Set 11 Chemistry [Paper] 1

ONLY HARD WORK CAN TURN DREAMS IN TO REALITY 1 SECTION A -46 MARKS Attempt all questions in this section. 1. (a).Define the following terms . (@01 mark) i. Bond energy. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ii. Heat of formation. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… b) Given the following bond energies. Bond Bond energy [KJ/mol] C-C 337 C-H 414 C-O 360 O-H 123 Calculate the heat of conversion of gaseous methoxymethane to gaseous ethanol. (02 marks) …………………………………………………………………………………………………………………… ……………………………………………………………………………………………… …………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………… …………………………………….. ONLY HARD WORK CAN TURN DREAMS IN TO REALITY 2 2. Complete each of the following organic reactions and give the IUPAC names for the major product (s) . a). Name of product: ........................................................... (0½ mark)............................... (01 mark) b).CH=CH2 Catalyst/Heat............................. (01 mark) Name of product (s): ...................................................... (0½ mark) c).Heat............................ (01 mark) Name of product (s): ...................................................... (0½ mark)O PCl5 (CH3COO)2Ca d). HOCH2CH2CH2CH2OHExcess H+/Cr2O72- Heat.......................................... Name of product (s): ...................................................... (0½ mark) 3.(a) An alkyne, Q has molecular formula C 4H6.Write the names and structural formulae of all possible isomers of alkyne, Q. (02 mark s) ……………………………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………….. b) . Alkyne, Q react with ammoniacal silver nitrate solution. i. State what is observed. (0½ mark) ONLY HARD WORK CAN TURN DREAMS IN TO REALITY 3 ………………………………………………………………………………………………………………… ……………………………………………………………………………………………………… ………… ii. Write the equation for the reaction in b (i) above. (01½ marks) ………………………………………………………………………………………………………………… ……………………………………………………………………………………………………… ………… c) Write equations to show how alkyne, Q can be synthesized from ethane. (04 marks) ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… 4. Name a reagent that can be used to distinguish between t he following pairs of compounds and in each case, state what would be observed if each members of the pair was treated with the named reagent. (@02 marks) a) CH3CH2OH and CH 3OH Reagent …………………………………………………………………………………………………………………………… ………………………………………………………………………………………………… ……………………….. Observations ONLY HARD WORK CAN TURN …