Learn English – The difference between “Chemistry students’ group” and “Chemistry student’s group”

"student's book" , a book that belongs to a student.

"student book" ,a book that is written for students and that group of

students can use it.

Prepositions are very difficult in every language that I know. Each construction with a preposition conveys a different nuance; but what nuance a particular preposition conveys is wholly unpredictable. It varies with every word.

For instance, we say

I am proud of my son.
I am ashamed of my son.
I feel pride in my son.
I feel shame for my son.
I am disappointed in my son.
I am fond of my son.
I am indifferent toward my son.
I am amused at my son.

Sometimes there are historical reasons for a particular usage, but only a tiny number of professional scholars know those reasons. People use a particular pronoun only because that is the pronoun which they hear and read and not for any logical reason.

So there is no way to teach the "nuance of of". A collocation, X of, expresses a particular nuance, but it has nothing to do with the nuance expressed by Y of. There is no shortcut: you just have to learn each individual expression.