@article{repounp38072, title = {Effectiveness of Acid-base Modules Based on Guided Discovery Learning for Increasing Critical Thinking Skills and Learning Outcomes of Senior High School Student}, journal = {IOP Conf. Series: Journal of Physics: Conf}, year = {2019}, publisher = {IOP Conf. Series: Journal of Physics: Conf}, volume = {1185}, keywords = {acid-base moduls, critical thingking skills,learning outcomes}, url = {https://iopscience.iop.org/article/10.1088/1742-6596/1185/1/012151}, author = {Yerimadesi, Yerimadesi and Bayharti, Bayharti and Azizah, Azizah and Lufri, Lufri and Andromeda, Andromeda and Guspatni, Guspatni}, abstract = {The goal of this study was to reveal the level of effectiveness of acid-base modules based on Guided Discovery Learning (GDL) on Critical Thinking Skills (CTS) and student learning outcomes in chemistry learning at senior high school. Module effectiveness was determined through quasi-experimental research with a randomized control-group pretestposttest design. The sample consisted of 32 students as an experimental class and 35 students as a control class. The instrument used consisted of CTS test, pre-test and post-test. Student CTS test were analysed by percentage techniques and improvement of learning outcomes with NGain assisted SPSS software 25. The average CTS score of students found was 87.93\% with very effective categories. N-Gain experimental class was 0.8 (high) that was significantly higher than that of control 0.69 (moderate). Both classes were normally distributed and homogeneous, and the t-test obtained t count {\ensuremath{>}} t table . The research findings show that the use of acid-base modules based on GDL can improve CTS and student learning outcomes in chemistry learning at senior high school.} }