IPA: /ˈkɛmɪkli/
KK: /ˈkɛmɪkli/
In a way that relates to chemistry or involves chemical processes.
The substances were chemically altered to improve their effectiveness.
Chemically → It is formed from "chemic" (from Greek "khēmeia", meaning the art of transmuting metals) and the suffix "-ally" (meaning in a manner relating to). The word "chemically" refers to something that relates to or is done in the manner of chemistry.
Think of the art of transforming substances ('khēmeia') to remember that 'chemically' means relating to the processes of chemistry.