Page 06 9. Which of the following is the salt of a long-chain fatty acid? A Fat B Oil C Soap D Glycerol 10. Emulsifiers for use in food are commonly made by reacting edible oils with A esters B glycerol C fatty acids D amino acids. 11. The equation for the reduction reaction taking place when ethanal reacts with Tollens’ reagent is A Cu2+(aq) + e− → Cu+(aq) B Ag+(aq) + e− → Ag(s) C Cr2O7 2−(aq) + 14H+(aq) + 6e− → 2Cr3+(aq) + 7H2O(ℓ) D MnO4 −(aq) + 8H+(aq) + 5e− → Mn2+(aq) + 4H2O(ℓ) 12. The name of the compound with structure: H3C CH CH3 CH CH3 C CH3 O is A 2,3-dimethylpentan-4-one B 2,3-dimethylpentan-2-al C 3,4-dimethylpentan-2-one D 3,4-dimethylpentan-2-al. Page 07 13. CaCO3(s) + 2HNO3(aq) → Ca(NO3)2 (aq) + CO2(g) + H2O(ℓ) Mass of 1 mol Mass of 1 mol = 100 g = 164 g 2·00 g of calcium carbonate (CaCO3) was reacted with 200 cm3 of 0·1 mol l−1 nitric acid (HNO3). Take the volume of 1 mole of carbon dioxide to be 24 litres. In the reaction A CaCO3 is the limiting reactant B an excess of 0·1 mol of nitric acid remains at the end of the reaction C 1·64 g of calcium nitrate is produced by the reaction D 480 cm3 of carbon dioxide is produced by the reaction. 14. The mean bond enthalpy of a C – F bond is 484 kJ mol−1. In which of the processes is DH approximately equal to +1936 kJ mol−1? A CF4(g) → C(s) + 2F2(g) B CF4(g) → C(g) + 4F(g) C CF4(g) → C(g) + 2F2(g) D CF4(g) → C(s) + 4F(g) 15. In a reversible reaction, equilibrium is reached when A molecules of reactants cease to change into molecules of products B the concentrations of reactants and products are equal C the concentrations of reactants and products are constant D the activation energy of the forward reaction is equal to that of the reverse reaction. 16. Which of the following equations represents the enthalpy of combustion of propane? A C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(ℓ) B C3H8(g) + 7 2 O2(g) → 3CO(g) + 4H2O(ℓ) C C3H8(g) + 3O2(g) → 3CO2(g) + 4H2(g) D C3H8(g) + 3 2 O2(g) → 3CO(g) + 4H2(g) [Turn over