WAEC Chemistry Practical Questions and Answers 2022/2023. Due to a lack of understanding of the questions, many WAEC applicants struggle to correctly answer the WAEC Practical Chemistry Alternative A and B questions. I’ll show you how to answer the 2022 WAEC Chemistry Practical questions correctly so you may get a decent result on your Chemistry exam.
Before tackling any questions, it is critical that you grasp the WAEC Chemistry Practical Making Scheme in order to present your answers in such a way that they would appeal to the examiner and get you high marks.
Keep in mind that each process receives a grade. So, when reporting and presenting your practical outcomes, make sure you don’t neglect any steps.
WAEC English Language Questions and Answers 2022/2023 (Essay and Objectives)
The Chemistry Practical question paper will be divided into two portions, each with a set of general chemistry questions:
- Quantitative Analysis
- Qualitative Analysis
These include titration and ion tests. You will be required to conduct an experiment and submit your findings and inferences. What you’ll see is very similar to the WAEC Chemistry Specimen your school received.
Your Chemistry teacher will provide you with your titration endpoint. It is not the same for all schools, but it falls within a certain range.
This is not the place to use the endpoint. It may differ from your center endpoint, but the calculating techniques can be followed.
WAEC Practical Chemistry Questions and Answers (Expo)
3ai)The value will increase
(3aii)The occur as a result of the decrease in the concentration of base due to the added volume of water
(3bi)There will be no visible reaction because copper is less than Zinc in the electrochemical series
3ai)The price will rise.
(3aii)The arise as a result of the increasing volume of water lowering the concentration of base.
(3bi)Because copper is less than zinc in the electrochemical series, there will be no observable reaction (3bii)
Because it is hygroscopic, it absorbs water and becomes sticky (3biii)
The solution takes on a pink hue.
WAEC Biology Questions and Answers for 2022/2023 (Theory and Objectives)
(3c)A white precipitate is generated when NaOH is added to a zn3+ solution, which later dissolves in excess NaOH due to the production of zinc.
All of your burette readings (both beginning and final) as well as the size of your pipette must be documented, but there is no need for an account experiment process. You must complete all computations in your response booklet.
1. A is a potassium tetraoxomanganate solution (VII). B is a solution of iron (II) chloride in 250cm3 containing 4.80 g of the salt. (a) Fill the burette with A. In a conical flask, pipette 20.0cm3 or 25.0cm3 of B, add 20.0cm3 of H2SO4(aq), and titrate with A. To get concordant titire values, repeat the titration. Calculate the average volume of A consumed by tabulating your results. MnO–4(aq) + 5Fe2+(aq) + 8H+(aq) > Mn2+(aq) + 5Fe3+(aq) + 4H2O is the reaction’s equation (I)
(b) Calculate I the concentration of B in moldm-3; (ii) the concentration of A in moldm-3 using your results and the information supplied. (iii) quantity of Fe2+ moles in B pipetted volume [FeCI2 = 127 gmol-1] For precise observations and appropriate inferences, credit will be given for careful adherence to the illustrations. All tests, observations, and inferences must be written down in ink in the booklet at the time of execution.
2. The salts C and D are inorganic. Perform the activities below on them. Make a note of your findings and any gas(es) that have emerged. Declare your conclusions and make inferences based on the results of each test. (a) In a test tube, combine all of C and about 5cm3 pure water. Shake vigorously, then use litmus paper to test the resulting solution. Divide the mixture into three equal parts. I Add NaOH(aq) in drops to the first section, then in excess. (ii) Add NH3(aq) in drops to the second component, then in excess. (iii) Add AgNO3(aq) and HCI(aq) to the third portion (b) I In a test tube, combine all of D and around 5cm3 pure water. Shake the test tube vigorously and feel it. (ii) Add HCI to about 2cm3 of the solution (aq).
3. Describe the results of each of the following reactions in the laboratory: (a) mixing 2cm3 of bench H2SO4(aq) with 2cm3 of barium chloride solution; (b) mixing 2cm3 of dilute hydrochloric acid with 1 g of powered iron(II) sulphide (FeS); (c) mixing 2cm3 of dilute hydrochloric acid with 1 g of iron filings and allowing to stand for a
WAEC Animal Husbandry Questions and Answers 2022/2023 (Essay and Objectives)
ANSWERS
1. Equation of the reaction: MnO–4(aq) + 5Fe2+(aq) + 8H+(aq) > Mn2+(aq) + 5Fe3+(aq) + 4H2O(I)
The questions above are strictly for practice, not tomorrow’s Chemistry expo.
