Core Chemistry Big Teach 1: Materials From the Earth

Key terms used in exam questions Quary – Where we dig limestone

Rocks Sedimentary Metamorphic Igneous Examples: Marble Examples: Chalk and Limestone How was it formed? Sediments fall to bottom of the sea Over millions of years Layers compact Rock formed Things to know: They contain fossils They erode easily Examples: Marble How is it formed? Sedimentary rocks are put under heat and pressure Things to know Limestone turns into Marble The heat comes from the magma Examples: Granite How is it cooled When Lava cools Things to Know Marble turns into granite If the lave cools quickly it contains small crystals If it cools slowly It contains large crystals

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The Limestone Cycle You can use this diagram to answer any exam questions: e.g: word equations Calcium Carbonate Solution goes cloudy Water Carbon dioxide Hissing, steam, solid crumbles into a powder Calcium Oxide Carbon Dioxide Water

Remember – They are all the same thing Limestone Calcium Carbonate CaCO3

Remember – They are all the same thing Limewater Calcium Hydroxide Ca(OH)2

Remember – The Test for carbon dioxide Bubble the gas through limewater Lime water goes cloudy

Calcium Carbonate – The neutraliser Why is it sprayed onto fields Neutralise acidic soil Why is it sprayed onto waste gases from chimneys Neutralise acidic waste gases Why is it taken as an indigestion remedy Neutralise excess acid in stomach

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After its use it can be turned into a lake Damages habitats   Advantages of a limestone quary Disadvantages of a limestone quary Social (people living in the local area)  Provides jobs     Noisy Dusty Evironmental  After its use it can be turned into a lake  Damages habitats Economic (money)  Limestone is a valuable resource  Loss of tourism