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1.问:分子一定比原子大吗?答:这种说法比较片面.只能说分子与构成这种分子的原子相比,分子大,原子小。而对于不同类的原子、分子,就无法比较了。例如,汞原子的相对原子质量为201,而氢分子的相对分子质量为2,仅为汞原子的约1%。2.问:只含一种元素的物质一定是纯净物吗?答:这种说法是错误的。判断物质是否为纯净物的标准是看其是否由一种物质组成,并不是看是否由一种元素组成。同种
1. Q: Is the molecule necessarily larger than the atom? A: This is a rather partial statement. It can only be said that the molecule is larger and the atom is smaller than the atoms that make up this molecule. For different types of atoms and molecules, we cannot compare them. For example, the relative atomic mass of a mercury atom is 201, and the relative molecular mass of a hydrogen molecule is 2, which is only about 1% of mercury atoms. 2. Q: Is a substance containing only one element necessarily a pure substance? A: This statement is wrong. The criterion for judging whether a substance is pure is whether it consists of one substance, not whether it consists of one element. Same species