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Thursday, May 16, 2024
Chemistry 3 (Practical) (Alternative A) 9:30am – 11:30am (1st Set)
Chemistry 3 (Practical) (Alternative A) 12:00pm – 2:00pm (2nd Set)

TEACHERS REPORT FORM
(2)
(a)
A contains 1.58 g of KMno4 per dm³ of solution
(b) B contains 5.5 g of FeSO4 per dm³ of solution

(3)
(i) 18.10 cm³
(ii) 18.20 cm³
(iii) 18.10 cm³

Average: 18.13cm³

COMPLETED

ATTENTION: In no.1, Candidates must use their school’s endpoint in place of the 18.13 cm³ used.

Use your endpoint also in b(i) to calculate the concentration of B.

(1)

Updated b(i)
Final answer approximately 0.1 mol/dm³

(1bii)

(2)

 

(3a)
(PICK ANY TWO)
(i) Ammonia (NH₃)
(i) Oxygen (O₂)
(ii) Carbondioxide (CO₂)
(iii) Nitrogen dioxide (NO₂)
(iv) Chlorine (Cl₂)
(v) Hydrogen sulfide (H₂S)

(3b)
(i) Pipette
(ii) Burette

(3c)
To protect laboratory personnel or users from inhaling hazardous substances.

(3d)
(PICK ANY THREE)
(i) Lab Coats.
(ii) Gloves.
(iii) Face shield.
(iv) Safety goggles
(v) Chemical-resistant aprons.

OR

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VITAL INFO FOR CHEMISTRY PRACTICAL

NOTE: Endpoint is also know as Average Titre Value!

Your School’s Endpoint is the most important factor in marking your practical chemistry.

By now, your school chemistry teacher should have briefed you on this.

Every school have different or similar endpoint.

What matters most is that all chemistry students in a particular school used the endpoint which their chemistry teacher gave them. Don’t use other school’s own no matter what. If you get answer from anywhere, replace their end point with ur school’s own and re-calculate when required.

In a particular school, each candidates’ end point should not vary with figure higher or lower than 0.2

This is what I mean: If your school got 20.00cm³ as the average titre value (end point).
Every chemistry student of that school should be getting within that 20.00 and should not be higher with more than 0.2 or less than 0.2.

If Obi’s own is 20.00, Ada’s own can be 20.10, 20.20, 19.80, 19.90, 19.95, 20.15, etc.

USE YOUR SCHOOL’S AVERAGE TITRE VALUE.
REPLACE MY ENDPOINT OR TITRE VALUE WITH YOUR SCHOOL’S OWN.

WAEC will mark your chemistry practical with the practical report teachers will submit.

IF YOU ARE A CHEMISTRY TEACHER OR YOU ARE THE ONE IN CHARGE OF YOUR SCHOOL EXAM, AND YOU WANT TO USE MY WORK, MAKE SURE ALL CANDIDATES THERE USE NY ENDPOINT BUT SHOULD VARY THEIR WORK WITH SMALL DIFFERENCES LIKE I SAID ABOVE. AND ALSO MAKE SURE YOU WROTE MY ENDPOINT IN YOUR PRACTICAL REPORT PAPER!

I MIGHT STILL EDIT THIS UPDATE FOR BETTER UNDERSTANDING. BUT IF YOU ARE A CHEMISTRY STUDENT, U SHOULD KNOW ABOUT THIS.
 

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