[Nishka]

There is no grape involved, the process was created with rice and yeast. What would some physical and chemical changes be, or just some basic particle and molecular theory to better understand it?

I know how stuff like fermentation works, but I want to know if there's more to it than that, if you know what I mean.

[Borek]

What is the most abundant substance in rice grains?

What is the substance used by yeast?

How are these two related?

[Nishka]

Thanks, that will help a lot. Although I don't know much about rice or its substances, I at least know about yeast. Good starting point I guess.

[Arkcon]

Start by understanding the recipe, how is rice wine made?  List all the steps.  This is a biological process, so you will have to expect enzymatic biochemistry at work,which is not a trivial process to reduce to basic chemistry.

or just some basic particle and molecular theory to better understand it?

This statement here, basically means nothing, right?  Or can you elaborate on this theme intelligently?

[Nishka]

Idk, stuff like ionic bonds, compounds, elements involved, etc. Idk how to elaborate on it intelligently, sorry lol.