Abstract:This study developed a test instrument for mastering the concept of chemical representation on five natural acid-base indicators. This test aims to determine the mastery of macroscopic, submicroscopic and symbolic chemical concepts. Product trial data processed using the Rasch model assisted by Winstep software. The result showed that the instrument was valid as evidenced by a unidimensional test, person reliability was in good category, item reliability was in sufficient category, Cronbach alpha was in very g… Show more
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