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WAEC GCE 2018 Chemistry Obj And Essay Answer – Jan/Feb Expo

WAEC GCE Chemistry Obj And Essay/Theory Solution Questions and Answer – JAN/FEB 2018 Expo Runz.


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VERIFIED CHEMISTRY OBJ:
1-10: ACCDDAADAA
11-20: DCDABBDCAA
21-30: CBCBCCCADB
31-40: CCBDCCBACD
41-50: CBDA.C....
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1a)
Compound is a chemical substance composed of many identical molecules (or molecular sentities) composed of atoms from more than one element held together by chemical bonds.

1b)
i. Initiation
Ii. Hydrogen abstraction

1c)
i. Iron
Ii. cobalt

1di)
Zn(s) + 2AgNO3--->Zn(NO3)2 + 2Ag(s)

(1dii)
I. Ag is reduced
II. Zn is oxidized

(1e)
16
O - 90% abundance
8

16
O - 10% abundance
8

= The relative atomic mass Ar = (16×90/100) + (18×10/100)
= 1440/100 + 180/100 = 1440+180/100
= 1620/100 = 16.20

(1f)
The ores of iron are:
-Hematitie(Fe2O3)
-Magnetide(Fe3O4)

(1gi)
Biotechnology is the optimism exploitation of biological processes for industrial and other purposes. It is the branch of science that exploits microorganisms fot the production of antibiotics, hormones, etc.

(1gii)
Antibiotics

(1h) An element is a substance which can not be further divided by an ordinary chemical reaction.

(1i)
- fossil fuel for burning
- Biomass burning
- wetlands

(1j)
It is because the dipole induced dipole bonds are stronger in iodine than in bromine and than in chlorine ie there are more electrons in iodine than in bromine and that in chlorine



(2a)
It means that the standard electrode potential difference set-up between Zinc and one-molar solution of its ion at 298K

(2b)
(i) Zn²(Aq) + / Zn(s) ---- cathode
Cu/ Cu²+(aq) ------- anode

(ii) Zn²+(aq)/Zn(s) // Cu / Cu²+

(iii)
At the cathode ---- reduction
At the anode ----- Oxidation.

(iv) EΦ = EΦ - E
= 0.34-(-0.76)
= 0.34+0.76
= +1.10V

(2ci)
- Chemical and allied products industries
- sunshine oil and chemical industries
- Eleme petrochemical industries

(2cii) source of raw materials
Nearness to market
Source of amenities

(2ciii)
-Pollution of air (surrounding)
-Land excavation and improper with disposal

(2di)
Ag2O(s) +H2O2= 2Ag(s)+ O2(g)+H2O(l)

(2dii)
H2O2 + Cl2 => 2HCl(g) + 2H2)(l)

(2e)
-It is an inert gas
-It is slightly denser than air
-It is slightly soluble in water



5a)
1.Water Gas
2.Producer Gas

ii)Water Gas
iii) Both the hydrogen and Carbon(ii) Oxide in water gas burn in air to release a lot of heat,this makes it a better fuel
Iv)
1.Producer Gas
02(g) + N2(g) + 2C(s)-->2CO(g) +N2 + heat
2.Water Gas
C(s) +H2O(g)-->CO(g) + H2(g)

5b(i)Thermoplastics can be soften repeatedly by heat and remoulded..
Thermosets cannot be soften or melted by heat and remoulded once they are formed

ii)i.Bakelite
ii.Polythene
iii)
1.Plastic items can be manufactured at very low costs by using moulds and good manufacturing process
2.Raw materials for the manufacturing of plastics are readily and cheaply available from the refining of crude Oil
3.Plastics can be tailor made to our exact requirements, because of wide applications.



3a)
From the passage of steam through a mass of hot coke at
a very high temperature (about 1000 oC).
The water gas is mixed with more steam and passed over iron
(III) oxide (as catalyst) at 450 o C. More hydrogen is produced
and carbon(II) oxide gets oxidized to carbondioxide. I.e.
The carbondioxide is removed by dissolving the above products in water under 30 atm pressure - CO2 dissolves.
The gas is then passed through copper(I) methanoate in
ammonia solution under pressure to absorb any trace of carbon(II) oxide which might be present as impurity if not
removed - the hydrogen produced is pure.
3aii)
C (s) + H 2 O(g) → CO (g) + H 2(g)
3aiii)
I. by the action of a dilute strong acid on metals, such as zinc:
Ii. by reaction amphoteric metals with a strong base, such as sodium hydroxide:
Iii. by electrolysis of water:

3b)
I. Decrease in temperature shifts reaction towards product
side.
Ii. increase in pressure shifts reaction towards reactant side.
Iii. Increase in concentration of CO product side.
3ci)
Condensation polymerisation is a process whereby many
small monomer molecules join together to form one large polymer, with water, or some other small molecule formed at the same time.
3cii)
I. polyamides
Ii. polyacetals
3ciii) CH3−COO−CH2−CH3,
3d)
Allotropy is the existence of a chemical element in two or more forms, which may differ in the arrangement of
atoms in crystalline solids or in the occurrence of molecules that contain different numbers of atoms.
3dii)
a) diamond,
b) graphite
3diii)
Diamond is used for cutting hard substance.
Graphite is used to
make brake linings, lubricants, and molds in foundries






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