Study On The Development And Application Of Chemistry Teaching Cases In Middle School With Micro-lectures Integrated With Hand-held Technology Experiment

At present,there are more literatures about the study of micro-lectures in China.Most of the literatures focus on the flipped classroom,autonomous learning and teaching strategies and so on.The cases study of the combination of micro-lectures and hand-held technology and the application research in experimental teaching are rarely reported.Micro-lecture is a course unit or a short-term course which teaches and learns activities around a certain knowledge point(key point,difficult point,doubtful point)or teaching link in the process of teaching and learning.At present,video is the main carrier.Micro-lecture has the characteristics of prominent theme,specific content,short teaching time,simplified results,can spread variety,targeted,timely feedback.Hand-held technology experiment is a new digital experiment method which combines computer and microelectronics technology,which has the characteristics of portable,intuitive,real-time and quantitative.Applying the teaching mode of micro-lecture which blend in the hand-held technology experiment enriches the expressive form of teaching content and broadens the way of expression.It not only shows the teaching content well,but also gives the learners a more intuitive experience.It helps to arouse the enthusiasm of the students and enhance the autonomy of the students,so as to improve the efficiency of classroom teaching.It solves the problem that part experimental conditions are short and the experiments are not complete.Therefore,the micro-lecture which blend in the hand-held technology experiment teaching mode in middle school chemistry teaching will have a good application prospect.After consulting the literatures of micro-lecture and hand-held technology,we exploited the three cases on the basis of comprehensive application of relevant theories that are constructivism theory,ubiquitous learning theory and micro learning theory:Comparison of properties of sodium carbonate and sodium bicarbonate;The conversion of aluminum compounds to each other;The detection of iron elements in foods.The exploited teaching cases were applied in teaching practice.After the completion of teaching,through the questionnaire survey and interviews to teachers and observing the teaching practice in peacetime,the effect of case implementation is discussed.Finally,we make a reflection on the application of the teaching cases of the micro-lecture which blend in the hand-held technology experiment in classroom teaching.