Abstract

This study aims to describe the effect of the professional competence of chemistry teachers on critical thinking skills of students of XI IPA SMA in Central Lombok in the academic year 2019/2020. This type of research is an ex-post facto quantitative study. This study was used  XI IPA of SMA Negeri 1 Praya Timur and SMA Negeri 1 Janapria as research subjects which are divided into 5 classes. Data collection on teacher’s professional competence and critical thinking skills of student was used a questionnaire consist of 13 statements. The data analysis technique used was simple regression analysis technique. The results showed that there was a positive and significant effect on the teacher's professional competence on critical thinking skills. This proved by the value of rcount = 0.72 greater than rtable = 0.158 and Fcount = 117.12 greater than Ftable = 3.91 at 5% error level. Based on the result, a number of 51% of teachers professional competence contibuted to critical thinking skills and the remaining 49% were influenced by other factors which doesn’t examined in this study.

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