WAEC Chemistry Practical Specimen 2020 – This page contains the list of Chemistry Practical Specimen and materials that will be used for the May/June 2020 Chemistry Practical Examination. All you need to do is to stay focus and follow me.
The West African Examinations Council is an examination board that conducts the West African Senior School Certificate Examination or University and Jamb entry examination in West African countries.
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WAEC Chemistry Specimen Practical
In addition to the fittings and reagents normally contained in a chemistry laboratory, the following apparatus and materials will be required by each candidate.
- (a) one burette of 50cm³ capacity.
- (b) one pipette, either 20cm³ or 25cm³. All candidates at one centre must use pipettes of the same volume. These should be clean and free from grease.
- (c) the usual apparatus for titration.
- (d) the usual apparatus and reagents for qualitative work. Including the following with all reagents appropriately labelled.
(i) dilute sodium hydroxide solution.
(ii) dilute hydrochloric acid.
(iii) dilute trioxonitrate(v) acid
(iv) silver trioxonitrate(v) solution.
(v) barium chloride solution.
(vi) aqueous ammonia.
(vii) lime water.
(viii) red and blue litmus paper.
(ix) dilute tetraoxosulphate(vi) acid.
- (e) Spatula
- (f) filtration apparatus.
- (g) one beaker
- (h) one boiling tube
- (i) four test tubes.
- (j) the starch solution as indicator.
- (k) mathematical table/calculator
- (l) wash bottle containing distilled/deionized water.
Each candidate should be supplied with the following, where ‘n’ is the candidate’s serial number.
- (a) 150cm³ of sodium trioxosulphur sulphate(vi) solution in a corked flask or bottle, labeled “An”. These should all be the same containing 6.0g of Na2S2O3 per dm³ of solution.
- (b) 150cm³ of iodine in potassium iodide solution in a corked flask or bottle labeled “Bn”. These should all be the same containing 2.5g of I2 and 1.67g of KI per dm³ of solution.
- (c) One spatula full of a uniform mixture of NaCl and CuCO3 in a specimen bottle labelled “Cn”. The components of the mixture should be in the ratio 1:2 by mass
- In all cases, more materials may be issued if required.
- The actual concentrations of A and B must be stated on the Supervisor’s Report form. The candidates will assume that the concentrations are exactly as stated in the question paper.
Here, we will be providing you with the Waec Chemistry practical 2020 past questions and materials that will be used for Examination preparation. Read the answers below.
WAEC Chemistry Practical 2020 Questions & Answers
1. A is 0.100 mol dm-3 solution of an acid. B is a solution KOH containing 2.8 g per 500 cm3.
(a) Put A into the burette and titrate it against 25.0 cm3 portions B using methyl orange as indicator. Repeat the titration to obtain consistent titres. Tabulate your readings and calculate the average volume of A used.
(b) From your results and the information provided above, calculate the:
(i) number of moles of acid in the average titre;
(ii) number of moles of KOH in the volume of B pipetted;
(iii) mole ratio of acid to base in the reaction
[H = 1.00, O = 16.0, K = 39.0]
ANSWER: (a) titration soon.
(b) (i) number of moles of acid = 0.100 x VA
= X mole(s) [3sig. Fig to score]
1000cm3 contains 0.100 mole(s)
VA will contain 0.100 x VA
= X moles [3 Sig. Fig. to score]
(ii) Number of moles of KOH in B
500cm3 of B contains 2.8g of KOH
1000cm3 of B will contain 2.8 x 1000 = 5.6 KOH
Molar mass of KOH = 39 + 16 + 1 or 56 gmol-1
Conc of B = 5.6 = 0.100 mol dm-3
(iii) Mole ratio of acid to base = X: Y to nearest whole number ratio.
2. C is a mixture of two salts. Carry out the following exercises on C. Record your observations and identify any gas(es) evolved. State the conclusion drawn from the result of each test.
(a) Put all of C into a boiling tube and add about 5cm3 of distilled water. Stir thoroughly and filter. Keep both the residue and the filtrate.
(b) To about 2 cm3 of the filtrate, add few drops of Pb(NO3)2(aq)‑Boil the mixture and then allow to cool.
