1 [5] Q15. (a) any one advantage from: conserves resources (of crude oil / metal ores) • ignore can be made into other items allow the materials (in the pen) are non-renewable allow less expensive than producing from the raw material reduces use of landfill • ignore less waste less use of fuels/energy • less carbon dioxide produced • ignore global warming unqualified 1 any one disadvantage from: made of different polymers / alloys / materials • difficulty / cost of separating the different materials • allow not all the materials can be recycled 1 (b) hard / strong / durable 1 resistant to corrosion or unreactive allow do not rust do not allow corrosive 1 (c) (i) vapours (of decane) ignore pressure / hot / heat
1 [5] Q15. (a) any one advantage from: • conserves resources (of crude oil / metal ores) ignore can be made into other items allow the materials (in the pen) are non-renewable allow less expensive than producing from the raw material • reduces use of landfill ignore less waste • less use of fuels/energy • less carbon dioxide produced ignore global warming unqualified 1 any one disadvantage from: • made of different polymers / alloys / materials • difficulty / cost of separating the different materials allow not all the materials can be recycled 1 (b) hard / strong / durable 1 resistant to corrosion or unreactive allow do not rust do not allow corrosive 1 (c) (i) vapours (of decane) ignore pressure / hot / heat
chemical_changes_part_2_mark_schemes.docx