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《考试说明》中要求:“对原子、分子、化学键等微观结构有一定的三维的想像能力”。这一要求在近几年的高考试题中都有所体现。在复习中要注意从微观结构到化学式或从化学式到微观结构这两个相反的思维过程,提高三维空间的想像能力。一、从微观结构到化学式在晶体结构中,每个微粒的特有位置决定了它在结构中所占的份额,而这份额之比便是我们通常写出的化学式中的微粒个数比。
“Exam Description” requires: “There is a certain amount of three-dimensional imagination of microscopic structures such as atoms, molecules, and chemical bonds.” This requirement is reflected in the high exam questions in recent years. During the review, we must pay attention to the two opposite thinking processes from the microscopic structure to the chemical formula or from the chemical formula to the microscopic structure, and improve the imagination ability of the three-dimensional space. First, from the microstructure to the chemical formula In the crystal structure, the unique position of each particle determines its share in the structure, and the ratio of this share is the ratio of the number of particles in the chemical formula we usually write.