基于真实情境的初中化学微项目教学实践与反思——以“溶液的形成”为例

Micro-Project Teaching Practice and Reflection on“Formation of Solution”in Junior High School Chemistry Based on Real Situations

以“溶液的形成”为例进行微项目教学实践,选择学生熟悉的护手霜为主题情境,巧妙设计了“原料分散”“微观探秘”“辨识活动”“对比实验”“感知乳化”等系列微项目活动,通过情境不断地设置认知冲突,引导学生反思、修正并最终形成更完善的概念,在环环相扣的探究活动中使学生自主建构结构化的知识。通过制作“护手霜”将“溶解”和“乳化”串联,感知溶液,感受乳化,感悟人与自然、社会的和谐、可持续发展。

The paper takes the“formation of solution”as an example for the micro-projects teaching,chooses the hand cream as the theme which is familiar to the students and design six micro-project activities:“the dispersion of raw material”“the exploration of micro perspective”“the discrimination of concept”“the improvement of concept”“the production of hand cream”“the perception of application”.The students are guided to reflect,revise and form a more complete concept finally by setting up cognitive conflicts through situations continuously,in this way,construct structured knowledge autonomously through these interlocking inquiry activities.The students can connect the dissolution with emulsification and feel the solution and emulsification and perceive the harmony and the sustainable development between humans,nature and the society by making the hand cream.