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Today’s Practical Chemistry Answers
(2020 Answers)
3ai)
oxygen
(3c)
It turns blue litmus paper red.
3d
Pure copper(II) sulfate is white. It is also known as anhydrous copper(II) sulfate because it has no water in it. When water is present in a sample of copper(II) sulfate it turns blue. … This colour change can be used to detect the presence of water (or water vapour).
3c(i)
When exposed to light, silver chloride decomposes into gray metallic silver and chlorine. The light sensitivity of the silver chloride and other silver halides, such as silver bromide and silver iodide, forms the basis of the photographic process.
WAEC Animal Husbandry Questions and Answers 2022/2023 (Essay and Objectives)
3bi()
Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions. ..
3c(i)
When exposed to light, silver chloride decomposes into gray metallic silver and chlorine. The light sensitivity of the silver chloride and other silver halides, such as silver bromide and silver iodide, forms the basis of the photographic process.
3cii
The ammonia combines with silver ions to produce a complex ion called the diamminesilver(I) ion, [Ag(NH3)2]+. This is a reversible reaction, but the complex is very stable, and the position of equilibrium lies well to the right.
3d
Pure copper(II) sulfate is white. It is also known as anhydrous copper(II) sulfate because it has no water in it. When water is present in a sample of copper(II) sulfate it turns blue. … This colour change can be used to detect the presence of water (or water vapour).
Remember what I said: If you don’t want to be a scapegoat, use your school endpoints. Your teacher will be the one to report, and any endpoint he reports will be considered accurate. While you’re copying, make sure your eyes are bright. Goodluck
(1a)
Burette reading (cm)³|1st reading|2na Reading|3rd reading|
Final |15.25|30.53|45.79|
Initial |0.00|15.25|30.53|
Volume of acids used |15.25|15.28|15.26
Average volume of acid used =15.25+15.26/2
=15.255cm³
=15.26cm³
Or =15.27cm³
(1b)
Given; mass con of A =5g/500cm³ = 5g/0.5dn³
CA=10g/dm³
A is HNO3
Therefore molar mass =1+14+(16*3)=15+48=63g/mol¹
Molarity of A = gram con/molar mass
CA=10/63=0.1587mol/dm3
(1bii)
Using CAVA/CBVB =Na/NB
With reacting equation ; HNO³ + NaOH—NaNO3+H2O
nA=1 nB=1
0.1587*15.26/CB*25.00=1/1
25CB=0.1587*15.26
CB=0.1587*15.26/25
CB=0.09687mol/dm³
(1biii)
B is NaOH
Molar mass
23+16+1=40g/mol
Conc of B in g/dm³=molarity * molar mass
= 0.09687*40
=3.8748g/dm³
(1biv)
No of moles present in 250cm³ of NaOH is =molar conc * volume
=0.09687*250/1000
=0.0242moles
Mole ratio of NaOH and NaNO3 is 1;1
No; of mole of NaNO3 which reacted is 0.0242
Mass of NaNO3 formed =molar mass * no; of moles
=85*0.0242
=2.05grams
(2a)
TEST: C+burning splint
OBSERVATION: Sample C burst into flame .It burns with non smoky blue flame without soot. Colorless gas that turns wet blue litmus paper faint red and turns like water milky is present.
INFERENCE: C is volatile and flammable. The gas is CO2 from combustion of saturated organic compound.
(2bi)
TEST: C + distilled water + shake
OBSERVATION: Clear or colorless solution is observed
INFERENCE: C is miscible with water
(2bii)
TEST: C + Acidified K2Cr207
OBSERVATION: Orange color of K2Cr207 solution turns pale green and eventually pale blue on cooling
INFERENCE: C is a reducing agent
(2C)
TEST: D + C + 10% NaOH + Shake
WAEC Data Processing Questions and Answers 2022/2023 (Essay and Objectives)
OBSERVATION: D dissolves slowly in C and produces reddish brown solution. Reddish brown solution turns yellow precipitate. The precipitate has an antiseptic odour
INFERENCE: D is soluble in organic solvents
(2d)
Compound belongs to the class of secondary alkanol
=====================================
(3ai)
Zinc nitrate
(3aii)
2 Zn(NO 3 )2 —–>2 ZnO + 4 NO 2 + O 2
(3aiii)
It turns white when cold from it yellow colour when it was hot
(3b)
Pipette / measure 50.0cm3 of the stock solution into a 250
cm3 volumetric flask (containing some distilled water). Shake / swirl and add more distilled water until the mark is reached.
(3c)
Al2(SO4)3 – turns blue litmus red
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