18/08/2023
অক্সি এসিড ও এর নামকরণ। Class: SSC & HSC
১৫ মিনিটে শতশত এসিডের নামকরণ । Class- SSC & HSC । Chapter-03 (HSC 1st Paper) । Chme Academy
By watching this video, you can learn a lot information about oxiacid and its nomenclature.১৫ মিনিটে শতশত এসিডের নামকরণ । Class- SSC & HSC । Chapter-03 (HSC ...
28/07/2023
https://www.youtube.com/watch?v=GGeK-xDDXC8&t=378s
Class HSC-Organic Chemistry-Starch and Cellulose formation
Starch and Cellulose formation। স্টার্চ ও সেলুলোজের গঠন।পার্থক্য। প্রস্তুতি। বিক্রিয়া। A to Z
প্রিয় শিক্ষার্থী, ৯ম, ১০ম, ১১শ ও ১২শ শ্রেণির রসায়ন ও জীববিজ্ঞান বিষয়ের গুরুত্তপূর্ণ পার্ট স্টার্চ ও সেলুলোজ। এই ভি...
06/04/2023
Inorganic reactions part -1: Chapter-3(Class-XI)
03/07/2022
Concept of Shielding effect & Effective Nuclear charge at ease:
First of all, considering a hydrogen atom which contains only one proton(+ve charged sub atomic particle) in it’s nucleus and an electron(-ve charged sub atomic particle) on it’s 1st orbit. So, the attraction force of nucleus on its outermost electron is almost 100℅, due to the absence of any orbit between the nucleus and 1st orbit.
Well, now considering another one like Sodium atom comprises with a +ve nucleus and 3 orbit containing -ve electrons.
Now, think what is happening with the last electron.
Here, will the attraction force Between nucleus and the last electron of sodium be 100%?
No. As there are 2 orbits present containing electrons between the nucleus and the outermost orbit.
So, some repulsion forces will act on the outermost electron of sodium by the electrons presenting in 1st and 2nd orbits.
As a consequence of repulsive force on the last electron, the attraction force of nucleus will not be equal to 100℅, It will be less than 100%.
This effect is known as shielding effect & the nuclear charge due to shielding is called effective nuclear charge.
If effective nuclear charge is considered as 'Z(eff)', and shielding constant as 'S',
Then, Z(eff) = Z - S,
Where, Z is atomic number.
02/07/2022
Phase-transitions-melting-boiling-and-subliming
Class: VIII, IX & X-Chemistry
https://www.archemacademy.com/phase-transitions-melting-boiling-and-subliming/
29/06/2022
Phosphoric acid(H3PO4) এ কতটি পানির অনু আছে?
উত্তরঃ ২ টি
26/06/2022
Chemical Experiment at Faujdarhat Cadet College Laboratory
25/06/2022
Solubility Definition/ দ্রাব্যতাঃ
Class: XI, XII & HSC:
https://www.archemacademy.com/solubility-definition/
Solubility definition – Chem academy
Definition-1: The number of grams of solute that can dissolve in 100 gm of solvent to make saturated solution at constant temperature is called solubility. It is expressed by the symbol ‘S’.
21/06/2022
Periodic Table and Properties (Power point presentation)
(SSC & HSC students only)
https://www.archemacademy.com/periodic-table/
21/06/2022
CFC & HCFC nomenclature (Class-HSC and B.Sc student)
https://www.archemacademy.com/cfc-hcfc-nomenclature/
24/03/2022
https://youtu.be/6ZzW8d6qfa4
Wurtz reaction! Definition! Explanation! Class XI & XII standard
By this video you will learn about Wurtz reaction! Definition! Explanation! Class XI & XII standard.
23/03/2022
https://youtu.be/XT-OpqBLtO0
কার্বক্যাটায়ন ও কার্বানায়নের স্থিতিশীলতার সহজ ব্যাখ্যা || Stability Order of Carbocations
This video is very important to learn organic cemistry principle, attacking agent and their use, carbocation-carbanion and their stability. By using this con...
19/03/2022
https://youtu.be/GGeK-xDDXC8
Starch and Cellulose formation। স্টার্চ ও সেলুলোজ গঠন।পার্থক্য। প্রস্তুতি। বিক্রিয়া। A to Z
প্রিয় শিক্ষার্থী, ৯ম, ১০ম, ১১শ ও ১২শ শ্রেণির রসায়ন ও জীববিজ্ঞান বিষয়ের গুরুত্তপূর্ণ পার্ট স্টার্চ ও সেলুলোজ। এই ভি...