Study On The Evaluation Mode Of "Video Recording,Late Scoring" In Junior Middle School Chemistry Experiment Operation

Investigating the chemistry experiment operation ability of 29 third-year junior high school students.And the evaluation of the chemistry experiment operation in junior high schools in China,it is found that experimental operation evaluation requirements are low at present,which cannot effectively promote the improvement of students’ experimental operation ability.The actual experimental skill level of third-year junior high school students does not meet the requirements of the curriculum standards,experimental results with the experimental operation ability is not consistent with the reality.Artificial invigilation field scale inefficiency,which leads to the experiment content cannot too complicated,scoring criteria can’t be too thin,limits the experimental operation evaluation connotation,in order to break through the problem,put forward the"video recording,scoring in the later new experiment operation evaluation mode,namely the examinee’s recorded the experimental operation process,the late rating according to the video.In order to study the feasibility of the evaluation model of "video recording and later scoring",the following studies were conducted on the basis of the test questions and scoring standards of "preparation of clarified limestone water"(experiment 1)and "iron wire burning in oxygen"(experiment 2):1.Compare the "video recording and later scoring" mode with the one-to-one invigilator on-site scoring mode and the effect in experiment 1;2.Experiment 1 and experiment 2 were used to study the feasibility of using"video recording and later scoring"mode to enable"double rating system".The study found that "video recording,post scoring" was close to the best effect of one-to-one invigilator field scoring,and with the increase of experimental complexity,the advantages of the new model were more obvious.In addition,the mode of "video recording and post scoring" can withstand the test of "double rating system",and the "double rating system" can be enabled to increase the fairness and impartiality of experimental operation test.The mode of "video recording and later scoring" requires a single examination room for examinees,and the simulation study on the arrangement of the examination room is found to be feasible.In addition,the standardized examination room and standardized process of "video recording and later scoring" evaluation mode were designed,and the design results were analyzed and commented.Finally,on the basis of summarizing the lack of research,a follow-up research plan is proposed,and the new evaluation mode is planned to be carried out in a small-scale pilotpractice to observe and evaluate the implementation effect..