WAEC GCE 2018 Chemistry (Obj & Essay) Answer - Nov/Dec Expo

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Chemistry OBJ:

1-10: CCDBACBABA

11-20: BDDDCDBAAA

21-30: CAADCCCAAB

31-40: CBBCABCDBC

41-50: BACCAABACC




(1a)

Gas > liquid > Solid


(1aii)

Solid > liquid > gas 


(1bi) 

PH>7


(1bii) 

PH>7


(1ci)

(I) Magnesium from 0 to +2

(II) Hydrogen changes from 1 to 0


(1cii) 

I ---> Magnesium is oxidized

II ---> Hyfrogen is reduced 


(1ciii) 

HCL


(1di) 

(i) Boiling occurs throughout the entire volume while evaporation occurs at the surface 

(ii)It involves the formation of bubbles while evaporation does not form bubbles


(1dii)

It decreases the boiling point as the boiling point of water is proportional to the magnitude of atmosphere pressure. 


(1e) 

It dictates the rate of reaction and also optimize the amount of product formed. 


(1f) 

C3H7CooH ---> Butanoic acid 

(CH3)3COH ---> Butan-1-ol


(1g) 

Functional groups are responsible for their different chemical behavior or properties so that organic compounds with smaller functional group would behave similarly. 


(1h)

Solids in liquid:

(i) It depends on the nature of temperature changes or exothermic or endothermic as affect by the temperature of the liquid. 

(ii) The surface area of solid is lesser, they dissolves  less as compound to gases in the  same volume. 

(iii) Pressure does not affect the solubility of the solids


Gas in liquid:

(i) It depends on the average kinetic energy as affect by temperature of the liquid.  

(ii) The surface area of gases are higher so they dissolve more in a given volume of water. 

(iii) The solubility of gases is a direct consequences of pressure changes due to the partial pressure of the gas molecules.

============================≠========°=°====

(2i)

C = 0.48 H = 0.8 Cl = 1.42

H

C = 1 H = 1 Cl = 35.5

C = 0.48/12

H = 0.08/1 

Cl = 1.42/35.5


0.04/0.04 , 0.08/0.04 , 0.04/0.04


Therefore CH2CL

The electrical formular = CH2CL


(2aii)  The molar mass of the compound is 99

Hence (CH2CL)n = 99

(12 + 2C1)  + 35.5)n = 99

12 + 2 + 35.5

(495)n = 99

Therefore n = 2

Hence the molar formula = (CH2CL)2

C2H4CL2


(2b) 

(I) it is soluble in water and in other polar solvents.

(II) Nacl(s) when  dissolve in water ionized to form Na+ and Cl-

(III) the  aqueous solution of Nacl(s) can be use as n electrolyte


(2ci) DRAW THE DIAGRAM 

(2cii)

(i)Eq1- actuation energy for in catalyzed reaction

(ii)Eq2 -  actuation energy for catalyzed reaction

=========================================


5ai)

i)CO

ii)CO2

5aii)

It is because there is increasing surface area of the broken coal than in the lumps of coal

5aiii)

CH4

5aiv)

Coke

5bi)

SO2

5bii)

MnO2

5aiii)

Na2O

5aiv)

Al2O3

5av)

NO2

5ci)

Cl2+FeCl----->FeCl3


5cii)

Radox reaction

5civ)

Reason: the oxidation number of iron increases from +2 to +3 oxidation, and the oxidation number of chlorine decrease from 0 to - 1

5di)

A- delivery tube

B- quicklime 

5dii)

2NH2 Cl2(s)+ Can(OH)2(s)----->CaCl2(s)+2H2O(s)+2NH3(g)

5diii)

Ammonia

5div)

To prevent sucking back

5dv)

To absorb or dry the ammonia gas

5e)

Bitumen


CHEMISTRY ANSWER LOADING.................



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