化か学がく作さ用よう

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Meanings

1

noun

chemical action

Refers to the effect or process of a chemical reaction; used in scientific and technical contexts.

change, take the form of, influence

学study, learning, science

作make, production, prepare

用utilize, business, service

化か学がく反はん応のう
化学反応 specifically means 'chemical reaction', while 化学作用 is a broader term for any chemical effect or action.

Compound of 化学 (chemistry) and 作用 (action, effect).