<![CDATA[The aim of this study was to determine the effect of the problem-based learning model (PBL) on the learning outcomes of the fundamental laws of chemistry and magnitude of the effect size. This research was conducted at SMA Negeri 1 Buko using the experimental design method, namely the nonequivalent control group design. The population of this study consisted of class X IPA SMA Negeri 1 Buko students. The sample consisted of two classes which were selected using the random intact class technique with 25 people each. Data collection techniques using pretest and posttest. The test results of the hypothesis t test with a significant level of α = 0.05, the value of tcount = 24.8 is greater than ttable = 2.010. Therefore, H0 is rejected and H1 is accepted. This study concluded that there was an increase in learning outcomes between the PBL class and the conventional class with an effect size of 92.79%.]]>
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