Chem Istry Department Uganda Adavanced Certificate Of Education End Of Term Three Senior Five Chemistry 2025

©jsemz2024. NAME: ……………………………………………………………………………………... STREAM: ………………………………… DATE: ……………………… ………………………………………………………………….. COMB: …………………… ……………. P525/1 CHEMISTRY Paper 1 (Theory) Oct. / Nov. 2024 2 ¾ hours CHEMISTRY DEPARTMENT UGANDA ADVANCED CERTIFICATE OF EDUCATION END OF TERM III EXAMINATIONS S.5 CHEMISTRY Paper 1 (Theory) 2 hours 45 minutes Instructions:  All questions must be answered in the spaces provided.  Answer all questions in section A and six questions in section B.  Silent non -programmable scientific electronic calculators may be used.  Illustrate your answers with equations where applicable.  Where necessary use the following: Universal gas constant , R = 8.314 J/Kmol [H = 1; C = 12; O=16] For Examiner’s Use Only 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 TOTAL 2 ©jsemz2024 CH3COCl NO 2 Section A (46 marks) Attempt all questions in this section 1. Complete the following reactions and give the name of the organic reaction. (@ 02 marks) a) Name of organic reaction: …………………………………………………………………………………………………… b) Name of organic reaction: ………………………………………………………………………………………………………… c) Name of organic reaction: …………………………………………………………………………………………………… 2. a) i. State the conditions under which phosphorous reacts with sodium hydroxide solution (01 mar k) …………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………… ii. Write equation for the reaction that occurs. (01 ½ marks) …………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………….. b) Phosphorous forms a hydride with a formula PH 3. i. Comment on the solubility of the hydride of phosphorous in water. (0 ½ mark) ………………………………………………………… ………………………………………………………………………………… …………………………………………………………………………………………………………………………………………… ii. Give a reason for your answer in b (i) above. (02 marks) …………………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………………………………CH3C=CH 2 + HBr CH3 HC≡CH 3 ©jsemz2024 …………………… ……………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………… 3. a) Distinguish between crit ical point and triple point. (02 mark) …………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………… …………………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………………….. b) A liquid substance Y has its melting point and freezing point decreasing with increase in pressure. Draw a well …