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A study of the current high school chemistry experiments concern with quantities reduction
Horng Jhy Ming
Chen Yu Fen
Experimental teaching is the characteristics of science education and the core of science teaching. Chemistry is an experimental science, with experiments can allow students to understand the chemistry better, which can not only foster a scientific experimental skills, interest, and attitudes toward science ,but also to enhance students’ impression of learning. The most controversial point about Chemistry Experiment is the problem of pollution on the environment. In recent years, due to the emergence of sustainable chemistry, experimental course design should turn towards to low-pollution and waste reduction. In this study, five common activity manuals of high school chemistry experiments are collected, and then the content of their experimental design are analyzed in order to identify the need to amend and improve. Experiments will be operated for several times. During the experiment, any phenomena or problems encountered will propose to discussion and try to solve the problem. For those can be further reduction of some drugs by theory, there will be designed to reduce waste reduction until the experimental result can be consistent with the purpose of the original experiment. In this study, a total of 22 high school chemistry experiments were operated, in which drugs can be reduced in the amount of the experimental operation accounting for about a half. Experimental operations can be reduced include the "preparation and properties of nitrogen", "electrolysis of potassium iodide in aqueous solution", "chemical battery," "synthesis of nylon", "preparation and properties of hydrocarbons," "reaction rate - stopwatch reaction "," acid-base titration "," redox titration "," preparation and properties of iodine as well as halogen ion test, "" point decreasing of solution freezing point "," preparation of aspirin "and" the make and preparation of oxygen " .A total of 12 experiments on behalf of the design of experiments course still have a space for improvement. Findings and recommendations are as follows: First, sustainable chemistry will be integrated into the chemical material Second, to strengthen students’ ways toward the classification of experiment waste disposal Third, set up a special administrator of laboratory and enhance the knowledge of experimental management of teachers Fourth, to encourage research organizations and teachers to engage in the design of experimental reduction Fifth, the implementation of experimental teaching Sixth, recommend textbooks to simplify steps of some experiments Seventh, include micro-experiment teaching as a teaching demonstration Eighth, to strengthen the work of waste disposal and recycling
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