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用化合价升降法配平氧化-还原反应方程式,在高中化学中既是一个教学重点,也是一个教学难点。其所以是教学重点,因为氧化-还原反应方程式的配平是正确书写氧化-还原反应方程式的一个重要步骤,是中学化学教学必须培养的一项基本技能,而通过这一内容的教学又可温故知新,加深对氧化-还原反应的概念、本质、特征等基础知识的理解,并使分散在初三到高二各年级的有关氧化-还原反应的教材形成一个完整的知识体系。其所以是教学难点,因为教学时必须引导学生搞清配平的原则步骤,熟悉书写格式,启发学生从各种不同类型
Using the valence reduction method to balance the oxidation-reduction equation is not only a teaching focus but also a teaching difficulty in high school chemistry. This is why teaching is important, because the balancing of the oxidation-reduction equation is an important step in correctly writing the oxidation-reduction equation and is a basic skill that must be cultivated in chemistry teaching in middle schools. Deepen the understanding of the basic knowledge of the concept, nature and characteristics of the oxidation-reduction reaction, and form a complete knowledge system on the textbooks related to oxidation-reduction reactions scattered throughout the third grade to the second grade of senior high school. It is therefore a difficult teaching point because teaching must guide students to find out the principle steps of balancing, familiar with the writing format, and inspire students to learn from various types.