Chem 2 Caltec S.4

NAME:........................................................... INDEX NO:.............. SIGNATURE:................................................ 545/2 CHEMISTRY PAPER 2 JUNE, 2018 2 HOURS CALTEC ACADEMY MAKERERE Uganda Certificate of Education CHEMISTRY PAPER 2 2 HOURS Instructions to candidates; Section A consists of 10 structured questions. Attempt all questions in this section. Answers to these questions must be written in the spaces provided. Section B consists of 4 semi-structured questions. Attempt any two questions from this section. Answers to the section must be written in the answer booklets provided. In both sections, all working must be shown clearly. FOR EXAMINER’S USE ONLY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Total SECTION A 1. a) Define the term rusting. (1mark) ……………………………………………………………………………………………..…………………………………………………………………………………………………..……………………………………………………………………………………………..…………………………………………………………………………………………………..……………………………………………………………………………………………..… b) State one word, which means; i) a method of preventing rusting by covering iron with zinc. (1mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. ii) iron sheet coated with tin. (1mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. c) Iron sheet coated with zinc is more superior to the one coated with tin. Give a reason. (1mark) ……………………………………………………………………………………………..…………………………………………………………………………………………………..……………………………………………………………………………………………..… d) State one reason why it is important to prevent rusting. (1mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. 2. Diamond and graphite are crystalline allotropes of carbon. a) State; i) What is meant by the term “allotrope.” (1mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. ii) one difference between diamond and graphite. (1mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. iii) one use of diamond (1mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. iv) one use of graphite (1mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. b) i) Name one amorphous allotrope of carbon. (½ mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. ii) State one use of the amorphous allotrope of carbon you have named in b(i) (½ mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. 3. a) Name; i) the fundamental particle of an atom which is; * positively charged ( ½ mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. * negatively charged ( ½ mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. * not charged ( ½ mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. ii) The particle, which is involved when an atom reacts with another atom. ( ½ mark) ……………………………………………………………………………………………..………………………………………………………………………………………………….. iii) The …