WAEC GCE Chemistry Practical Questions 2020 | Check Answers Here.
WAEC GCE Chemistry Practical Questions 2020: Chemistry Practical WAEC GCE Expo Questions is out now on our website. In this article, I will be showing you past WAEC GCE Chemistry Practical random repeated questions for free.
You will also understand how WAEC GCE Chemistry Practical questions are set and many more examination details. All you need to do is to stay focus and follow this guide.
The West African Examinations Council (WAEC) is an examination board that con9ducts the West African Senior School Certificate Examination, for University and Jamb entry examination in West Africa countries. … In a year, over three million candidates registered for the exams coordinated by WAEC.
WAEC GCE Chemistry Questions 2020
A->To dry the gas
B->To detect the type of gas that was dried
B->KMno4/Blue litmus paper
-It is an acid that turns moist blue litmus paper red
-It is colourless and poisonous gas with an irritating smell
The irritating smell
Chlorine gas (Cl2(g))
Inference: SO3^2- suspected
(i) Inference: insoluble salt
(ii) Inference: SO3^2- confirmed
(iii) Inference: Cu2 suspected
-Blue gelatineous precipitate
(ii) Copper (ii) trioxosulphate (iv)
burette reading/cm^3 ___ 1 ____ 2 _____ 3
final reading__________ 39.5 __ 29.80 __ 19.40
initial reading ______ 19.55 __ 10.50 ___ 0.0
volume of E used _____ 19.70 ___ 19.30 __ 19.40
ii) Na2CO3(aq)^2HNO3(aq) — 2NaNO3(aq) + CO2(g) + H2O(c)
average volume of E used = 19.70+19.30+19.40/3
(1) A student adds a known mass of magnesium ribbon to 100 cm3 of dilute hydrochloric acid (an excess) in the apparatus shown below. Hydrogen gas is evolved. The time taken to collect 48 cm3 of gas at room temperature and pressure is measured.
(a) (i) Name apparatus A.
(ii) Name apparatus B.
(b) (i) Calculate the number of moles of hydrogen in the 48 cm3 of gas.
[1 mole of any gas occupies 24 000 cm3 at room temperature and pressure.]
(ii) Use the equation below to deduce the mass of magnesium used in the experiment to produce 48 cm3 of hydrogen at room temperature and pressure. [Ar : Mg, 24]
Mg + 2HCl MgCl2 + H2
(c) Give a test for hydrogen gas.
(d) What is the effect on the time taken to collect the same volume of gas if,
(i) large lumps of the same mass of magnesium are used instead of magnesium ribbon,
(ii) the reaction is carried out at a higher temperature?
2(a) A student investigates the electrolysis of aqueous copper(II) sulfate using graphite electrodes and the apparatus shown below.
(i) What is observed at electrode R?
(ii) Construct the equation for the reaction taking place at electrode R.
(iii) When graphite electrodes are used a colour change is seen in the solution. What is this colour change? Explain why it happens.
(iv) When graphite electrodes are used, a gas is evolved at one of the electrodes. Name the gas and give a test for the gas.
(v) If the graphite electrodes are replaced with copper electrodes, no colour change is seen on electrolysis of the solution. Explain why.
(b) The student does more experiments using the apparatus in (a) with graphite electrodes
but, in each case, using a different electrolyte.
Complete the table below.
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