Problem-based learning tools oriented of green chemistry in reaction rate concept

Abstract

The aims of the study to produce and discover the quality of problem-based learning tools oriented to green chemistry in the reaction rate concept. Learning tools consists of the syllabus, lesson plan, student worksheet, modules, and test instruments. This research and development adapted Nieveens model which consisted of four stages: preliminary research, prototyping stage, summative evaluation, and reflection and documentation. The quality of the learning tools developed was measured through the analysis of validity and practicality. Product validity assessment used validation questionnaires distributed to experts, the data obtained were analyzed by using the content validity formula. Practicality used response questionnaires assessed by teachers and students, and the implementation of learning was analyzed by using a percentage of practicality. This study resulted in the average of content validity being 0,67 categorized valid. The practicality percentage of each aspect is 90,87%, 80,06%, and 80,56% categorized highly practical. The concluded that learning tools developed fulfills the criteria for developing quality products that are valid and practical.