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科学新知的学习和探究离不开科学实验,但是笔者认为教材里有些沿用多年的传统实验设计已跟不上知识更新的步伐,满足不了学生探究新知的需求。这就需要教师多动脑筋、多想办法,大胆地进行创新设计。下面就以“测定空气中氧气含量”的实验为例,初探传统实验设计的缺陷,对实验设计略做改进和创新,以期抛砖引玉。
The study and exploration of new knowledge of science can not be separated from scientific experiments, but the author believes that some traditional experimental designs that have been used for many years in teaching materials can not keep up with the pace of knowledge updating and can not satisfy students’ needs of exploring new knowledge. This requires teachers to use their brains, find ways to boldly carry out innovative design. The following “to determine the oxygen content in the air” experiment, for example, to explore the shortcomings of the traditional experimental design, the experimental design to make some improvements and innovations, with a view to start a discussion.