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分子是保持物质化学性质的最小粒子,它在化学变化中是可以再分的.也可以讲个数.它们是用来描述物质的微观构成的,习惯上用“构成”来描述.例如,水是由水分子构成的(一个水分子是由两个氢原子和一个氧原子构成的;但不能说“一个水分子是由氢元素和氧元素组成的”)一、分子概念例1(2014年河南)下列各组物质中,都由分子构成的一组是()(A)金和金刚石(B)水和氨气(C)汞和氯化钠(D)干冰和硫酸铜解析:根据金属、大多数固态非金属单质、稀有气体单质等由原子构成,有些物质是由分子构成的,如水、氢气等,有些物质
Molecules are the smallest particles that hold the chemical properties of matter and are subdivided into chemical changes. It can also be said that they are used to describe the microscopic composition of matter and are conventionally described by “composition.” For example , Water is composed of water molecules (a water molecule is composed of two hydrogen atoms and an oxygen atom; but can not say "a water molecule is composed of hydrogen and oxygen elements (A) gold and diamond (B) water and ammonia (C) mercury and sodium chloride (D) dry ice and copper sulfate Analysis: According to the metal, most of the solid non-metallic elemental, rare gas and other elements from the atomic composition, some substances are molecules, such as water, hydrogen, etc., some substances