WAEC Chemistry 2021 Questions and Answers

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How to Subscribe For WAEC Chemistry 2021 ANSWERS

Chemistry 2 (Essay) 2:00pm. – 4:00pm.
Chemistry 1 (Objective) 4:00pm. – 5:00pm


Chemistry OBJ:
1-10: CDBAAAACAD
11-20: CBBCDCCADB
21-30: CACCABACBC
31-40: DBCBDCBABD
41-50: CBBCCABDDA


INSTRUCTION: YOU ARE TO ANSWER FOUR(4) QUESTIONS IN ALL.

QUESTION ONE(1) IN SECTION A & ANY THREE(3) QUESTIONS IN SECTION B.

NOTE: USE EITHER THE TYPED VERSION OR THE IMAGE VERSION… make your work look different.

(4bvi corrected)
Take note


(2)


(4)


(5)



SECOND VERSION – TYPED


(1a)
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.

(1b)
(i) The distance of the outermost electron
(ii) The size of the positive nuclear charge
(iii) The screening effect of the inner electron

(1c)
(i) The reaction must proceed both forward and backward i.e reversible
(ii) All the reactants and products are present at equilibrium

(1d)
(i) B is the strongest reducing agent
(ii) It has the least ionization energy among the three

(1e)
(Pick one)
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

OR

Graham’s law of diffusion states that at a constant temperature and pressure ,the rate of diffusion of a gas is inversely proportional to the square root of it’s density.

(1f)
(i) Na2SO4, Mg(NO3)2
(ii) CaCO3

(1g)
(i) Protein – condensational polymer
(ii) Perspex – additional polymer
(iii) Nylon – Condensation polymer

(1h)
Atomic radius can be defined as the half distance between the nucleus of two covalently bonded atoms.

(1i)
Ethanol has a higher boiling point than propane because it has stronger force of attraction than propane which has a weak van der waal’s force.

(1j)
(i) It aids the digestion of food
(ii) It aids the action of enzymes
(iii) It controls the availability of nutrients


(3ai)
H2SO4 (aq) + 2KOH(aq) —> K2SO4(aq) + 2H2O(l)

(3aii)
Given, Va = 25.0cm³, Vb = 24.0cm³, Cb = 0.15mol/dm³, Ca =?, Na = 1 , Nb = 2
Using,
CaVa/CbVb = Na/Nb
Ca = CbVbNa/VaNb
Ca = 0.15 × 24.0 × 1/25.0×2
Ca = 3.6/50 = 0.072mol/dm³

(3bi)
(i) 2Mg(s) + CO2(g) —> 2MgO(aq) + C(g)
(ii) This is because magnesium can reduce carbon (iv) oxide to black carbon and producing magnesium oxide

(3bii)
Mg(NO3)2
M of Mg(NO3)2 = 24+(2×14) + (6×16)
= 24 + 28 + 96
= 148g/mol
% of N = 28/148 × 100/1
N = 18.9%

(3ci)
(i) Reaction with KMnO4
(ii) Reaction with bromine water

(3cii)
It turns them colourless

(3d)
Boil the vegetable oil in sodium hydroxide solution, it breaks down releasing the organic acid and the alkanol. The process is known as saponification. The organic ester is immediately neutralized by the sodium hydroxide solution to form the sodium salt of the organic acid which is soap.


(4ai)
(i) Graphite – Hexagonal
(ii) Diamond – Octahedral

(4aii)
Diamond us hard because of the strong force of attraction that hold them together and it can not conduct electricity because all the available electrons are used for bonding while Graphite is soft because it’s particles are in layers and can conduct electricity because not all the electrons are used for bonding

(4bi)
(i) It helps to remove dissolved gases and oxidizes dissolved metals
(ii) It helps to remove objects such as rags, paper, plastics, and clogging of downstream equipment
(iii) It reduces particle concentration in water and minimizes the need for coagulation and flocculation

(4bii)
(i) Calcium tetraoxosulphate (vi)
(ii) Calcium hydrogen trioxocarbonate

(4biii)
(i) Filtration
(ii) Boiling

(4biv)
It has a sweet taste and it builds the shells of lower organisms

(4ci)
The ore (SnO2) is wasted out of the ground with water, powdered, washed and roasted to drive off oxides sulphur, arseric and antimony. The roasted one is now reduced by heating with coke in a reverberatory furnace and molten tin is tapped off from the bottom of the furnace. The tin obtained is impure and it is remelted on a slopping furnace in which the tin melts and run its moulds. The tin obtained is 99.9% pure

(4cii)
SnO2(g) + 2C(s) —> Sn(l) + 2CO(g)

(4ciii)
(i) Sn(g) + O2 —> SnO2(g)
(ii) Sn(g) + 2Cl(g) —> SnCl4(g)

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