-Reflection on the teaching of "What happened to matter"?

Textbook analysis

"What has happened to matter" is the content of the second lesson of Unit 2 "Change of matter" in the sixth grade of Science (UNESCO Edition), the standard experimental textbook for compulsory education. ?

The changes of substances can be divided into physical changes and chemical changes according to whether new substances are produced or not. This unit mainly studies the chemical changes of substances, looking for the essence of chemical changes from the accompanying phenomena of chemical changes: producing new substances. What new substances are produced by chemical changes of substances, and how to judge new substances, which requires students to learn to find enough evidence as the basis for judging new substances. ?

"What happened to matter" allows students to make assumptions, find evidence, draw conclusions, study various chemical changes and summarize the main characteristics of chemical changes: new substances are produced. ?

From the students' understanding, students are not required to master the types of chemical changes and the specific new substances produced, but are required to infer whether new substances have been produced from various changes, and then look for all kinds of evidence to verify their assumptions, so as to improve their scientific inquiry ability. ?

There are two parts in this lesson, which are "mixing beans with sand"? "Fully heat the sugar with a burning candle"? . Two inquiry activities run through the whole teaching process, so that students can understand the concepts of physical change and chemical change from experiments, and judge the material changes in life according to the differences and connections between these two concepts. Encourage students to know and understand the material changes in life, lay a foundation for further study in the future, and feel that science is everywhere in life.