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Waec 2020 Chemistry Questions & Solutions

Posted by on September 1st, 2020


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How to Get 2020 WAEC  CHEMISTRY  SOLUTIONS Question Paper.

Follow the steps below to get your waec chemistry questions and answers 1 hours before your exam time.
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*CHEMISTRY OBJ*
01-10: CACCBDADAC
11-20: ACDCDABADA
21-30: BABACCBAAC
31-40: CBACBCDBAA
41-50: DBADCBBBCB

*COMPLETED*

(1ai)
Faraday’s first law of electrolysis states that the amount of element deposited at the electrodes is directly proportional to the quantity of electricity applied in the electrolysis.

(1aii)
Strong electrolytes ionize completely (100%), while weak electrolytes ionize only partially.

(1b)
Properties of Ethyne
(Pick one)
(i) Ethyne is a colorless gas with a sweet smell when pure.
(ii) It is slightly less dense than air
(iii) It is almost insoluble in water.
(iv) It burns with a sooty flame due to high proportion of unburnt carbon.

(1c)
Unsaturated hydrocarbons are hydrocarbons that have double or triple covalent bonds between adjacent carbon atoms.

(1cii)
CH3COOH + CH3OH–>CH3COOCH3 + H2O

(1ciii)
methly ethanoate

(1e)
Mzn = 3.75g
Mzn = 65.0g/mol
n= m/M=3.75/65.0
n=0.0577mole
nH² =0.0577mole because the mole ratio is the same
np =n*L
np=0.0577*6.02*10^23
np=3.47*10^22 moles

(1f)
Flooding

(1gi)
Reaction C

(1gii)
Zinc (from + 2 to + 4)

(1hi)
(i)Each spectral line is caused by one electron
(ii)Electron can exist only in circular orbit of definite quantum energy.

(1hii)
It could not account for the spectrum at note complicated atoms

(1i)
(i)Temperature of the reacting system
(ii)Pressure of the reacting system
(iii)Concentration of the reacting system

(1j)
Both liberate carbon(iv) oxide
One produce a chloride salt , the other produce an ethronate salt

+++++++++++++++++++++++++++++++++

(2ai)
Isomers

(2aii)
A = Trans 1,2 di-chloroethane
B = Cis 1,2 di-chloroethane

2aiii) Yes.

2aiv)Because they are isomers. Isomers have same chemical properties but different physical properties.

2b) Destroying gaseous emissions
– Boiling is the rapid vaporization of a liquid 2bii) – WHEN NACL IS ADDED =>The more salt (or any solute) added to water, the more you raise the boiling point. Reduction of atmospheric pressure => lowering the atmospheric pressure will lower the boiling point of the liquid.

2c) A saturated solution contains the maximum amount of solute that will dissolve at that temperature. Any further addition of solute will result in undissolved solid on the bottom of the container. An unsaturated solution contains less than the maximum amount of solute that can be dissolved at that temperature.

2cii) -Add solute to a liquid until no more will dissolve. -Solubility often increases with temperature, so you may be able to get more solute into a hot solvent than you would if – Increase in pressure the solvent was cool

2ciii)Temperature and Pressure.
– Temperature affects the solubility of both solids and gases,
-Pressure only affects the solubility of gases

========

(3ai)
Draw the diagram

(3aii)
I. Activation Energy = (210 – 100)KJ = 110K
II. Hp – HR = ΔH
54 – 100 = -46KJ

(3aiii)
Q2(g) + R2(g) –> 2QR(g)

(3aiv)
Exothermic reaction.

(3av)
The heat content of the reactant is higher than that of the product.

(3bi)
E7 – 1s² 2S² 2P³
F9 – 1s² 2S² 2P⁵
G12 – 1S² 2S² 2P⁶ 3S²
H13 – 1S² 2s² 2P⁶ 3S² 3P¹

(3bii)
I. G and H
II. H
III. F
IV. GF2

(3ci)
Isotopy is the existence of an element in more than one physical form with the same atomic number but different atomic masses.

(3d)
(i) Atoms
(ii) Molecules
(iii) ions

=====

(5a)
(i)Ammonia (NH³)
(ii)Hydrogen chloride gas(HCl)

(5aii)
To show that hydrogen chloride is extremely soluble in water.

(5aiii)
Fill a round-bottomed fask with dry hydrogen chloride through a tube A and air through another tube B. Add a few drops of water through B and close the tubes. Invert the flask into a trough of water containing blue litmus solution. The water turns red.

(5bi)
(i)Petrochemical industries
(ii)Pharmaceutical industries.

(5bii)
(i)Pollution of water bodies by chemical waste
(ii)Pollution of the air
(iii)Radioactive particles are released

(5ci)
(i)Coke
(ii)Coal gas
(iii)Coal tar

(5cii)
(i)Coal gas=> important gaseous fuel
(ii)Coke => used as a reducing agent

(5di)
(i)calcium tetraoxosulphate(iv)
(ii)calcium hydrotrioxocarbonate(iv)

(5dii)
(i)By boiling.
(ii)Addition of caustic soda.

(5diii)
(i)Hard water contains dissolved minerals and therefore tastes better.
(ii)The calcium salts in hard water help animals to build strong teeth and bones.

=========

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