C 14 PPQ Mistakes
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Negatives of holding waste material lakes of mud
• Water Pollution • Visual Pollution • Dam could break and waste could spill out
Carbon fibres in polymer resin RM
Carbon fibre - reinforcement Polymer resin - matrix
Salt water has 0.5 mol/dm3 of Na+ and Cl- after reverse osmosis what would you expect to happen to ion concentration
• Both ions • Decrease by the same amount • eg 0.3 mol/dm3
Ground water has 0.001mol/dm3 of Cl- and Na+ ions why does their concentration not change after filtration
• Ions pass through the filter • As they are smaller than the holes • And are in solution
Why does ground water need to be exposed to UV
• Contains microbes which can cause disease • so water is steralised
A company says their water is pure, what does that mean?
• In its natural state / • nothing added to it
why recycling scrap copper is more sustainable then processing copper ore
• less metal goes to lanfill • Less energy is used • Less damage to habitats
why should green houses be made from recylced aluminium
• conserves finite ore • less energy • reduces landfill