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In this research; aim was determining student achievement by comparing problem-based learning method with teacher-centered traditional method of teaching 10th grade chemistry lesson mixtures topic. Pretest-posttest control group research design is implemented. Research sample includes; two classes of (total of 48 students) an Anatolian High School student in 2014-2015 academic year. Treatment took place for 16 hours. Experiment group treated with problem-based learning method, control group wasdoi:10.11114/jets.v4i12.1939 fatcat:zst6ttlb7vc6lpcnbotmmlxshy