Core Chemistry Big Teach 2: Materials From the Earth

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

Rocks SedimentaryMetamorphicIgneous 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 formed When Lava cools Things to Know Marble turns into granite If the laveacools quickly it contains small crystals If it cools slowly It contains large crystals

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

Remember – They are all the same thing Limestone Calcium Carbonate CaCO 3

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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Advantages of a limestone quaryDisadvantages 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