Chemistry(Chem 051) Question Paper
Chemistry(Chem 051)
Course:Education And Pre-University
Institution: Kenya Methodist University question papers
Exam Year:2011
TIME : 2 HOURS
INSTRUCTIONS Answer ALL Questions
Question 1
a) Explain the following terms:
i) Chemical change (2marks)
ii) A compound (2marks)
iii) Physical change (2marks)
iv) A mixture (2marks)
b) Explain the structure of an atom (2marks)
c) Briefly explain five separation processes of mixtures (5marks)
Question 2
a) What is an isotope (2marks)
b) Differentiate between:
i) Mass number and atomic mass (4marks)
ii) Atom and an ion (4marks)
c) Explain the importance of the periodic table (5marks)
Question 3
a) State and give the equation of:
i) Boyle’s law
ii) Charles law
iii) Gay-Lussac’s law (6marks)
b) A sample of oxygen gas occupier a volume of 10 litres under the pressure of 790mm Hg. At what pressure would it occupy at a volume of 13.4 litres, if the temperature remains constant? (3marks)
c) i) Explain the meaning of ideal gas law (3marks)
ii) What is meant by absolute zero of gas (3marks)
Question 4
a) Define the term radioactivity (2marks)
b) Briefly discuss the following terms:
i) Alpha Decay (2marks)
ii) Beta Decay (2marks)
iii) Gamma Decay (2marks)
iv) Half – life of an element (2marks)
c) Differentiate between nuclear fission and nuclear fusion as used in radioactivity (5marks)
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