This study is to design a teaching strategy based on two "teaching experiments" that could facilitate chemistry-major students'conceptual understanding of electrochemistry.The study is based on two sections（experimental,n=56;control,n=58）of 114grade-X chemistry-major students from Shanxi Normal University,who were admitted in the year XX.Experimen-tal group participated in two teaching experiments designed to generate situations in which students are forced to grapple with alternative responses leading to cognitive contradictions.Re-sults obtained show that learning electrochemistry involves both algorithmic and conceptual prob-lems.On posttest 1,93% of the experimental group students responded correctly,in contrast to 39% of the control group.On posttest 2,39% of the experimental group responded correctly,in contrast to 0% of the control group.The difference in performance on both posttests is statis-tically significant (p<0.001) .It is concluded that the "teaching experiments" facilitated students'conceptual learning of electrochemistry.

A large body of research shown difficulties for students to establish macroscopic,microscopic,and symbolic representation and effective connections among them,which leads to students'a large number of misconceptions and learning disabilities in chemistry.To solve this problem,numerous scholars in west countries widely used computer models in chemistry teach-ing and achieved significant improvement.However,research in such field in China is pretty lag-ging behind.Based on empirical research,this paper summarized serial computer model-based teaching strategies in high school chemistry,and further discussed them with exampling related concrete teaching cases.These strategies include:using computer models to (a) create problem situations to inspire students thinking;(b）present the macro and micro phenomenon to help students understand scientific knowledge;(c）engage students in scientific methods and improve their inquiry ability;(d)guide students'questioning and reflection to deepen their understanding on the nature of science models;(e）construct model and enhance students'modeling skills.In the last part,we proposed some suggestions on computer model-based teaching in chemistry.

When ATDE teaching model is used in university chemical experimental course teaching,it not only facilitates the cultivation of students'autonomous learning and creative thinking ability,but also combines their interest with the learning of knowledge.Ideal teaching and educating effects can be achieved through the asking,thinking,doing and evaluation process of ATDE teaching model.The main contents of the ATDE teaching model and its merits com-pared with traditional teaching model are briefly introduced in this paper.Then some specific uti-lized strategies on how to apply ATDE teaching model in university chemical experimental course teaching are putted forward.

Recently,a 14-year ban on the manufacture and sale of disposable dinnerware made of plastic foam has been lifted by the National Development and Reform Commission（NDRC）of China.The news has sparked fierce debate in Chinese society.Plastic foam is also one of the most discussed topics in chemistry course,and therefore the lifting ban on plastic foam will apparently have an impact on chemistry teaching.In this paper,reasons on the lifting ban on disposable dinnerware made of plastic foam made by NDRC were explained based on its chemical production process,and some suggestions were also given for chemistry teaching.