The Limestone Cycle and its uses.
- Created by: beckymale
- Created on: 17-05-16 20:07
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- LIMESTONE CYCLE C1
- Calcium Carbonate - CACO3
- LIMESTONE.
- HEATED with CLAY makes CEMENT
- CEMENT mixed with SAND to make MORTAR
- CEMENT with SAND and AGGREGATE makes CONCRETE.
- Cement is quick and cheap. Hideously unattractive.
- Doesn't corrode. But has LOW TENSILE STRENGTH. It can crack, but steel bars can reinforce it.
- Cement is quick and cheap. Hideously unattractive.
- ADVANTAGE: provides HOUSES and ROADS. DYES, PAINTS and MEDICINES from limestone. NEUTRALISEmore jobs, local economy. Improvements in roads and recreation facilities. Landscaping and restoration after.
- DISAD. explosives cause DUST and NOISE. Permanently damages landscape, destroys HABITATS, TRANSPORTATION via lorries - more NOISE and POLLUTION, waste materials = UNSIGHTLY.
- ADVANTAGE: provides HOUSES and ROADS. DYES, PAINTS and MEDICINES from limestone. NEUTRALISEmore jobs, local economy. Improvements in roads and recreation facilities. Landscaping and restoration after.
- Cheaper than granite or marble. Easy to cut. More hard-wearing, but still attractive.
- Doesn't rot like wood, can't be gnawed by insects. FIRE RESISTANT.
- HEATED with CLAY makes CEMENT
- LIMESTONE.
- THERMAL DECOMPOSITION
- Calcium Oxide CAO
- ADD WATER
- Calcium Hydroxide CA(OH)2
- ALKALINE. Used to neutralise acids e.g. sulphur dioxide causes acid rain which makes lakes and soils acidic. This kills plants and animals & creates dead zones
- Powdered limestone can be used for this too but hydroxide works much quicker.
- ALKALINE. Used to neutralise acids e.g. sulphur dioxide causes acid rain which makes lakes and soils acidic. This kills plants and animals & creates dead zones
- ADD MORE WATER
- Calcium Hydroxide Solution CA(OH)2 (aq)
- Limewater. Reacts with CO2 to produce Calcium Carbonate - Used as a test for CD (Turns cloudy if present)
- ADD CO2
- Calcium Carbonate - CACO3
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