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用化学方程式来表示以黄铁矿和磷矿石为原料制造过磷酸钙的过程(1986年高考试题)。这道题实际上就出自硫酸的用途中的一句话“利用硫酸跟磷矿粉起反应可制得过磷酸钙等磷肥。”如果考生能熟悉硫酸的用途,就能迅速解出此题;但如果不知道硫酸的这一用途,就会摸不着头脑。物质的结构、性质、制备及用途这4者,有些教师往往只重视前3者,在上新课时,特别是上复习课时,对“物质的用途”一带而过,不予重视。实际上,这是不对
The chemical equation is used to express the process of making superphosphate from pyrite and phosphate ore (1986 Exam Questions). This question actually comes from a sentence in the use of sulfuric acid. “The use of sulfuric acid reacts with phosphate rock to produce phosphate fertilizers such as superphosphate.” If a candidate is familiar with the use of sulfuric acid, he can quickly solve the problem. But if you do not know this use of sulfuric acid, you will lose your head. In terms of the structure, nature, preparation, and use of the material, some teachers tend to focus only on the first three. When they attend a new class, especially during the review class, they are not aware of the use of “materials.” In fact, this is wrong