Analysis And Solution Tactics Of Forming Teaching Difficulties In Conception Group Of Substance Quantity

The amount of material substance "concept" group includes? the amount of substance, related molar mass,molar volume of gas,and the amount-of-substance concentration in the composition of such concepts as the concept of cluster system.lt not only includes the meaning of chemical quantity, but also refers to the amount of related substance,the number of particles and the relationship between the volume of gas,? gas molar volume calculation, concentration calculation, and "the amount of substance" which applied to the chemical calculation of the equation as well as the heat of reaction calculation and determination of formula and other rich content. Establishing completing "amount of substance" concept cluster system is good for Students thinking over chemistry problem by Using a combination of macro and micro ways of thinking, which makes chemistry close to students'life and play an important role on the entire secondary school chemistry learning.As a whole,the paper consists of five parts. The first, the " amount of substance" concept groups are set forth, combining with the aim and meaning of" amount of substance" under the new curriculum'theory. and analysis the significance results and lackness of domestic and foreign researches on it.On this basis,how to solve the difficulties in the teaching of amount of substance" concept group is envisaged.The second,it expounds the concept of group, including "the quantity of material, the concept of group composition, the various meanings of the concepts, the relations of concepts and other issues.The third section is the analysis of difficulties occuring in " amount of substance" concept group,A concrete analysis of the difficulties of the courses under the new curriculum, the analysis of textbook, the students' study condition and the teachers' teaching condition put forward the key difficult points and the cause which affect students to construct the concept group system of it. Part four, combining amount of substance" concept groups'the difficulties and the courses it puts forward solving strategy of difficulties on " amount of substance" concept groups.Part five is the thesis of the research findings and recommendations.