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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: Chalk and Limestone Examples: Marble Examples: Granite How was it formed? How is it formed? How is it cooled • Sediments fall to bottom of the sea • Over millions of years • Layers compact • Rock formed • Sedimentary rocks are put under heat and pressure • When Lava cools Things to know: • They contain fossils • They erode easily Things to Know Things to know • Limestone turns into Marble • The heat comes from the magma • Marble turns into granite • If the lave cools quickly it contains small crystals • If it cools slowly It contains large crystals Questions Answers The Limestone Cycle Solution goes cloudy You can use this diagram to answer any exam questions: Calcium Carbonate e.g: word equations 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 Questions Answers 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
