5.1 Provide a detalled mechanism for the polymerization of styrene on treatment with BF3 in the presence of trace amounts of water. (6) 5.2 Calculate the number average molecular weight for a polymer sample which consist of 12 moles of polymer molecules having molecular weight of 48,000g/mol and 16 moles of polymer molecules having molecular weight of 36,000g/mol (3) 5.3 Describe the functionality of a lead storage cell. Use chemical equations and diagrams to illustrate your answer, where appropriate. (10) 5.4 List six conditions when disinfecting water using hose hoid bieach such as 6 ar 8.25% of sodium hypochlorite (a)