1) What is the relative formula mass of MgCl₂ Mg=24 Cl=35.5 a) 95 b) 96 c) 94 d) 93 2) If a practical produces 2.5 g of a product what is the percentage yield 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) 30.5% c) 35.0% 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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