MURANGA SOUTH - 2025 OPENER EXAM TERM 3 CHEMISTRY PAPER 1 - THEORY

MURANGA SOUTH - 2025 OPENER EXAM TERM 3
Kenya Certificate of Secondary Education (K.C.S.E)
233/1
CHEMISTRY PAPER 1 - THEORY
1. Draw a labelled diagram showing;
(i) The atomic structure of 23
(2 marks)
11𝑁𝑎
1 +
(ii) The ionic structure of 1𝐻
(1 mark)
2. (a) State two advantages of using glass over plastic apparatus in the laboratory.
(2 marks)
(b) Name the apparatus used to keep substances free from moisture.
(1 mark)
3. (a) Which homologous series is represented by each of the following general formulae?
(i) CnH(2n-2)
(1mark)
(ii) CnH(2n+1) COOH
(1mark)
(b) Raw rubber is heated with Sulphur in the manufacture of natural rubber. Why is the process
necessary?
(1mark)
4. The graph below shows the mass of a radioisotope plotted against time.