WAEC Chemistry 2021 question and answer: This page contains both the WAEC Chemistry Objective and Essay Questions and Answers for the 2021 West African Senior School Certificate Examination (WASSCE).
The WAEC Chemistry will be written on Wednesday 27h September 2021, Chemistry – Essay & OBJ.
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Chemistry Area of Concentration
(a) Define the following terms:
(i) Saturated solution;
(ii) Solubility. 100
(b)In an experiment to determine the solubility of a given salt Y, the following data were provided:
Mass of dry empty dish = 7.16g = 17.85g
Mass of dish + salt Y = 9.30g
Temperature of solution = 20oC
Molar mass of salt Y = 100
Density of solution Y = 1.00gcm-3
Calculate the solubility of salt Y in
(i) g dm-30f solution,
(ii) mol dm-3 of solution. [6 marks]
(c) State the type of bond broken on melting each of the following substances:
WAEC Chemistry Questions and Answers 2021 Objective Answers and Essay
A molecular formula consists of the chemical symbols for the constituent followed by numeric subscripts showing the number of atoms of each element present while structural formula consists of symbols for the atoms connected by short lines that represent chemical bonds.
(i) Screening effect
(ii) Size of atom
(iii) Nuclear change
(i) The reaction must proceed both forward and backward i.e reversible
(ii) DG = O
(ii) It has the least ionization energy among the three
Graham’s law of diffusion states that the rate of diffusion of a gas is inversely proportional to the square root of their densities provided other conditions remained constant
(i) Na2SO4. Mg(NO3)2
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Thanks for reading, good luck.