UNIVERSITY OF NIGERIA NSUKKA ALVAN IKOKU FEDERAL COLLEGE OF EDUCATION OWERRI, IMO STATE SECOND SEMESTER EXAMINATION 2019/2020 SESSION CHEM 112-BASIC PRINCIPLES OF CHEMISTRY TIME:120 MINUTES ANSWER 4 QUESTIONS ONLY.

1a) State 3 kinetic theories of gases
(aii) state the following gas laws and write their mathematical expression
(i) Charles law ii) pressure law iii) Gay-lussacs law
(bi) Briefly explain absolute temperature
bii) state ldeal gas equation and define its parameters
biii) A given mass of gas with a volume of 6O0cm3 was collected at 40°C and 78OmmHg. What is its volume at S.T.P

2(a)State the definition of acids according to (i) Brownsted-lowry ii) Lewis
b(i) Define the following terms (i)pH (ii) Basicity of an acid
b(ii) What is an indicator? List 2 properties of a good indicator.
c. Mention 2 limitations of Arrhenius definition of an acid and base
cii) Calculate the pH of 4 x 10‐⁵

3. Define the following terms (i) oxidation ii) lattice energy iii) colligative properties iv) enthalpy
(b) Define Raoults law and state its mathematical expresslon
(c) list the 4 colligative properties and explain any 2

4. (a) briefly explain the following (i) solubility equilibria ii) solubility product iii) degree of dissociation
(b) write the expression for the equilibrium constant
(i) 2NO2 (g) + O2(g)→2NO2(g)
(i) 4HCI(g)+O2(g)→2H20(g) +Cl2(g)
(c) state 5 factors that affect degree of dissociation of an electrolyte

5.(a) write a short note on the following terms (i) electrolytic cell ii) voltaic cell iii) common ion effect iv) one component system
b)state Oswald dilution law
(c) state the law of mass action and show its mathematical expression
ii) list 2 factors affecting chemical equilibrium

6(a) write a short note on the following terms(i) heat of formation ii) heat of neutralization (iii) heat of solution iv) heat of combustion
b) How much heat is needed to raise the temperature of 600g of water from 20°C-100°C . specific heat capacity of
water is 4.1J/g°C
(C) at 28°C a sample of hydrogen gas occupies 130cm³. What will be its volume at 100°C, if the pressure remains
constant.