Development of Problem Based Learning Innovative Student Worksheets in Learning the Concept of Chemistry for Senior High School Students

The purpose of this study was to develop, to establish and to evaluate the Innovative Chemistry in Student Worksheet (LKS) in order to find out the differences in student learning outcome. The assessment component consisted of content feasibility of language, presentation and graphic. The population were all students of class X Dharma Pancasila Senior High School Medan. Sample was taken by random sampling as many as 2 classes. The testing have been conducted by giving pretest. The teacher used Innovative LKS as media in the experimental class and the existing chemistry LKS used in the control class. The two classes have been given posttest at the end of the course. Data differences in learning outcomes were analyzed by t test. The results achieved shown that the Innovative LKS have an average of 3.75 in content eligibility; 3.79 on language worthiness; 3.64 on the presentation feasibility; and on the financial feasibility of 3.40. The percentage increase in student learning outcomes in the experimental class was 74.18% while for the control class was 56.42%. Statistical test results based on the calculation of the hypothesis test tcount 6.761>ttable 1.670, so it can be concluded that the students chemistry learning outcomes with Innovative LKS on the material of reduction and oxidation reactions is better.