1) what is the relative formula mass of MgCl₂ Mg=12 Cl=35.5 a) 95 b) 96 c) 94 d) 93 2) If a prcatical produces 2.5 g of a product what is the percentage for a practical if the predicted yield should have been 15g a) 0.166 b) 16.6 c) 12.5 d) 11.2 3) What 2 reagents are needed to produce ammonium sulphate? a) ammonia + phosphoric acid b) ammonia + sulphuric acid c) sodium hydroxide +sulphiric acid d) sodium hydroxide + phosporic acid 4) What is the % mass of nitrogen in NH₄NO₃ N=14 O=16 H=1 a) 20.4% b) 22.3% c) 21.2% 5) In the Haber process temperature decreases the yield of ammonia produced because: a) the forward reaction is exothermic b) the forward reaction is endothermic 6) Which of these is only a cost implication in producing medicine? a) Cost of raw material b) price of energy c) plant cost (equipment) d) Skilled labour costs 7) Why wash clothes at a low temperature a) kills of enzymes b) uses less energy c) helps the fats to dissolve 8) Most deteregents are: a) Salts b) Acids c) bases 9) Dry cleaning works by a) breaking intermolecular bonds bewteen the solvent b) producing intermolcular bonds in the stain c) producing intermoleculare bonds between the solvent and stain. 10) Diamond has a high melting point because> a) the ionic bonds are very strong and take a lot of enrgy to break b) the covalent bonds are very strong and take a lot of enrgy to break c) it does not have free electrons

C4 quiz

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