Abstract Taking the production of toothpaste as the main thread, through four project tasks: understanding the oral environment, selecting toothpaste materials, measuring the content of main materials, and manually making toothpaste, this paper reviews the universality of acid and expands its personality. Understanding the laws of material transformation from the perspectives of element and transformation perspectives, reflects the general ideas of material research, and highlights the basic process of scientific exploration. The ideas to verify that reactions occur without obvious experimental phenomena is constructed. The methods of quantitative determination of the mixture, the ideas and principles of product design are summarized. The disciplinary concept that composition of substances determines the nature and the nature determines the usage are highlighted. The paper presents a case that using knowledge of chemistry to solve real-world problems and effectively cultivate students’ scientific attitude, social responsibility, questioning ability, critical ability, evidential reasoning ability and innovative awareness.
REN Xiao-Meng, FU Ai-Qin. Project Teaching of “Properties of Acids” in Junior High School Chemistry:Making Toothpaste[J]. Chinese Journal of Chemical Education, 2024, 45(5): 65-70.
