2024 WAEC GCE FIRST SERIES CHEMISTRY: (8431)

CHEMISTRY PRACTICAL ANSWER..

(Q1ai, aii and 1b) 

(1ai)

Burette reading; |1|2|3|

Final reading; |14.45| |38.65|

Initial reading; |1.80• 14.45| |

Titre value; | |12.15|12.05|

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 (3a) Na2Co3 and CaCO3

(3b) Na2CO3 +2HCl–> 2NaCl + H2O + CO2.......

(3bi)

Calcium trioxocarbonate iv.

Zinc trioxocarbonate.

(3bii)

NH4Cl.

KHSO4.

(3biii)

A solution consists of a solvent and a solute. The solvent is the major part of the solution, in this case water, and the solute is the minor component, in this case the salt.

(3C) 

Sublimation.

Crystallisation.

Distillation.

Differential Extraction.

Chromatography.

Pick 4

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(3d)

(i) Distillation process, (ii) Crystallization, 

(iii) Chromatography 

(iv) Extraction process.

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(3a)Na²CO³ and CaCO³.

(3bi) (Na²CO³ + 2HCl --------> 2NaCl + H²O + CO².

(3bii)K²CO³ and Na²CO³.

(3biii)NH⁴Cl and KHSO4

(3c)It's a hydrolysis reaction. 

(3d)

(i) Distillation process, (ii) Crystallization, 

(iii) Chromatography 

(iv) Extraction process.

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CHEMISTRY

01-10: ABCBDACBDB

11-20: BAACDBABCA

21-30: DBACAABDDC

31-40: BCBACBBACB

41-50: DBBADABDBB

COMPLETED

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(5cii)

(i) Natural gas: exists already formed in the earth, and is obtained by boring tube wells, similar to petroleum wells. 

(ii) Producer gas: is made by forcing air through a bed of incandescent coal or coke, in specially constructed furnaces.

(5ciii)

(i) water gas is mixture of carbon monoxide and hydrogen gas, producer gas is mixture of nitrogen gas and hydrogen gas.

(ii) Water gas high calorific value than producer gas.

(iii) Water gas is used for the synthesis of many compounds like methanol,methane etc where as producer gas is used only as a fuel gas

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

(3a)

(3b) 

(I) activation energy, in chemistry, the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo chemical transformation or physical transport.

(ii) An ineffective collision (A) is one that does not result in product formation. An effective collision (B) is one in which chemical bonds are broken and a product is formed

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

(1a)

Electrolysis is the chemical decomposition of compound which takes place when an electric current is passed through either a solution or the molten form of the compound.

(Use this No 1b is more Accurate) 

(1b)Rate of Chemical Reaction is the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.

(1c)

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