WAEC GCE Chemistry Practical Questions and Answers 2023/2024 | Alternative to Practical Specimen

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Waec gce Chemistry practical specimen 2023 questions and answers can be seen here. The WAEC Chemistry to practical question paper will be brought in for the exam on Tuesday, 12th December, 2023 from 2:00 pm to 3:30 pm.

The Chemistry 3 Practical exam is held from 2:00 pm to 3:30pm. We are writing this post to show the Waec Chemistry specimen from the provided yellow paper, Waec Chemistry practical drawings, and materials that were used in the WAEC Chemistry practical exam past questions and syllabus.

WAEC GCE Chemistry Practical Questions and Answers Expo

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WAEC GCE Chemistry Practical Expo

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WAEC GCE Chemistry Specimen 2023

Paper 3 (Alternative To Practical)
Answer Three questions.
Write your answers in the spaces provided.

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 the 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.

Note: The answers below are the 2020 Nov/Dec answers.

Practice Questions

The questions below are strictly for practice, not the 2023 Chemistry Expo.

All your burette readings (initials and final), as well as the size of your pipette, must be recorded but no account of experimented procedure is required. All calculations must be done in your booklet.

1. A is O.200 moldm³ of HCI. C is a solution containing 14/3_g of Na₂CO₃. x H₂O in 500 cm³ of solution. (a) Put A into the burette and titrate it against 20.0 cm³ or 25.0 cm³ portions of C using methyl orange as an indicator. Repeat the titration to obtain Consistent titre values. Tabulate your results and calculate the average volume of A used. The equation for the reaction is: Na₂CO₃ x H₂O + 2HCL_(aq) → 2NaCI_(aq) + CO2_(g) + (x+1) H₂O_(I).

(b) From your results and the information provided. Calculate the: (i) concentration of C in moldm^-3; (ii) concentration of C in gdm^-3; (iii) molar mass of Na₂CO₃, xH₂O; (iv) the value of x in Na₂CO₃ xH2O. [H = 1.0; C=12.0; O = 16.0; Na =23.0]

Credit will be given for strict adherence to the instruction, for observations precisely recorded and for accurate inferences. All tests, observations and influences must be clearly entered in the booklet in ink at the same time they are made.

Conclusion 

Please note that the answers presented in this post are a guide to the forthcoming General Certificate Examination (GCE). We have prepared it to aid the student in preparing for the practical. If you have any questions about the WAEC GCE 2023 Chemistry Practical questions and answers, kindly let us know in the comment box

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