明显的化学实验现象是学生获取化学知识的前提。在化学实验中,物质的化学性质应通过化学反应的外在实验现象表现出来。学生通过观察、分析实验现象,可以认识物质的性质及其变化规律,促进化学知识体系的建构。但是,并非所有的化学反应都会表现出明显的实验现象,这就需要教师对化学实验进行创新设计。 Obvious chemical experiment is a prerequisite for students to acquire chemical knowledge. In chemical experiments, the chemical properties of the material should be manifested by external experimental phenomena of chemical reactions. Through observation and analysis of experimental phenomena, students can understand the nature of matter and its changing rules and promote the construction of a chemical knowledge system. However, not all chemical reactions will show obvious experimental phenomena, which requires teachers to carry out innovative design of chemical experiments.