The SOLO Level Research Of Salts Hydrolysis Learning Quality Of The Senior High School Students

The hydrolysis of salts is an important component of ionic equilibrium in the solution for senior high school chemistry,which demands the concept of particles,conservation and equilibrium and the ability of microstructure characterization and symbolic representation.The hydrolysis of salts has been widely used in chemical production and daily life and has significant effect on life and production.So,the hydrolysis of salts plays an important role in the senior high school chemistry and deserves research significance.The current evaluation criterion of chemistry in college entrance examination emphasizes "ability to conception" but the traditional learning evaluation criterion emphasizes on the learning outcomes quantified by unified examination.This paper is based on the SOLO classification evaluation theory(proposed by Biggs in 1982)aimed for study quality assessment of students,as well as the sub-level structure theory of SOLO classification evaluation(proposed by Prosser in 1991 and Burneet in 1999)to determine the frame of the paper?The test paper for the research is made based on the research frame and the analysis of SOLO classification evaluation theory for hydrolysis of salts in chemistry entrance examination over the country of recent five years,and 162 students in experimental science class at the third grade in the county WuGang are chose as the research object of the pre-test?It is found from the analysis of the pre-test data that the decision procedure of SOLO level of hydrolysis of salts by the SOLO classification evaluation theory is relatively tedious and has low operability as well as low applicability for big sample research;So the simplified SOLO classification evaluation theory and the quantified SOLO classification based on the research are proposed.The correlation analysis of the research data based on two different evaluation theories shows that there is significant correlation between the two evaluation theories.The sample size is enlarged to 360 students in four experimental science classes and two ordinary science classes at the third grade in the county WuGang during the formal research.The research includes(1)the structure of SOLO level in the study of the hydrolysis of salts(2)the difference of the SOLO level of hydrolysis of salts between the real situation and the requirement of the college entrance examination;(3)advice for review based on the survey of the SOLO level.The results of the formal research shows that:(1)only 17%of the students can reach A-level of associative architecture in the study of hydrolysis of salts and completely meet the criterion of the college entrance examination;(2)37%of the students can reach intermediate level of associative architecture in the study of hydrolysis of salts and meet the criterion of the college entrance examination;(3)46%of the students lie on low level of associative architecture in the study of hydrolysis of salts and cannot meet the criterion of the college entrance examination.The efficient advice for the review of salts hydrolysis by the students themselves is proposed based on the research and the analysis of single question:(1)having networked knowledge and structured cognition;(2)having generalized content and thorough comprehension of the mechanism;(3)having diversified thought and comprehensive method;(4)having modularized exercise and systematized introspection.Meanwhile,the advice for the teaching of salts hydrolysis is also proposed based on the research results and curriculum standards published in 2007 for high school chemistry:(1)combination of online and offline and breakthrough of learning place(2)integrated design of each unit for deep learning;(3)activity carried out gradually for development of key competence;(4)clear expression of thinking way and methods for self-migration.There are lots of knowledge points and variant questions of hydrolysis of salts,so the students are advised to make the knowledge points a knowledge network and conform to the existing cognition;have thorough comprehension of the mechanism of hydrolysis of salts and make correlation with ionization of the weak electrolyte,acid-base neutralization titration and chemical equilibrium;try for multi-solution and smart-solution to develop divergent thinking and convergent thinking and the ability of comprehensive application of the knowledge points of hydrolysis of salts.