chemiallisen
Chemiallisen is not a standard Finnish term. The correct Finnish adjective meaning “chemical” is kemiallinen. The form kemiallisen is the genitive singular of kemiallinen and is used to indicate possession or relation to a chemical substance, for example in phrases like kemiallisen aineen koostumus or kemiallisen reaktion tuotteet.
In Finnish, adjectives decline to agree with the noun they modify. For kemiallinen, typical forms include nominative
Etymology: kemiallinen derives from kemia (chemistry) with the adjectival suffix -llinen, which forms words meaning “pertaining
Usage notes: When writing in Finnish, use kemiallinen and its correct inflected forms rather than a form