Chem Academy

Cu এ-র সাথে লঘু নাইট্রিক এসিডের বিক্রিয়ায় কি কি উৎপন্ন হয়? কমেন্ট কর সবাই।

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 ...

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...

Inorganic reactions part -1: Chapter-3(Class-XI)

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.

Phase-transitions-melting-boiling-and-subliming
Class: VIII, IX & X-Chemistry

https://www.archemacademy.com/phase-transitions-melting-boiling-and-subliming/

Phosphoric acid(H3PO4) এ কতটি পানির অনু আছে?
উত্তরঃ ২ টি

মোলার দ্রবনঃ মোলারিটিঃ

https://www.archemacademy.com/%e0%a7%ab-%e0%a6%b8%e0%a6%be%e0%a6%b2%e0%a6%ab%e0%a6%bf%e0%a6%89%e0%a6%b0%e0%a6%bf%e0%a6%95-%e0%a6%8f%e0%a6%b8%e0%a6%bf%e0%a6%a1-%e0%a6%a6%e0%a7%8d%e0%a6%b0%e0%a6%ac%e0%a6%a8%e0%a7%87%e0%a6%b0/

Chemical Experiment at Faujdarhat Cadet College Laboratory

Solubility Definition/ দ্রাব্যতাঃ
Class: XI, XII & HSC:

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’.