chemistry

Candidate name……………………………………………………………………..

MINISTRY OF EDUCATION
MASALA SECONDARY SCHOOL BOARD MOCK EXAMINATION 2014
SCIENCE 5124/3 PAPER 3 (CHEMISTRY) 1hour 15minutes
Additional materials: Monday 30th July 2014.
Answer paper
INSTRUCTIONS TO CANDIDATES
Write your name, centre number and candidate number at the top of this page all separate
Attempt all questions in SECTION A and only TWO questions in SECTION B
SECTION A (45 marks) Answer all question in this section in the spaces provided
Q1 Forensic scientists use paper chromatography to compare the inks from five different bank notes with the ink used to make legal bank notes.
The results are shown as a chromatogram in Fig. 4.1.

(a) Draw the apparatus that could be used to produce this chromatogram.

(b) Which of the bank notes F, G, H, I and J

(i) is not a forgery,
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(ii) are printed with identical inks,
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(iii) is printed with ink containing four solvent-soluble dyes?
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[3]
(c) Use your knowledge of bank notes to suggest why water would probably not be a suitable solvent to use for this chromatography.
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Q2 An atom has an atomic number of 17 and a relative atomic mass of 35.

(a) Determine the number of protons and neutrons in the nucleus of this atom

Protons