化学是在原子和分子的水平上研究物质的组成、结构、性质以及变化规律的科学。化学是改变世界的重要武器,古代的造纸术、印刷术、火药以及金属的制备,现代的宇宙飞船、人造卫星等都与化学密不可分。我们的生活、生产也离不开化学,因此学生要学好化学。由于受到高考制度改革的影响,学校、家长和学生都不重视化学,学生学习化学的时间明显少了许多,但高考时化学学科不达到等级要求又不能被 Chemistry is the science of studying the composition, structure, properties, and laws of change at the level of atoms and molecules. Chemistry is an important weapon to change the world. Ancient papermaking, printing, gunpowder and metal preparation, modern spacecraft, and artificial satellites are all inextricably linked with chemistry. Our life and production are also inseparable from chemistry, so students must learn chemistry. Due to the reform of the college entrance examination system, schools, parents, and students do not attach importance to chemistry. The time for students to study chemistry is significantly less, but the chemical science at the college entrance examination does not meet the grade requirements and cannot be