C1C2C3 08 Life cycle assessment. 11 5(a) The Life Cycle Assessment of a product can be divided into four stages. These stages are shown below, but are.

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Presentation transcript:

C1C2C3 08 Life cycle assessment

11 5(a) The Life Cycle Assessment of a product can be divided into four stages. These stages are shown below, but are in the wrong order. A using the product B making the product from the material C disposing of the product D making the material from raw materials Write the letters A, B, C and D for the four processes in the correct order in the boxes. [2] (b) Scientists compare the environmental impact of three types of disposable grocery bag. They do this by carrying out a Life Cycle Assessment (LCA) for each type of bag. They compare bags made of paper, biodegradable plastic and polythene. The results for each whole LCA are shown in the table. Totals for 1000 bags for the whole LCA biodegradable paper plastic polythene Energy use (MJ) Fossil fuel use (kg) Municipal solid waste (kg) Greenhouse gas emissions (kg CO 2 ) Fresh water use (litres) (i) Which type of bag uses the most energy? [1] (ii) Which type of bag gives the least greenhouse gas emissions? [1] Turn over C123 Jan 2013

12 (iii) A government decides to ban the use of disposable bags made from polythene. Explain why this data might persuade the government to change this decision [2] (iv) There are other reasons for banning disposable bags made from polythene. Which two statements, when taken together, give another reason? Put ticks ( ✓ ) in the boxes next to the two correct statements. Polythene is a polymer. Polythene bags may cause litter. Polythene is made by joining ethene molecules. Polythene bags are expensive. Polythene is transparent. Polythene takes a long time to decompose. [2] (v) Plasticizers are added to polymers to make them more flexible. Explain why the use of some plasticizers can have a bad environmental impact [2] [Total: 10] C123 Jan 2013

16 © OCR 2013