NAIVIE ...............................................................................• CLASS.......................................•
INDEX NO ADM NO STUDENT'S SiGN .
233/1 PAPER1
e~iMi~T'i~¥ i'~~ilf)~V
MARCH -APRIL 20~O
TIME - 2 HOURS
MOKASA JOIN1~ "IiItt~LEXAMINATIONS
FORM FOUR E\/ALl.JATION TEST - 2020
233/1 PAPER 1
CHEMISTRY THEORY
MARCHI APRIL 2020
TIME: 2 HRS
Instructions to Candidates
Write your name and class in the spaces provided.
Answer all questions in the spaces ~·rl)vided.
Non- programmed scientific calculators and Mathematical tables may be used.
All workings MUST be clearly shown where necessary.
Candidates should check the question paper to ascertain that all pages are printed as
indicated and no questions are missing.
- This paper consist of 15 printed pages.
FOR EXAMINERS' USE ONLY
---------_._-_ ..._,---------- -
Question Max score Candidates score
-- I--.
1- 29 80
©202.0 MOKASA 1 TRIALSCHEMISTRYPAPER1
I ,
, 1. (a) The flame below is obtained when the air hole of the Bunsen burner is fully
closed. State and explain the colour of the region marked A. (1 mks)
-++----A
b) (i) Give a reason for the following safety rule in the laboratory -:
Use a separate dropper for each of the stock solutions in reagent bottles (1/2 mks)
(ii) Using diagrams differentiate between a volumetric flask and a retort flask.
(2mks)
2. Element W whose RAM is 79.99 has two isotopes W -79 and W-81.
Determine the percentage relative abundance of the least abundant isotope.
(3 mks)
3. Describe how to obtain elianto cooking oil from corn grains. (2mks)
..
©2020 MOKASA 1 TRIALS CHEMISTRY PAPER 1
INDEX NO ADM NO STUDENT'S SiGN .
233/1 PAPER1
e~iMi~T'i~¥ i'~~ilf)~V
MARCH -APRIL 20~O
TIME - 2 HOURS
MOKASA JOIN1~ "IiItt~LEXAMINATIONS
FORM FOUR E\/ALl.JATION TEST - 2020
233/1 PAPER 1
CHEMISTRY THEORY
MARCHI APRIL 2020
TIME: 2 HRS
Instructions to Candidates
Write your name and class in the spaces provided.
Answer all questions in the spaces ~·rl)vided.
Non- programmed scientific calculators and Mathematical tables may be used.
All workings MUST be clearly shown where necessary.
Candidates should check the question paper to ascertain that all pages are printed as
indicated and no questions are missing.
- This paper consist of 15 printed pages.
FOR EXAMINERS' USE ONLY
---------_._-_ ..._,---------- -
Question Max score Candidates score
-- I--.
1- 29 80
©202.0 MOKASA 1 TRIALSCHEMISTRYPAPER1
I ,
, 1. (a) The flame below is obtained when the air hole of the Bunsen burner is fully
closed. State and explain the colour of the region marked A. (1 mks)
-++----A
b) (i) Give a reason for the following safety rule in the laboratory -:
Use a separate dropper for each of the stock solutions in reagent bottles (1/2 mks)
(ii) Using diagrams differentiate between a volumetric flask and a retort flask.
(2mks)
2. Element W whose RAM is 79.99 has two isotopes W -79 and W-81.
Determine the percentage relative abundance of the least abundant isotope.
(3 mks)
3. Describe how to obtain elianto cooking oil from corn grains. (2mks)
..
©2020 MOKASA 1 TRIALS CHEMISTRY PAPER 1
