Chemistry subject is often considered difficult by some students, it is one of the features to lead misunderstanding of chemistry concept. Material is a basic concept that needs to figure out especially to make easier the concept of classifying material. The data analyzed using descriptive quantitative approaches with test items. The resets displayed that most of the study got difficulties differentiating elements, compounds, and molecules. They still gained complaints to categorized molecular elements and elements, molecular compounds and compounds, and atoms and ions.