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connected with chemistry 与化学有关的；化学的 changes in the chemical composition of the atmosphere 大气化学成分的变化
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produced by or using processes that involve changes to atoms or molecules 用化学方法制造的；化学作用的 chemical reactions/compounds 化学反应/化合物 chemical processes 化学过程
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using or connected with chemicals 与化学有关的；化学的 a chemical plant (= a factory producing chemicals) 化工厂 chemical agents (= substances) 化学药剂 the chemical industry 化学工业 a chemical attack 化学攻击 Chemical treatment with chlorine provides some protection against contamination. 用氯进行化学处理可以防止污染。
Word Originlate 16th cent.: from French chimique or modern Latin chimicus, chymicus, from medieval Latin alchymicus, from alchimia, from Arabic al-kīmiyā', from al ‘the’ + kīmiyā' (from Greek khēmia, khēmeia ‘art of transmuting metals’).