My sister, If you aren’t going to work then you can share your knowledge, you can teach other students who may work Muslim or non Muslim, this will give them better image of Muslims, can be good way of giving dawah.

I personally don’t know of an ayah about it but you can gain reward insha’Allah from studying chemistry – it depends what your intentions and aims are

as mentioned in the article, your intentions/aims that could bring you reward insha’Allah:

-intention: studying chemistry to please your parents

-intention: studying chemistry to be able to provide for your family (if you/will be the provider); aim: find halaal job to provide for family and you will be rewarded for that insha’Allah

-intention: contributing to society/humanity; aim: perhaps you want to make a scientific discovery or advancement… perhaps you want to work for a humanitarian organization

Many times in the Qu’ran we read that those who are successful are those who have emaan and amaal salih (righteous actions/works) – so you can use your degree for that purpose

all of the above can fall under the larger intention of pleasing Allah Subhanahu wa  Ta’ala