Chemical

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late 16th century: from French chimique or modern Latin chimicus, chymicus, from medieval Latin alchymicus, from alchimia (see alchemy).

wiktionary

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chemic(“alchemy”) +‎  -al(“related to”)

etymonline

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chemical (adj.)

1570s, "relating to chemistry, pertaining to the phenomena with which chemistry deals," from chemic "of alchemy" (a worn-down derivative of Medieval Latin alchimicus; see alchemy) + -al (1). In early use also of alchemy. Related: Chemically. Chemical warfare is attested from 1917.

chemical (n.)

"a substance produced by a chemical process, a chemical agent," 1747, from chemical (adj.). Related: Chemicals.