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chem.i.cal5kem7I7k[ladj化学的The chemical industry produces such things as petrochemicals, drugs, paint and rubber.化学工业生产诸如石化产品、药品、涂料和橡胶之类的东西。The government has said that it will never use a nuclear bomb except against a chemical attack (=an attack using chemical weapons).政府声称除非为抵抗使用化学武器的进攻，否则决不使用核弹。Chemical engineering is the design and operation of machinery used in industrial chemical processes.化学工程A chemical equation is a symbolic representation of the changes which happen in a chemical reaction.化学方程式A chemical formula is the representation of a substance using the symbols of its elements.化学分子式H2O is the chemical formula for water. H2O是水的化学分子式。A chemical reaction is a process in which the atomic or MOLECULAR structure of a substance is changed.化学反应When potassium is added to water, a violent chemical reaction takes place.当钾加入水中时，发生强烈的化学反应。Chemical warfare is the use of poisonous gases and other harmful chemicals against enemy forces.化学战争Chemical weapons are substances such as poisonous gases, rather than explosives, which can be used to kill or injure people.化学武器Almost all countries say they want to ban the use of chemical weapons.几乎所有的国家都声称他们要禁止使用化学武器。
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