Set 25 Chemistry [Paper] 1

‘When schools flourish, all flourishes’ Tr.Felix Js Rubangakene Geofrey Jr 1 SECTION A -46 MARKS Attempt all questions in this section. 1. Write equations to show how the following compounds can be synthesized . a) Propanoic acid from bromoet hane. (02 marks) ……………………………………………………………………………………………………………………… …………………………………………… ……………………………………… ………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………….. b) Methylethanoate from bromoethane . (01 mark) ……………………………………………………………………………… ……………………………………… ………………………………………………………………………………………………………… ………….. ……………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………….. ……………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………. 2. State what is observed and write equation for the reaction which takes place when dilute sodium hydroxide solution is added drop wise until in excess to; a) Ni2+. (02 ½ marks) ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………….. ‘When schools flourish, all flourishes’ Tr.Felix Js Rubangakene Geofrey Jr 2 b) Mn2+. (02½ marks) ………………………………………………………………………………………………………………… …………………………………………………… …………………………………………………………… ………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………….. 3.(a) What is meant by the term Osmotic pressure? (01 mark) ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………. b) State any two significance of osmosis . (01 mark ) ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… c) The osmotic pressure of a solution containing 2.48% of a polymer is 6.2 x 10-3 atmosphere at a temperature of 25ᵒC.Determine the relative molecular mass of the polymer . [Universal gas constant, R = 0.08821dm3atm/mol/k] (03 marks) ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ………………………………………………………………………… …………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ‘When schools flourish, all flourishes’ Tr.Felix Js Rubangakene Geofrey Jr 3 4.(a) State any four properties in which beryllium shows similarities with aluminium . (02 marks) …………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………. (b)(i).Explain why beryllium behaves differently fro m other members of group (II) elements. (02 marks) …………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………… . (ii).Name two other elements which have similar relationships like beryllium and aluminium. (01 mark) …………………………………………………………………………………………………………………………… ………………………………………………………………………… ………………………………………………… …………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………. 5.(a) What is meant by the term boiling point constant of a liquid? (01 mark) ………………… ………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………. ‘When schools flourish, all flourishes’ Tr.Felix Js Rubangakene Geofrey Jr 4 b) Explain why the method of …