After the conclusion of the chemica

After the conclusion of the chemical experiment, the experimental conclusion is drawn directly from the experimental phenomenon, and the data are not explained and described in detail in combination with the questions explored. In order to create problems in chemical experiments, we should pay attention to the close connection with human production and life, and develop the contents of students' interest into the contents of chemical experiments. Because students can find problems and have an urgent desire to solve situations they feel familiar with and find useful. Starting with experiments in daily life, students are guided to think and discover problems. In introducing the experimental exploration topic, it is necessary for students to put forward various hypotheses and speculations in combination with their own chemical knowledge and life experience, and design their own experimental scheme to verify the guess, and prepare the experimental materials according to the experimental scheme, in preparation for the experimental operation. For example, under the condition of material combustion, teachers should guide students to think about the condition of material combustion by linking it to the burning phenomenon in life. Through thinking and communication, most students in each group can suggest that it may be related to air, materials, and other factors. On this basis, students are required to design different experiments to verify conjecture.