The development of student worksheet based on predict observe explain to increase students' conceptual understanding of the reaction rates

The objective of this research is to develop student worksheet based on POE strategy on the topic of reaction rate. The sequence of research methodology was to assess the feasibility of worksheet and to find out the effectiveness of learning by using POE-oriented worksheet on students' conceptual understanding. The method used in this study was R&D and ADDIE development model with one group pretest-posttest design as its research design. The sample of the study was 30 students from XI science-3 class selected randomly selected.The data were collected from 20 multiple-choice items through pretest and posttest. The percentage of eligibility obtained from worksheet validator and chemistry teacher was 94.42% and 93.82% respectively showed POEoriented worksheet was highly feasible to use. The average score from pretest was 63.16, posttest was 85.16, and N-Gain was 0.59. The normality test for pretest showed that L_test = 0.150, while posttest L_test = 0.125. It can be concluded that the data to be normally distributed and the t-test result was t_test > t_table, 11.417 > 1.697. Based on these results, it can be concluded that the use of POE-based worksheet in chemistry learning process effectively increases students' conceptual understanding.