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C3 Chemicals in Our Lives – Risks & Benefits

C3 Chemicals in Our Lives – Risks & Benefits. Lesson 12: Life Cycle Assessment. Objectives. MUST explain what is meant by a Life Cycle Assessment and how it is done SHOULD use Life Cycle Assessments to compare the impacts of products made from different materials. Key Words.

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C3 Chemicals in Our Lives – Risks & Benefits

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  1. C3 Chemicals in Our Lives – Risks & Benefits Lesson 12: Life Cycle Assessment

  2. Objectives • MUSTexplain what is meant by a Life Cycle Assessment and how it is done • SHOULD use Life Cycle Assessments to compare the impacts of products made from different materials

  3. KeyWords • You need to be able to define the following: • Life Cycle Assessment

  4. Textbook Answers 1) Crude oil/ petroleum (from rocks). 2) E.g. drinks bottles/cans, snack/sweet packets, magazines, clothes, pens, containers for shower gel/cosmetics, etc. 3) a) Plants; b) Animals; c) Rocks (crude oil); d) Plants; e) Rocks. 4) Heating the polymer to soften it; running the moulding machinery; cooling water to cool the product; transporting the polymer to the factory and the product away from the factory. 5) a) (ii) higher than (i); b) (ii) higher than (i) 6) a) Mining aluminium ore and drilling for oil have similar environmental impacts; more energy required for aluminium so more pollution from burning fossil fuels. b) More energy needed to transport glass bottles; more pollution from burning fossil fuels.

  5. Worksheet Answers Activity 1 (Low demand) 1) Cork 2) PVC 3) Cork; it can be burned and is biodegradable. 4) PVC lasts longer than untreated cork; it is hardwearing and does not decay. 5)PVC advantages – resources available from many places; hardwearing. Disadvantages – toxic substances produced in manufacture and disposal; non-renewable resource. Cork advantages – renewable resource; low environmental impact. Disadvantages – relatively short life if not treated; restricted production.

  6. Worksheet Answers Activity 2 (Standard demand) Students may produce a summary LCA as a diagram or table. Benefits see question 5 above. Overall environmental impact – PVC is the worst. Final decision depends on student’s arguments – PVC has the longer life and is more widely available, so despite its environmental impact it may prove to be the best. Higher-tier students could be encouraged to give scores (1 to 5) to each material for each section of the LCA. Activity 3 (High demand) Alternatives– linoleum, carpet (hemp, wool, polypropene), wood; students may provide an LCA for one or more of these and make a decision on their favoured material; wood or linoleum may be the best.

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