaked Lime)

3. Natural Calcium Carbonate
Seashells

4. Calcium carbonate – Chalk

5. Natural Calcium Carbonate - Marble

6. Calcium carbonate - Marble

7. Natural marble mountain

8. Natural Calcium Carbonate

11. Conversion of Calcium Compounds
Calcium Carbonate (Limestone)
Calcium Oxide (Quicklime) + CO2
Calcium Hydroxide (Slaked Lime)
Calcium Hydroxide Solution (Lime Water)

14. Characteristics and Uses of
Calcium Carbonate
• Reacts with Acid releasing Carbon Dioxide Gas
• Hard and Insoluble in Water
• Breaks down to Calcium Oxide when Heated
Uses
– Antacids, Calcium Supplements
– Marble tiles, table and floor
– Cement (Calcium carbonate + Clay + Water)
– Make Quicklime
– Extract iron from haematite ore
– Make glass

15. Heating Calcium Carbonate
• Calcium carbonate → Calcium oxide + Carbon dioxide gas

16. Reaction of
Acid and Calcium Carbonate
Hydrochloric acid + Calcium carbonate → Calcium chloride + Carbon dioxide
Sulphuric acid + Calcium carbonate → Calcium sulphate + Carbon dioxide

17. Characteristics and Uses of
Calcium Oxide
• Also Called quicklime
• Produced when calcium carbonate is heated
• Do not break down when heated
• Dissolves in water to form calcium hydroxide
• Turns red litmus blue
• Uses
– Prepare slaked lime
– Make calcium carbide
– As drying agent for ammonia gas

18. Formation of Slaked Lime
Calcium oxide + Water → Calcium hydroxide + Heat energy

19. Characteristics and Uses of
Calcium Hydroxide (Solid)
• Also called slaked lime
• Strong base
• Turns red litmus blue
• Reduce acidity of soil
• Make soda lime
– Neutralize the acidity of water in water treatment
plant
• Prepare lime water to test for presence of carbon
dioxide gas

20. Reduce acidity of soil

21. Characteristics and Uses of
Lime water
• Turns red litmus blue
• Alkaline
• pH>7
• To test for the presence of carbon dioxide gas
• To treat acid burns

22. Treating acid burns