C3 OCR C3 0.0 / 5 ? ChemistryChemicals in our livesGCSEOCR Created by: xfireregCreated on: 02-05-16 18:33 What do tectonic plates float on? The tectonic plates are floating on top of the mantle (molten rock) 1 of 21 Why has Britain been located on different parts of the surface of the Earth? Most tectonic plates move at speeds of a few cm per year. This means Britain today was at a different location on the surface of the Earth 2 of 21 List three processes by which minerals are formed Sedimentation, dissolving, evaporation, erosion and mountain building 3 of 21 What is coal made from? Coal consist mainly of carbon. Coal formed over millions of years by the fossilisation of layers of plant matter 4 of 21 where is salt mined in the UK? In the UK, salt is extracted from underground deposits. - Evaporation 5 of 21 What is rock salt? A mixture of salt and impurities found in underground deposits 6 of 21 Three methods of obtaining salt industrially 1) Salt Mining 2) Solution Mining 3) Evaporating seawater 7 of 21 What is a food preservative? A food preservative is something added to foods to give them longer life before they go 'off' due to mould, bacteria etc. 8 of 21 What is the main health concern associated with too much salt? Eating too much salt can cause high blood pressure which could lead to strokes and heart attacks 9 of 21 Name the three products of brine electrolysis 1) Chlorine 2) Hydrogen Sodium Hydroxide 10 of 21 Two uses of chlorine 1) killing bacteria 2) disinfectants 11 of 21 How is bleach made? Reacting chlorine with sodium hydroxide 12 of 21 Two toxic chemicals used in large-scale brine electrolysis 1) Mercury 2) Asbestos 13 of 21 Why is chlorine added to water supplies? It kills disease-causing microorganisms 14 of 21 What is an alkali? An alkali is a compound that dissolves to give a solution with a pH higher than 7 15 of 21 Name three chemicals that are alkalis (Alkalis include soluble hydroxides and carbonates) Sodium hydroxide, Potassium hydroxide, Calcium carbonate 16 of 21 Products of reaction between calcium carbonate and sulfuric acid? Calcium Sulfate + Water + Carbon Dioxide 17 of 21 Why are alkalis added to some soils? To neutralise acidic soils 18 of 21 What happens when chemicals like DDT get into rivers? kills of animals such as otters 19 of 21 What does LCA stand for? Life Cycle Assesment 20 of 21 4 stages needed to be considered when doing an LCA Choices of material, Manufacturing, Using the product, Product Disposal 21 of 21
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