The Effect of the Discovery Learning Model on Student Higher Order Thinking Skills on Buffer Solution Material

Higher order thinking skills are skills needed in studying chemistry. Student higher order thinking skills are currently still relatively low, so appropriate learning models are needed to overcome them. This research aimed at finding out the effect of Discovery Learning (DL) model toward student higher order thinking skills on Buffer Solution lesson. This research was conducted to the eleventh-grade students of Chemistry class at the second semester in the Academic Year of 2023/2024 at State Senior High School 2 Tambang. Quantitative method was used in this research with pretest-posttest non-equivalent control group design. The samples consisted of two classes selected by using cluster random sampling technique. The techniques of analyzing data were t-test to find out whether there was an effect of Discovery Learning model toward student higher order thinking skills and determination coefficient test to find out the effect. Based on the research findings, (1) t-test showed that the significant score 0.002 was lower than 0.05, it meant that there was a significant difference between experiment and control groups, the experiment group higher order thinking skills posttest mean was 80.21, and the control group was 72.64, so H0 was rejected and Ha was accepted; (2) determination coefficient test showed that the score of r2 was 0.130, so it could be concluded that DL learning model affected student higher order thinking skills on Buffer Solution lesson 13%.