Abstract
The study aimed to analyze the level of chemistry student's understanding of chemical concepts and critical thinking disposition that learn using problem based learning model. This research is a descriptive research. The subjects of the study were 35 students in the sixth semester of chemistry education program, University of Mataram, Indonesia. The student level of conceptual understanding data was obtained through three levels multiple choice tests, whereas the level of student critical thinking disposition data was collected by CTD questionnaire. The student level of conceptual understanding results showed that 58.57 % of students understood the concept well, 4.99 % understood the concept, 23.46 % were unsure and had misconceptions and 12.98 % had not understood the concept correctly. The analysis of the level of critical thinking disposition indicates that the student critical thinking disposition was categorized as positive. Correlation test indicated a significant correlation between conceptual understandings with critical thinking disposition. In conclusion, the level of conceptual understanding and the critical thinking disposition of students after learning using problem-based learning model were categorized as positive and both have a significant correlation.