Research On The Application Of "Peer Evaluation" In The Concept Learning Of "ion Reaction" Content Unit In Senior Chemistry

As the cornerstone of learning the knowledge system of chemistry discipline,chemistry concept is the basic unit of chemical thinking and a powerful basis for solving chemical problems.The content unit of "ion reaction" is not only the key point of high school chemistry concept,but also the difficulty in students’ learning.The design and evaluation target in the chemistry classroom is clearly required by the Chemistry Curriculum Standard of New Ordinary High Schools(2017)",so that students can actively carry out self-evaluation and mutual evaluation activities.As a way of evaluation,peer mutual evaluation is widely used in writing teaching and MOOCs,and many scholars recognize its effectiveness and feasibility.However,peer mutual evaluation has not been popularized in the concept learning of chemistry discipline.Now foreign countries have started peer mutual evaluation in chemistry concept learning,and have seen the positive role of peer mutual evaluation.This study adopts the "peer mutual evaluation" experimental study in the study of high school chemistry concept.This study intends to solve the following questions: Can(1)adding peer mutual evaluation improve the interest and achievement of high school students in learning chemistry concept?(2)What attitudes do grade one students hold towards peer evaluation?(3)Is there any difference in students’ acceptance of teacher evaluation and peer evaluation?In this study,two parallel classes were established as experimental class and control class,and the peer mutual evaluation practice research was conducted.Practice research,experimental class students learn chemistry concept is in the traditional teacher evaluation mode using peer mutual evaluation method,and the control class only use traditional teacher evaluation method,through research before,after,test scores,two questionnaire data,interview,homework comparative analysis of peer mutual evaluation of the influence in high school chemistry concept learning.After a period of practical research,the research conclusions are as follows:1.Using peer evaluation in the content unit of chemical concept "ion reaction" can improve students’ interest and achievement;2.Students hold a positive attitude towards peer evaluation of peers;3.The acceptance method of peer evaluation is different from that of teacher evaluation.Most students tend to peer evaluation,but some students insist on teacher evaluation;4.Peer mutual evaluation has an obvious effect on memorizing,understanding and analysis.Through the analysis of experimental research results,peer mutual evaluation is feasible and effective in learning the concept of "ion reaction" content unit.The content unit of "ion reaction" has many and complicated characteristics and difficulties.Under a series of interactions that students can discuss,communicate,think and feedback with their peers,students can study more effectively,which can not only improve students ’interest and confidence in learning chemistry concepts,but also improve students’ performance.