微视频在盐溶液酸碱性教学中的运用

Application of Micro-Video in Teaching of Acid-Base Property of Salt Solution

为帮助学生初步理解并感知盐溶液的酸碱性，设计并实践了一节融合现代信息技术的实验教学课。运用“Camtasia Studio”软件自制微视频作为“盐溶液酸碱性”教学课的导入，然后学生仿照推测2种盐溶液的酸碱性并设计实验进行验证；教师用ipad抓拍学生实验过程中的现象，择时利用iTools的“苹果录屏大师”技术通过电脑投影呈现、分析，引导教学深入。微视频的使用缩略了实验过程、提升了课堂效率，也便于学生的二次学习；抓拍和实时投影技术及时定格或放大实验现象，便于回顾细究实验或清晰呈现实验进程；学生通过设计和亲历实验，体会到实验方案选择的重要性，体验到科学探究的一般过程。

In order to help students to build a general knowledge of the acid-base property of salt solution, this paper designed an experimental lesson which contained some modern information technologies. First, a micro-video made by the software ＇Camtasia Studio＇ was shown in the class, then the students imitated to guess the acid-base property of these two solutions and design experiments to verify their guesses. During this period, the teacher took photos of the students doing experiments with an ipad and showed those pictures with the computer projection by Air- Player, an application from iTools at the appropriate time, so as to promote a further analysis. The use of micro-video shortened the experimentation, increased the classroom efficiency and was also convenient for students to review this lessorL Taking candid photographs and real-time projection helped to have a distinct review of the experiment by freeze-framing and magnifying the experimental phenomena Students could also realize the importance of solution selection and experience an ordinary process of scientific inquiry by designing and practicing the experiment on their own.