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Abstract

The purpose of this study is determine the effect of applying REACT-TPK model on students' concept understanding. Two groups of students which were compare had different prior knowledge. The REACT-TPK model is one of the number innovations in chemistry learning model thst was applied in order to improve students’ understanding of chemistry concepts. The model can make students construct concepts actively and also encourages student’s conceptual change from misconceptions to correct understanding. Students' prior knowledge scores were obtained from previous relevant topic test scores. Test instrument was in the form multiple choice questions with closed reason accompanied by CRI and multiple-choice questions with 84,37% content validity and reliability (r) 0.740 for multiple-choice questions with closed-reason and (r) 0.599 for multiple-choice question. Data analysis using two way ANOVA test. The results showed there were differences in concept understanding between experimental and control classes (Sig.2-tailed 0.037), concept understanding between high initial ability students and low initial ability were different (Sig.2-tailed 0.002), but no interaction between learning models with initial level ability toward understanding of students concepts (Sig.2-tailed 0.395).

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