C3 0.0 / 5 ? ChemistryChemicals in Our LivesGCSEOCR Created by: hopeCreated on: 13-05-14 20:01 What do tectonic plates float on? The crust and the upper part of the mantle 1 of 18 Why has Britain been located on different parts of the surface of the Earth? Most of the plates move at speeds of a few cm per year relative to each other 2 of 18 List three processes by which minerals are formed Sedimentation, Evaporation and Erosion 3 of 18 What is coal made from? Carbon 4 of 18 Where is salt mined in the UK? Underground deposits 5 of 18 What is rock salt? A mixture of salt and impurities 6 of 18 Give three methods of obtaining salt industrially Salt for food, Making chemicals, Roads to stop ice forming (grit) 7 of 18 What is a food preservative? Something added to foods to give them a longer life, before they go out of date 8 of 18 Health concerns associated with too much salt? High blood pressure, Strokes and Heart attacks 9 of 18 Name three products of brine electrolysis Oven cleaner, Soap, Bleach 10 of 18 Give three uses of chlorine Disinfectants, Killing bacteria, Plastics (PVC) 11 of 18 How is bleach made? Reacting chlorine with sodium hydroxide 12 of 18 Name two toxic chemicals that can be used in large-scale brine electrolysis Asbestos (can cause lung cancer) and Mercury (contaminated fish) 13 of 18 Why is chlorine added to water supplies? Kills diseases causing microorganisms, Kills bacteria, Prevents growth of algae 14 of 18 What is an alkali? A compound that forms hydroxide ions when dissolved in water 15 of 18 Why are alkalis added to some soils? To grow, Neutralise the crops before being planted 16 of 18 What does LCA stand for? Life Cycle Assessment 17 of 18 Four stages that need to be considered when doing an LCA? Choice of material, Manufacture, Using the product and Product Disposal 18 of 18
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