FORM FOUR (CSEE) QUESTIONS AND ANSWERS CHEMISTRY - NECTA
NECTA - 032 CHEMISTRY - EXAMINERS’ REPORT ON THE PERFORMANCE OF CANDIDATES CSEE, 2013
FORM FOUR (CSEE) QUESTIONS AND ANSWERS MATHEMATIC - NECTA
The Examiners’ Report on the Performance of Candidates in Chemistry subject in the Certificate of Secondary Education Examination (CSEE) 2013 was prepared in order to provide feedback to students, teachers, parents, policy makers and the public in general on the performance of candidates in a respective subject.
This report on CSEE 2013 Chemistry paper 1 is based on the analysis of candidates’ performance on the stated examination. The examination assessed candidates’ competences in accordance with 2007 Certificate of Secondary Education chemistry syllabus and the 2008 CSEE format.
A total of 144,651 candidates sat for this paper, out of these, 72,552 (50.19%) candidates passed the examination and 72,099 candidates (49.81%) failed. The statistics are in contrast to 2012 CSEE performance, where by a total of 170,959 candidates sat for CSEE chemistry paper, and out of these, 75,441 candidates
(44.1%) passed and 84,293 (55.9%) failed. Therefore, the performance in 2013 has increased by 6.09 % compared to that of 2012.
CHEMISTRY QUESTIONS AND ANSWERS
Question 33. (a) Study the following portion of the periodic table with some elements represented by letters and answer the questions that follow.
(i) State how electronegativity varies from A to C and from B to D
(ii) Write the electronic configurations of A, C2-, D and B.
Answer to questions 3
6. (a) (i) State three characteristics of a homologous series.
(ii) Draw the displayed/open structure formula of 2, 2-dichlorohexane.
(iii) Giving two reasons, explain why 2, 2-dichloro-3-methylbutane is a structural isomer of 2, 2- dichloropentane.
(b) Carbon monoxide and hydrogen are used in the manufacture of methanol and the equilibrium is established according to the following equation. CO(g) + 2H2(g) ⇋ CH3OH(g) ΔH=-80 kJ mol -1.
(i) Give two features of the reaction at equilibrium.
(ii) Explain why an increase in temperature causes a decrease in equilibrium yield of methanol.
Answer to questions 6
7. (a) Briefly explain how aluminum is obtained from its oxide.
(b) Write down the chemical equations of the reactions between the following:
(i) Ethanol and sodium metal.
(ii) Propanol warmed with excess acidified potassium permanganate.
(iii) Propanol and acetic acid warmed together in the presence of concentrated sulphuric acid.
Answer to questions 7
9. (a) A current of 0.5 A were made to flow through silver voltameter for 30 minutes. Calculate the mass of silver deposited and the equivalent weight of silver.
(b) Explain the following reactions giving one example in each:
(i) Addition reaction.
(ii) Elimination reaction.
Answer to questions 9
