© www.chemsheets.co.uk GCSE 026 08-April-13. Limestone quarry.

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Presentation transcript:

© GCSE April-13

Limestone quarry

Topley Pike quarry in the Peak District National Park

All built with limestone

Chippings in roads Chippings Paving To neutralise acidic lakes

CaCO 3  CaO + CO 2 calcium carbonate calcium oxide (limestone) (quicklime) CaO + H 2 O  Ca(OH) 2 calcium oxide calcium hydroxide (quicklime) (slaked lime)

Lime kilns (old and new)

Farmer spreading calcium hydroxide to neutralise acidic soil

Testing for CO 2 with limewater (calcium hydroxide solution) Testing for CO 2 with limewater Limewater = calcium hydroxide solution

CEMENT Powdered limestone + Powdered clay Heat in rotary kiln

CONCRETE Cement + Sand + Water + Crushed rock

Concrete can break if stretched or bent

Steel reinforced concrete

Bahai Lotus Temple in Delhi, India – made of concrete (1980)

MORTAR Cement + Sand + Water

Mortar weathers and brickwork must be re-pointed.