how will u improve the sentence?

I am writing about the topic in chemistry
句子己很達意, 如要修改, 我認為:
I am writing a few paragraphs about the topic of chemistry.
1) 其中最主要的是要用 of chemistry 而非 in chemistry.
2) some 是一修飾詞 (some paragraph 一些段落). a few 是定義詞 (a few paragraphs 數段, 幾段)

你可以改成：I am writing an essay of chemistry.
意思即係：我想作一篇有關化學的文章。
正常係唔會用"some paragraph"，字面意思即係"寫幾段"，意思怪怪地。
"In chemistry"="在化學這科裹"，唔係咁啱。

I'm currently working on some paragraphs on the topic of chemistry.

I am writing some paragraphs (or an essay, rather) on/about (the) ____ (the topic within chemistry).