C14 0.0 / 5 ? FunChemistryFunNone Created by: sotes003.302Created on: 20-03-19 21:29 Finite resources - Resources that will eventually be used up as they are exploited / Fossil Fuels 1 of 22 Renewable resources - Resources which can be replaced at the rate at which they are used up / Biofuels 2 of 22 Fossil Fuels - Estimations as to when they will run out Fossil fuels are finite / All estimations are only guesses based on limited information 3 of 22 Potable water - Water that is safe to drink 4 of 22 Making Water potable - Process Screening - removes solid particles / Sediment removed as sludge + sand filtration / Sterilisation using UV , Chlorine or ozone / Final checks to check pH 5 of 22 Desalination - Turning salt water into potable water 6 of 22 Reverse Osmosis - Using membranes to filter the salts in the water / A fairly expensive process 7 of 22 Distillation - Heating the water until it boils and condenses leaving potable water and salt separate / Requires a lot of energy to heat the water 8 of 22 What is Malachite - Copper ore 9 of 22 Extracting Copper (Displacement) Copper sulfate and scrap iron are used for a displacement reaction to produce iron sulfate and pure copper 10 of 22 Extracting Copper (Smelting) Copper ores are melted at high temperatures to produce impure copper / Impure copper is purified using osmosis 11 of 22 Extracting Copper from Low Grade Ores - Bioleaching Using Bacteria to feed on low grade ores to produce copper solutions which are used for electrolysis 12 of 22 Extracting Copper from Low Grade Ores - Phytomining Plants are used to absorb copper ions in the soil / Plants are burnt and copper rich ashes are used to collect pure copper 13 of 22 What is an LCA - A LCA (Life Cycle Assessment) is an assessment on all of the environmental impacts of all stages in the life of a product 14 of 22 4 Stages / Criteria - Harvesting and processing Raw materials / Manufacturing / Using, Reusing and maintenance / Disposal or end of life 15 of 22 Stages - All materials and energy sources found / Environmental impacts are evaluated / Results are found and better methods are implemented 16 of 22 Why are LCA's always different - They often use estimates as accurate data can be hard to achieve meaning that final results always differ 17 of 22 Aims of Reduce, Reuse and Recycle - To prevent the excessive exploitation of finite resources / Reduce wasted energy / Reduce the waste produced 18 of 22 Recycling Aluminium - Aluminium is finite and widely used / It is good to recycle aluminium as it is 95% energy saving 19 of 22 Recycling Steel - Steel requires a lot of combustion pf fossil fuels to be produced / 50% energy saving 20 of 22 Recycling Copper - Copper is less recyclable as it is often in alloys or impure / This means it is harder to extract pure copper needed for wires etc 21 of 22 Environmental Considerations - Pollution / Uses more finite resources / Empty quarries destroy animal habitats / Noise + air pollution / Sulfides in ores contribute to acid rain 22 of 22
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