2022 Waec Chemistry practical specimen: If you are a candidate who is in great need of 2022 Waec Chemistry Practical Specimen then you are at the right blog because we try to make sure all our viewers and candidates study hard to pass with proper information.
The 2022 Chemistry practical specimen for 2022 is now officially released for all Waec candidates Check the official Waec 2022 which is released today below.
Is the 2022 Waec Chemistry practical specimen released? Yes, the 2022 Waec Chemistry Practical Specimen For all Waec Candidates has been officially Released. Ghana, Nigeria, Sierra Leone, The Gambia, and Liberia 2022 Waec Chemistry Practical specimen has been officially released today.
Each Candidate should be provided with the following groups of specimens.
Instructions to Schools
- Great care should be taken to ensure that the information given below does not reach the candidates either directly or indirectly before the examination
2. In addition to the fittings and reagents normally found in a chemistry laboratory, the following apparatus and materials will be required by each candidates
(a) One burette of 50cm₃ capacity
(b) One pipette, either 20cm₃ or 25cm₃. (All candidates at one centre must use pipette of the same volume. These should be clean and free from grease)
(c) The usual apparatus for titration
(d) The usual apparatus and reagent for qualitative work including the following with all reagents appropriately labeled
- 10% dilute sodium hydroxide solution
- Dilute hydrochloric acid
- Dilute trioxonitrate(V) solution
- Silver trioxonitrate(V) solution
- Acidified potassium dichromate solution
- Aqueous ammonia
- Lime water
- Red and blue litmus paper
- Dilute tetraoxosulphate(VI) acid
- Aqueous barium chloride
- Filtration apparatus
- One beaker
- One boiling tube
- Four test tubes
- Starch solution indicator
- Glass rod
- Wash bottles containing distilled/deionized water
- Burning splint
- Watch glass
- Bunsen burner/source of heat
3. (a) 150cm₃ of iodine solution in a corked flask or bottle labeled ‘An’. These should all be the same containing 25.4g of I₂ in 6.0g KI per dm₃ of solution
(b) 150cm₃ of sodium thiosulphate pentahydrate solution in a corked flask or bottle labeled ‘Bn’. These should all be the same containing 24.82g of Na₂S₂O₃ per dm₃ of solution
(c) One spatula of ammonium ferrous sulphate, (NH₄)₂Fe(SO₄)₂.6H₂O in a specimen bottle labeled ‘Cn’. This must be same for all candidates
- In all cases, more materials may be issued if required
- The actual concentrations of A and B must be stated on the Supervisors report form. The candidates will assume that the concentrations are exactly as stated in the question paper
- It should be noted that schools are not allowed to amend the information provided on the question paper or substitute any substance/solution for those specified in these instructions
ARRANGEMENT AND SERIAL NUMBERS OF CANDIDATES
7. The laboratory places should be numbered serially and the candidates should be allotted these places strictly in the order of their index numbers. The number of every specimen supplied to each candidate should be the same as his or her serial number.
8. If a candidate is absent, his or her serial number should not be allotted as another candidate
9. If the candidate are divided into a number of sets, the serial numbers should be continued through the sets, so that no serial number is repeated
10. At the beginning of the examination, it should be ensured that the candidates record their serial number as well as their index numbers on the front page of their answer booklets.
Conducting the Chemistry Practical Test
- The following announcements should be made to the candidates at the beginning of the examination
“The examiner does not want you to waste your time because you cannot proceed with an experiment. Any candidate, therefore, who cannot get on with the experiment after spending 15 minutes on it, may come to me and ask for help”
- The Chemistry teacher should be allowed to give a hint to a candidate who is unable to proceed with an experiment.
- The following regulations must be strictly adhered to:
- No hint should be announced to the candidates as a whole
- A candidate who is unable to proceed and requires assistance must come up to you and state his or her difficulty. The candidate should be told that the Examiner will be informed of any assistance given in any way.
- A note must be made on the Report Form, of any kind of assistance given to any candidate, with the name and index number of the candidate.
- Report Form are provided separately, on which you are required to state the following:
- Detailed information about the apparatus where necessary
- Any particular difficulties experienced by any candidate, especially if the Examiner would be unable to discover these from the scripts
- Any departure from the specified items which could not be avoided
- Any assistance given to the candidate under the regulations explained in 5 above
- In cases where several set of apparatus are provided for a question and specific information about the apparatus is required by the Examiner, each piece of apparatus about which the information is required, and which may differ slightly for different candidates, must be clearly marked with letter A, B, C, etc. and the corresponding information must be clearly reported, showing which apparatus was supplied to which candidates. The candidate should be instructed to record these letters in their scripts
- A completed Report Form must be enclosed in each envelope of scripts.
CAUTION STATEMENT ON THE TOXICITY OF CHEMICALS
It is important to remind candidates that chemicals could be dangerous when they are not handled properly.
Before the practical examination starts, read out the following statements to candidates:
“Even though care has been taken to select the chemicals you will work with, you are being reminded that chemicals could be dangerous. It is therefore important that you handle them carefully.
Call the attention of your invigilator as soon as you start having any unusual sensation, Wash your mouth thoroughly with plenty of water, should any chemical get into it. Remember to wash your hand thoroughly as soon as you finish handling the chemicals.”
It is, however,expected that you will put the appropriate arrangement in place to prevent the occurrence of any accident.
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