Here is the waec gce chemistry practical answers 2021. PLS share and allow notifications so you can get notified when we update this post.
1)
TABULATE
BURETTE READING(cm): 1| 2| 3|
FINAL READING: 21.50| 22.40| 32.20|
INITIAL READING: 2.50| 4.00| 13.60|
VOLUME OF A USED: 19.00| 18.40| 18.60|
Average of A used = 18.40+18.60/2 = 18.50cm³
(1bi)
Using CAVA/CBVB = nA/nB
0.086*18.50/CB*20.00 = 2/1
CB = 0.086*18.50/2*20.00 = 0.039775mol/dm³
(bii)
No. Of moles of I2 = Volume * molarity
= 1*0.06
= 0.06moles
(biii)
Gram Conc. of hydrocarbon = 4.8/1 = 4.8g/dm³
Molarity = Gram Conc./Molar mass = 4.8/80 = 0.06mol/dm³
(3a)
(i) Fehling’s solution
(ii) Ferric chloride
(iii) Million’s reagent
(iv) Ammoniacal solution of copper(i)chloride
(3b
This can be done by pouring hot water on the neck of the bottle which loosens the stopper by weakening the inter-molecular forces in between.
(3ci)
Equivalence point is the point in a titration where the amount of titrants added is enough to completely neutralize the analyst solution.
(3cii)
(i) Spatula; It is used for scraping, transferring, or applying powders and paste-like chemicals or treatments
(ii) Crucible; It is used to burn, melt or mix solid chemical compounds over a burner.
(iii) White tile; it is placed underneath a conical flask to aid with the ease of spotting the end point colour change.
(3ciii)
(i) This is because distilled water change the concentration of the initial solution
(ii) In order to measure the amount of solution added in or drained out
(3di)
(i) Ethene
(ii) Butyne
(3dii)
N₂, CO₂, NH₃
Molar Conc. = 0.06mol/dm
Federal University of gushua school fees for the 2022/2023 academic session Federal university gushua School…
School of Nursing NAUTH Unizik Admission 2023 School of Nursing Admission Form for the 2022/2023…
School of Nursing Niger Delta University Admission 2023 Before applying for admission, the Management of…
Imo State College Of Nursing And Midwifery Owerri Admission 2023 The admission form for the…
15 Topic Ideas for an Argumentative Essay Students have to write a great variety of…
How to Register with Million Money Welcome to Myscholarshipbaze, home of educative content, on this…
View Comments
thank you all official of this site for your support to student across the nation worldwide, pls continue to carry us along Almighty God will bless each our every one of you.
Thanks
your's faithfully
michael Joseph Barnaby
09065503527.