WAEC Chemistry Practical (ALTERNATIVE A) Questions And Answers 2024

WAEC Chemistry Practical (ALTERNATIVE A) Questions And Answers 2024

WAEC Chemistry (Practical) (Alternative A) answers for the WAEC May/June Exam is out. If you are a science student looking for WAEC Chemistry Questions 2024 Verified Answers, here is the solution you are looking for that will help you get good result. The West African Examinations Council (WAEC) is a regional examination body that conducts standardized tests for English-speaking West African countries.

 

Is WAEC Chemistry Practical Questions 2024 Answers Out?

 

Yes

 

The WAEC 2024 expo on Chemistry Practical Questions 2024 answers are out. The West African Examinations Council has released both the questions and answers for the practical scheduled for Thursday, May 16, 2024. You can access all the updated answers for free.

 

NUMBER 1 (TYPED VERSION)

 

(1a)

TABULATE PLEASE

Burette | Rough| 1st | 2nd

Final reading(cm³) | 19.00 | 18.10| 18.10|

Initial reading(cm³) | 0.00| 0.00| 0.00

Volume of A used(cm³) | 19.00| 18.10| 18.10|

Average titre = 18.10+18.10/2
= 18.10cm³

 

(1bi)

 

Conc. of B in mol/dm³ = ??
Ca = 0.200mol/dm³, Va = 18.10cm³
Na= 1, Nb = 5, Vb= 25.00cm³ , Cb= ??

CaVa/CbVb= Na/Nb

Cb = CaVaNa/VbNb

Cb= (0.200*18.10*5)/(25.0*1)
Cb= 0.724mol/dm³

 

 

(1bii)

 

Con. of B in g/dm³ = ??
Con.(g/dm³) = Mass*1000/volume

= 3.8*1000/250
= 15.2g/dm³

 

 

(1biii)

 

FeSO₄<—> Fe²⁺ + SO₄²⁻
1 mol of FeSO₄ 1mol Fe²⁺
0.724mol/dm³ xmol/dm Fe²⁺

x= 1*0.724 = 0.724mol/dm³

Mole= Con.*Vol/1000

Mole = 0.724*250/1000
Mole= 0.181mol

Mass= mole * m.m
= 0.181*56
= 10.136g

 

 

(1biv)

 

Percentage= 10.136*100/15.2
= 66.7%

 

====================

 

NUMBER 2

 

(2a)

 

WAEC Chemistry Practical (ALTERNATIVE A) Questions And Answers 2024

 

 

When all of C is added to a test tube with about 10cm³ of distilled water and shaken, the mixture is filtered. The residue and the filtrate are obtained.

Observations:
The residue: This will contain the insoluble salt(s) present in C.

The filtrate: This will contain the soluble salt(s) present in C.

 

(2bi)

 

Heating about 2cm³ of the filtrate in a boiling tube strongly.

Observations:
If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the filtrate.

The gas evolved is likely carbon dioxide (CO₂).

 

(2bii)

Adding dilute HCl to half of the residue in a test tube.

Observations:
If there is effervescence (bubbling), it indicates the presence of a carbonate salt in the residue.
The gas evolved is likely carbon dioxide (CO₂).

 

(2biii)

Adding aqueous NaOH in drops, then in excess, to about 2cm³

Observations:
If a white precipitate forms upon adding NaOH drops, and it dissolves upon excess addition of NaOH, it indicates the presence of a metal hydroxide in the solution.

 

(2biv)

 

Adding aqueous ammonia in drops, then in excess, to another 2cm³ of the clear solution from (ii).

 

Observations:

If a colored precipitate forms upon adding ammonia drops, and it dissolves upon excess ammonia addition, it indicates the presence of a metal hydroxide in the solution.

====================

NUMBER 3

(3a)

 

(i)ammonia (NH₃)
(ii)carbon dioxide (CO₂).

(3b)

 

(i)A graduated pipette
(ii) A burette can be used.

 


(3c)

 


A fume cupboard in a laboratory is used to provide ventilation that limits exposure to toxic fumes, vapors, or dust.


(3d)

 

(i)safety goggles.
(ii)lab coats.
(iii)gloves.

COMPLETED!!!
=====================================

WAEC CHEMISTRY PRACTICAL SPECIMEN.

WAEC Chemistry Practical (ALTERNATIVE A) Questions And Answers 2024 WAEC Chemistry Practical (ALTERNATIVE A) Questions And Answers 2024 WAEC Chemistry Practical (ALTERNATIVE A) Questions And Answers 2024 WAEC Chemistry Practical (ALTERNATIVE A) Questions And Answers 2024

Comments

No comments yet. Why don’t you start the discussion?

Leave a Reply

Your email address will not be published. Required fields are marked *