2003 Chemistry Higher Finalised Marking Instructions - eduBuzz

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Mark Scheme Worth ½ Worth 0 14. (a) Seawater (sodium chloride), carbon dioxide, ammonia (- ½ for any omission) or correct formulae 1 use of exothermic/ endothermic (b) CaCO3 CaO + CO2 ∆H = +ve (½) C + O2 CO2 ∆H = -ve (½) 1 (c) Ca(OH)2 + 2NH4Cl CaCl2 + 2H2O + 2NH3 1 Page 20
Mark Scheme Worth ½ Worth 0 14. (d) magnesium carbonate is insoluble or magnesium carbonate forms a precipitate 1 recycling occurs or no waste products or non-polluting or by-products are useful (e) CO2 or NH3 or NH4Cl recycled (reused) or coke added to limestone to provide energy by reacting with O2 from air (or by burning) or calcium chloride produced as by-product or (some) reactants found naturally (easily obtained, cheap) or continuous process (any two, 1 mark each) 2 (6) Page 21
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2003 Chemistry Higher Finalised Marking Instructions - eduBuzz

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