Validity and practicality of chemical equilibrium module based on structured inquiry with three levels representation for students grade XI of senior high school

Abstract

Chemical equilibrium is an important material for understanding acid base and solubility concept. Based literature and interviews, this material is still considered difficult by student. The learning process that has not presented material with three level representation and interconnects it. Students ability to interconnect the three levels of representation will help students have a good understanding, so that a complete mental model is formed. The aims to develop chemical equilibrium module based structured inquiry with three levels of representation in terms of validity and practicality. The method used Research and Development through the use of Plomp model. The instrument was questionnaire form that consist of validity and practicality sheet. The module was validated by 5 validators. Practicality module was tested by 2 chemistry teachers and 69 students from two of senior high school in Padang. Validity and practicality data were analysed by using the Kappa Cohen formula. The results show that the module had very high degree of both validity (k = 0.82) and practicality (k = 0.91 for teacher response and k = 0.88 for student response). So it can be concluded that the module developed has been valid and practical for use in chemical equilibrium learning.