(c) (i) Put the residue in a test tube and add dilute HNO3. Shake the mixture and divide the solution into two portions.
(ii) To the first portion from (c)(i), add NaOH(aq) in drops and then in excess.
(iii) To the second portion from (c)(i), add aqueous ammonia in drops and thein in excess.
|a) C+water, mixture stirred
|Partly dissolves/ soluble Colourless filtrate
White residue (do not accept ppt /solid)
|C contains soluble and insoluble salts|
|b) Filtrate + Pb (NO3)2(aq). Boiled then cooled||White precipitate formed
|Cl-, SO42- or CO32.
|c) (i) Residue + dil HNO3||Effervescence /bubles /gas evolved colourless, odourless gas. Gas turns lime water milky.||CO2 evolved from CO32-|
|(ii) Solution from (c)(i) + NaOH(aq) in drops then in excess||White gelatinous ppt formed. Precipitate dissolves||Zn2+ or A13+
Zn2+ or A13+
|(iii) Solution from (c)(i) + HN3(aq) in drops then in excess||White gelatinous. Precipitate forms. Precipitate dissolves||Zn2+ or A13+
3. (a) Explain briefly the observations in each of the following processes:
(i) when carbon(IV) oxide is bubbled through lime water, it turns milky but the milkiness disappears when the gas is bubbled for a long time;
(ii) a precipitate of calcium hydroxide is insoluble in excess sodium hydroxide solution whereas that of lead (II) hydroxide is soluble.
(b) (i) What is a primary standard solution?
(ii) Calculate the mass of sodium trioxocarbonate(IV) required to prepare 250 cm3 of 0.15 moldm-3 solution.
[Na = 23.0; O = 16.0; C = 12.0]
(c) Name one gas that can be collected by:
(i) upward displacement of air;
(ii) downward displacement of air.
ANSWER: (a) (i): Insoluble CaCO3 formation is responsible for the milkiness produce when CO2 is bubbled through lime water while the disappearance of milkiness is due to the formation of soluble Ca(HCO3)2.
Lime water turns milky with CO2 because CaCO3/ CaCO3(s) is formed. Milkiness disappears when excess CO2 reacts with CaCO3 in the water medium forming the soluble Ca(HCO3)2/ Ca(HCO3)2 (aq).
(ii) Calcium hydroxide is not amphoteric. It does not react with an alkali NaOH whereas lead (II) hydroxide is amphoteric so reacts with excess NaOH.
(b) (i) The primary standard solution is one whose concentration is known and can be used to standardize another solution.
(ii) M (Na2CO3) = 106 gmol-1
m(Na2CO3) = C x M x V
= 0. 15 x 106 x 0. 25
= 3. 98 g
(c) (i) Carbon(IV) oxide, sulphur (IV) oxide, hydrogen chloride, oxygen, nitrogen (IV) oxide, chlorine, hydrogen sulphide.
(ii) Ammonia, oxygen, hydrogen, methane.
SCHEME OF EXAMINATION FOR PRACTICAL CHEMISTRY
There will be three papers: Papers 1, 2, and 3, all of which must be taken. Papers 1 and 2 will be a composite paper to be taken at one sitting.
PAPER 1: Will consist of fifty multiple-choice objective questions drawn from Section A of the syllabus (the section of the syllabus which is common to all countries). It will carry 50 marks and last for 50 minutes.
PAPER 2: Will consist of six essay questions drawn from the entire syllabus. The paper will be put into three sections, Sections A, B, and C.
Section A: Will consist of four questions drawn from Section A of the syllabus.
Section B: Will be for candidates in Ghana only and will be drawn from Section B of the syllabus (ie the section of the syllabus peculiar to Ghana). It will consist of short-structured questions.
Section C: Will be for candidates in Nigeria, Sierra Leone, The Gambia, and Liberia and will be drawn from Section C of the syllabus (ie the section of the syllabus containing material for those countries only). It will also consist of short-structured questions.
Candidates will be expected to answer two questions from Section A and all the short-structured questions from either Section B or Section C.
Each question in Section A will carry 20 marks while the compulsory short-structured questions in Sections B and C will carry 30 marks. The total score will be 70 marks. The paper shall take 1 hour 40 minutes.
