Question

suggest working models in chemistry​

Answer 1

Fire extinguisher

Volcano

Something like salt tests but to extract a byproduct from it

Those little grains that turns to artificial snow when you put water on them.

I would personally like to extract graphene once, I am very much fascinated with the idea. But no lab, no money, no guidence

Invisible ink

Extract raw soap from crude materials

Lactometer

Tea quality establisher

You can google many more ideas and watch some practically on youtube before you decide which one you want to work on. There are many fascinating ideas out there. Just think chemistry and that there are all lots and lots of chemicals and elements around you. Something may hit you to think of it, which you could also present practically in a short span on time.

Answer 2

extracting graphene from graphite by using tape or making pure carbon

mix sugar and h2o2 with sugar and heat the mixture at high temperature