世界各国的中学对化学的学习时间和要求虽有所不同,但把它作为一门必修课,这一点都是一致的。既然是必修,就说明一个受过教育的公民必须知道一些化学知识,否则,在他后来的工作及生活中,会感到被动,知识上有所缺陷。化学是研究物质及其变化的科学,人类每时每刻都要和物质打交道,试想,近代生活中,衣、食、住、行,发生了巨大的变革,其根本原因,就在于人类对物质世界有了更深入的了解,从而可以按我们的要求改变它,锤炼它,使物质按照要求为我们所用。近代的文明,正是建筑在对物质的征服上的。因此,作为一个公民—有知识的公民 Although the learning time and requirements for chemistry in secondary schools around the world are different, it is consistent that it is a required course. Since it is compulsory, it means that an educated citizen must know some chemical knowledge. Otherwise, in his later work and life, he will feel passive and have some defects in his knowledge. Chemistry is the science of studying matter and its changes. Humans must deal with matter at all times. Imagine that in modern life, clothing, food, housing, and transportation have undergone tremendous changes. The fundamental reason is that humans are The world has a deeper understanding, so that it can be changed according to our requirements, temper it, and make the substance usable as required. In modern civilization, architecture is the conquest of matter. Therefore, as a citizen - a knowledgeable citizen