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Pchem 011: Basic Physical And Inorganic Chemistry Question Paper
Pchem 011: Basic Physical And Inorganic Chemistry
Course:Pre-University Programme (Pre-University)
Institution: Kabarak University question papers
Exam Year:2011
KABARAK UNIVERSITY
UNIVERSITY EXAMINATIONS
2011 ACADEMIC YEAR
FOR THE CERTIFICATE OF PRE-UNIVERSITY CHEMISTRY
PCHEM 011: BASIC PHYSICAL AND INORGANIC CHEMISTRY
DAY: FRIDAY DATE: 30/03/2011
TIME: 9.00 – 11.00 A.M. STREAM: SEM I
INSTRUCTIONS:
Attempt ALL questions
Given- Avogadro’s Number- 6.022 X1023
QUESTION ONE (30 MARKS)
1. a) (i) Define matter and energy.
(ii) Explain the difference between mass and weight, stating SI units?
(iii) Name two intensive properties that you could use to distinguish between
water and petrol? (6marks)
b) Differentiate between the following, giving an example of each.
i. Homogeneous substance and heterogeneous mixtures
ii. Atoms and Molecules. (4marks)
c) Define the terms
i. Mole
ii. Molar mass
iii. Avogadro’s number (3marks)
d) Answer the following questions for the balanced equation
2H20(l) gives 2H2(g) + O2(g)
i) How many molecules and how many atoms are in 2H20(l)? (2marks)
ii) How many molecules and how many atoms are in 2H2(g) + O2(g) ? (2marks)
iii) What is the quantity of carbon atoms in moles is contained in 0.20gm diamond (pure carbon)?
Given atomic mass of carbon is 12.00 gm. (2marks)
iv) A sample of sulphur contains 1.50 X1024 sulphur atoms. How many moles of sulphur atoms are
in the sample? (2marks)
e) i) Define an acid, a base and a salt, giving one example of each (3marks)
Answer questions for the reactions that occur between sodium sulphate and
Barium Chloride.
ii) Write a word equation of the reactants
iii) Write a balanced formula equation
v) Write the net ionic equation
vi) What type of chemical reaction occurred between the reactants? (4marks)
f) Predict whether the following compounds are ionic or covalent, giving supporting physical
properties and position in the periodic table accordingly:
i) Potassium Iodide (KI)
ii) Hydrogen peroxide ( H2O2) (2marks)
QUESTION THREE (20MARKS)
a) Define the terms;
i. Electronegativity
ii. Electron affinity (2marks)
b) (i) What does the “periods” and ‘groups’ represent in the periodic table?
(ii) Given that an atom T has atomic number of 23, give its electronic
configuration, the group and the period of the element in the periodic table.
(iii) Arrange the following cations in order of their increasing ionic radii:
K+, Ca+ and Ga+3.
(iv) Compare and explain the relative sizes of H+, H, and H-. (8 marks)
b) Using the orbital notation, give the electronic configurations of the following elements: Na
(11), Ne(10), S(16)and Ca(20). (4marks)
c) Explain the nature of the following chemical bonds, illustrate by drawings
i. Metallic bond
ii. Covalent bond
iii. Ionic bond (6marks)
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