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Chemical equilibrium is one of chemistry topics that sometimes reputed as difficult topic by the students. This study is a descriptive research which aimed to find out the difficulty of eleventh grader students to solve the chemical equilibrium questions. The sampels in this research were thirty two students in one class that choosed by simple randomize sampling. The data was collected by instrument which has 7 items in essay test and also questionnaire. The data was analyzed by descriptive statistic method to obtain percentage of the difficulty in each factors. There are four main factors have been analized: understanding the definition and basic concept of equilibrium, calculation of chemical equilibrium, predicting the direction of equilibrium, and basic supporting skills. Inside this main factors there are 12 indicators of difficulty. The result of this research showed that average percentage of difficulty of students to learning of chemical equilibrium categorized as low category. Through these 12 indicators, the most influence factor to the difficulties of chemical equilibrium is determine of dissociation degree and equilibrium constant. It is suggested that instructions and topics which students will learn should be focusing on dissociation degree and equilibrium constant matter
Muhammad Arsyad (Mon,) studied this question.