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WAEC 2018 CHEMISTRY OBJ AND THEORY ANSWERS – MAY/JUNE EXPO


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1ai)
Fermentation is the process in which a substance breaks down into a simpler substance. Microorganisms like yeast and bacteria usually play a role in thefermentation process, creating beer, wine, bread, kimchi, yogurt and other foods. Fermentation comes from the Latin word fermentare, meaning “to leaven.
1b.)
i. deltons law of partial pressure tates that in a mixture of non-reacting gases, the total pressureexerted is equal to the sum of thepartial pressures of the individual gases.

1aii)
oli silicon dioxide
1b)
– strength of an acid
– the ph of the solution
1c)
Fe+H2SO4->FESO4 + H2
H2SO4=10cm^3
Concentration=1mol/dm^3
Amount=Vol * Concentration
=10/100*1
=0.01mol
1mol=56g
0.01mol=56*0.01
=0.56g
Mass of unreacted=5-0.056
=4.44g
1di)
copper (ii) tetraoxsulphate(iv)
1dii)
dyes
======

Section B
2a. The collision theory states that when suitable particles of the reactant hit each other, only a certain percentage of the collisions cause any noticeable or significant chemical change; these successful changes are called successful collisions. The successful collisions must have enough energy, also known as activation energy , at the moment of impact to break the preexisting bonds and form all new bonds. This results in the products of the reaction. Increasing the concentration of the reactant particles or raising the temperature, thus bringing about more collisions and therefore many more successful collisions, increases the rate of reaction.
=================
4aii) Cu(s) + 2H2SO4(l) → CuSO4(aq) + 2H2O(l) + SO2(g)
=========

4aii) Cu(s) + 2H2SO4(l) → CuSO4(aq) + 2H2O(l) + SO2(g)
===================
(5a)
DRAW THE GRAPH
(5b)
Movement of goods and services
-Movement of people
-Development of tourism
-Opening up new lands and areas
-Generation of revenue
(5c)
-It is very costly to build and maintain
railways
-Railway transport is relatively slow in
some other areas
-Railway network is generally poor





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