Research On Teaching The Chemical Equilibrium Principle For Student Constructing The Means

Chemical balance principle is an important component of chemical basic concepts and chemical basic theory in middle school, and is also the key and difficult points of high school chemistry learning. Students think generally that understanding the Chemical balance principle is difficult. So, it is very good practical significance for lifting the teaching efficiency and resolving the difficult points that researching how to teach chemical equilibrium principle in middle school.In this paper, based on the review of "chemical equilibrium" knowledge study and the teaching design, the significance of constructivist teaching design as the theoretical basis of the principle of chemical equilibrium, knowledge and gives a comprehensive analysis of teaching and learning, on the basis of the construction of the meaning of "based on the chemical equilibrium principle" teaching design.In this experiment, two homogenous classes of students in NO.6 Middle School of Changde city as subjects, study the practice teaching the principle of chemical equilibrium. Teaching practice results show that the chemical balance, meaning construction of teaching can effectively improve the students’ learning achievement, and find out some teaching principles.(1) The meaning construction based teaching helps to promote the basic theory of chemistry learning.(2) Understanding of chemical equilibrium state changes from the perspective of concentration and velocity, more conducive to students understanding of the concept.(3) Moving from the aspect of kinematics understanding of chemical equilibrium, which is helpful for students to understand the concept.(4) The understanding of chemical equilibrium constants from the quantitative point of view, to promote students’ understanding of the concept.(5) Construction of the meaning of teaching design of chemical equilibrium principle can make the development level of students’ chemistry thinking ability with students’ cognitive development level, also in line with the development of the teaching content and learning.These conclusions are very good practicality in teaching the principle of chemical equilibrium. This paper puts forward the "chemical equilibrium" teaching suggestions based on the results of the study:1) limit problem by analyzing the changes of substance concentration in the reversible reaction and the rate of change of the reversible reaction, to learn the definition and characteristics of chemical equilibrium.2) make full use of experimental facts and data, which is established between the macro- micro- symbols for the connection of the three, mobile and Chiseller’s principle of chemical equilibrium positive learning.3) study the chemical equilibrium constant from the quantitative point of view, more conducive to the understanding of the significance of the chemical equilibrium constant.