Question 3
WAEC
•
2021
•
CHEMISTRY
•
essay
Question Parts
(
a
)
(i) In an experiment, \( 25.0 c m^{3} \) of \( \mathrm{H}_{2} \mathrm{SO}_{4} \) completely neutralized \( 24.0 c m^{3} \) of a 0.150 mol dm \( { }^{-3} \) aqueous KOH using a suitable indicator. Write a balanced chemical equation for the reaction.
(
a
)
(ii) Calculate the concentration of the acid solution.
(
b
)
(i) A burning magnesium ribbon was placed in a gas jar containing carbon (IV) oxide. Write an equation for the reaction.
(
b
)
(ii) Explain briefly why the magnesium ribbon burns in carbon (IV) oxide although the gas does not support combustion.
(
b
)
(ii) Calculate the percentage by mass of nitrogen in magnesium trioxonitrate (V). \( [N=14.0, O=16.0, M g=24.0] \)
(
c
)
(i) Consider the following organic compound: \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CHCOOH} \). State two chemical reactions which could be used to identify the compound.
(
c
)
(ii) What would be observed in each of the reactions stated in 3(c)(i)?
(
d
)
Describe briefly how soap is manufactured using pellets of sodium hydroxide and vegetable oil.
(
e
)
Define the term electronegativity.
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About This Question
This is
Waec
2021
Chemistry
Question 3.
It is one of the
essay
questions from the
2021
Waec
Chemistry
examination.
The question covers
General
.