PAPER 3: Will be a practical test (for school candidates) or a test of practical work (for private candidates) lasting 2 hours and consisting of three sections: Sections A, B, and C.
Section A: This will consist of two compulsory questions drawn from Section A of the syllabus, each carrying 25 marks.
Section B: This will be for candidates in Ghana only. It will consist of one question drawn from Section B of the syllabus and will carry 30 marks.
Section C: This will be for candidates in Nigeria, Sierra Leone, The Gambia, and Liberia. It will consist of one question drawn from Section C of the syllabus and will carry 30 marks.
Candidates will be expected to answer all the questions in Section A and one question in either Section B or C. The paper will carry a total score of 80 marks.
How to pass WAEC Chemistry Practical
1.HAVE A POSITIVE MINDSET:
It is obvious that until your mindset is positive, your life will not be positive. As you prepare for WAEC 2020, you must develop a positive mindset towards your fate. Don’t say, “WAEC Chemistry practical is very hard I don’t know whether I will pass” and don’t believe anyone that says you cannot pass WAEC Chemistry on your own.
Have the mentality, “If others passed WAEC 2020 Chemistry Practical in the past, then I will be like them. Refuse to be identified with failure or those that failed in the past. Even if this year’s WAEC Exam is not your first time, it doesn’t mean that you cannot pass WAEC 2019 Chemistry this time around. Sit for maths 2020/2021 will a refined mindset. Nothing will make you fail WAEC 2020. Until your mindset is positive, your life will not be positive.
Subscribing for WAEC Expo is less stressful and less time-consuming. In order to be part of the successful WAEC candidate, you have to subscribe to the WAEC expo package by clicking here
2. AVOID BAD COMPANIES
If you are really serious about passing WAEC 2020 Chemistry practical, try and avoid bad companies. They will discourage and engage you in activities that will not enhance your success. Remember that their mindset may not correspond to yours.
3. SET GOOD TARGETS AND PLANS:
If you have made up your mind to pass waec 2020, the next thing you should do is set targets. Write down the type of grades you want in Neco 2020. If you want all As, zero Fs, and Zero Es then you should start planning it now. Make sure you create a timetable and master plan to achieve your set goals. Remember, it takes nothing to dream but it takes everything to focus on your dream.
4. GET RECOMMENDED BOOKS FOR WAEC:
One of your plans should be getting the WAEC 2020 Chemistry recommended textbooks. Normally, the West African Examination Council recommends books for the examination. But apart from WAEC 2020 Chemistry where certain novels are compulsory, you are free to use any good textbook to prepare for WAEC 2020 Chemistry exam. Some topics are more difficult to understand. If you have any topic you are finding difficult to understand, then get another textbook that will make things simple for you.
5. GET WAEC CHEMISTRY PAST QUESTIONS:
This is a very good plan. Since NECO 2020 and WAEC 2020 are of the same standard, you could use the same past questions to study for both. If you are confused about how to get neco or waec past questions. They are sold in good bookshops around. It is possible that the school where you registered could offer to give you some current past questions that will help you in WAEC 2020 Chemistry.
6. START YOUR READING FOR WAEC 2020 :
Stop wasting your time. Now that you have gotten textbooks and past questions, the next thing is to begin your reading. Early reading and practice is good for you; you will pass well on WAEC 2020 Chemistry
7. AVOID SKIPPING EXAMPLES AND EXERCISES:
It is very unfortunate that Secondary school students are fond of skipping exercises and even examples while studying textbooks. They loved notebooks so much that they could ask, “can I read my Chemistry notebook and pass WAEC ?”. Don’t be scared of attempting exercises; they are there to help you. Face it and overcome it!
8. TEST YOURSELF ON CHEMISTRY:
This is a good practice. Once in a while, answer full one-year Chemistry past questions on your own without checking the answers. Then mark to see your score. This will help you in many aspects.
9. DO CONSTANT PRACTICE:
Don’t get discouraged when certain topics are annoying, keep on practicing until you master everything. Never give up and never say never. Keep on keeping on….
10. CREATE TIME FOR RECREATION
Create time for yourself where you play and ease off stresses. Do not overwork yourself; it can make you waste time unnecessarily. One you work more than necessary, you are not gaining anything.
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