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化學方程式(英文:chemical equation)係化學上一種攞嚟表達一場化學反應嘅方法。一條化學方程式會用化學元素嘅符號嚟表示出嗰場化學反應入面有啲乜嘢元素郁咗,同埋點郁法[1],好似係以下呢場簡單嘅反應噉:
喺呢場反應入面,一粒氫()分子同一粒氟()分子首先各自折開變成兩粒氫原子同兩粒氟原子,而佢哋再結合形兩粒氟化氫()分子-氫同氟兩種唔同嘅物質變咗做一種新物質。化學方程式令到寫化學嘢嗰陣唔使吓吓都出嗮啲元素嘅全名而且又清楚。
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