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NABTEB GCE 2021 CHEMISTRY THEORY AND OBJ ANSWERS

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==> *Thursday 11th February*
Chemistry (9:00am-11:30am)
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CHEMISTRY OBJ
01-10: CBABCBDADC
11-20: CBBBBCBDDC
21-30: AADBACCDDB
31-40: AAACACBBDA
41-50: BCCABCBDBC
 
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1a)
(i)Atom can neither be created nor destroyed,furthermore, Atoms cannot be divided into smaller particles
(ii)All matter is made up of tiny ,indivisible particles called atoms
(iii)Atoms of different elements may contains with each other in a fixed ,simple ratio to form compound atoms.
(iv)Atoms of the same elements are similar in shape and mass but differ from atoms of the other elements.
v)Atom is the smallest unit of mattee that can take part in chemical Reaction and still Retains it’s chemical properties after reaction.
 
 
1b)
i)Filtration
ii)Liquid
iii)distillation
 
1c)
i)
-Helium
-Neon
 
ii)
-Mercury
 
iii)
-Hydrogen H2
-oxygen O2
 
1c)
Empirical formular of a compound is the simplest whole number ratio of atoms of each element in the compound.its determined using Data from experiments.
 
1e)
i) loading…
ii) loading…
 
iii)
-make sulphur dioxide
-converts the sulphur dioxide into sulphur trioxode(the irresible reaction of the heart of the process)
-Convert Sulphur trioxide into Cone sulphuric acid
 
 
1ei)
Empirical Formular
Carbon Contain 0.48g
Hydrogen Contain 0.1g
Atomic Number of carbon =12
Atomic number of hydrogen =1
 
Therefore, C= 0.48/12= 0.04
H= 0.1/1 =0.1
 
Therefore,C=I and H=3
Empirical Formular =CH3
 
 
1eii)
Molecular Formular=(CH3)n=15
(CH3)n=15
[12+(3×1)]n=15
[12+3]n=15
15n=15
n=15/15
n=1
 
Therefore,Moleculer Formular =(CH3)
=CH3
 
 
 
 
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3ai)
Hydrocarbon is any organic chemical compound composed exclusively of hydrocarbon and carbon atoms.
 
3aii)
(i)The members have the same functional group
(ii)members have the same general formulars
(iii)members have almost the same chemical properties due to the same functional group.
 
3bi)
Name:Ethyediol or acetylenediol
Structure HO–C =C—OH
 
3bii)
Hydroxyl Group
 
3biii)
C2H2O2+H20+NaoH===>Na2C2H302+OH
 
 
3biv)
H
|
H===C ==C===Na
|
H
Sodium Ethanoate
 
 
3ci)
Hydrogenation Reaction
 
3cii)
Hydrogenation
3ciii)
Esterification
3di)
C6H12O6=====>2c2H5OH+2Co2
3dii)
Saporification
3diii)
-Diesel Fuel
-Gasoline
 
Diesel Oil
i)use as fuel for heavy vehicles
ii)use to power some electrical and construction machines
 
 
Gasoline
i)use as fuel for aeroplane
ii)use as fuel for transportation vehicles
 
Asphat
i)Use in constructing of roads
ii)use in constructions of dams and reserviances.

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