WAEC GCE Pass Mark Chemistry Practical Obj/Essay and Answers

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WAEC GCE Pass Mark Chemistry Practical Obj/Essay and Answers | Our able team has pu in place all necessary measures to help candidate pass this waec gce examination. 7ytyFurthermore, this page is solely for candidates about to sit for GCE chemistry practicals specimen and also the objective and essay part of the exam. Similarly candidate will learn about WAEC GCE Pass Mark Chemistry Practical Obj/Essay and Answers – Before we commence candidate should first Check Here.

Confirm 2018 WAEC GCE Chemistry Practical Specimen

The Waec Gce chemistry specimen for 2018 practical exam released. The General Certificate Examination (GCE) for August/September Waec Chemistry alternative to practical paper written on Friday, 14th September, 2018 from 9:30am to 11:00am.

WAEC GCE Pass Mark Chemistry Practical Obj/Essay and Answers

WAEC GCE Pass Mark Chemistry Practical Obj/Essay and Answers

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.

WAEC GCE Pass Mark Chemistry Practical Obj/Essay and Answers

(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.

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WAEC GCE Pass Mark Chemistry Practical Obj/Essay and Answers

(d) Also, 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.

WAEC GCE Pass Mark Chemistry Practical Obj/Essay and Answers

  1. (i) First and foremost, whats observed electrode R?
  2. (ii) Secondly. construct equation for reaction taking place at electrode R.
  3. (iii) When graphite electrodes re used a colour change is seen in the solution. What is this colour change? Explain why it happens.
  4. (iv) When graphite electrodes re used, a gas is evolved at one of the electrodes. Name the gas and give a test for the gas.
  5. (v) If the graphite electrodes re 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.

WAEC GCE Pass Mark Chemistry Practical Obj/Essay and Answers

waec chem practical | Sharp WAEC GCE Chemistry Practicals Questions and Answers

WAEC GCE Pass Mark Chemistry Practical Obj/Essay and Answers

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