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This research is a development (Research and Development) model, which aims to develop the student worksheet on the processing of waste plastics into fuel oil and biogas production based environments valid, effective, and practical for use in the subject of environmental chemistry. Students’ Worksheet development refers to Four-D model comprising the steps define, design, develop, and disseminate. The instrument in this study is based on the validity of instruments students’ worksheet, the students’ worksheet effectiveness instrument consists of instruments of learning outcomes and student activity observation sheet, as well as practicality students’ worksheet instrument. It consists of a questionnaire of perception of students and faculty. The tests showed that the students’ worksheet in the category valid. Students’ worksheet also entered into force based on learning outcomes data and observation of student activities, while based on data from questionnaires the perception of students and faculty, students’ worksheet otherwise practical for use. Keywords-development research; development model 4D; students’ worksheet

Development of Student Worksheet of Processing Plastic Waste into Biogas Based on Environmental Chemistry Lesson