C1 0.0 / 5 ? ScienceEnvironmental changeGCSEEdexcel Created by: srashid99Created on: 11-10-15 10:56 The percentage of Oxygen in the atmosphere has increased since the Earth's earliest atmosphere. Describe the process that has caused this change. Photosynthesis occurs - Green plants absorb carbon dioxide and release oxygen 1 of 5 Describe a test to show a gas is oxygen Light a splint till glowing. It will relight, bursting into flame again. 2 of 5 Give a large scale use of limestone. Making glass/concrete/cement. Extracting iron. Neutralising acidic gases. 3 of 5 Explain how marble is formed from Limestone. Through the action of heat and pressurw. 4 of 5 What is the balanced equation for the reaction of Calcium Oxide with water to form Calcium Hydroxide. Cao + H^2O ----- Ca(OH)^2 5 of 5
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