The level of submicroscopic representation can be cause of difficulty in learning chemistry, so that interest and understanding of chemistry concept is low. In overcoming this, innovative learning media are needed that are able to visualize and make it easier to understand abstract concepts, especially on the subtopic of the effect of reactant’s concentration and catalyst on the chemical rate reactions. This research aims to create product in the form of Augmented Reality assisted by Assemblr Edu that is valid, effective, and practical. This study is Research and Development that uses ADDIE development model and involves 10 prospective chemistry teacher students. Research instruments include validation sheets, test items, and response questionnaire. Data were analyzed using Aiken's V and descriptive statistic. The results showed that: (1) product have fulfilled very valid criteria with average percentage of 92% with aspect of product presentation and use are 92% (very valid), content aspect of 94% (very valid); language aspect by 92% (very valid); (2)average test score of respondents after using the product is 70 which indicates that product is classified as effective; and (3)average response to the product is 90% indicating that the product is very good and classified as very practical. The product is feasible to use and can support the mastery of technology-based concept, especially in the subtopic of the effect of reactant’s concentration and catalyst on chemical rate reactions.

The practicum management of chemistry teachers at senior high school on the topic of acid-base is quite good, although the majority are monotonous in testing acid-base properties using large amounts of solution. Some schools only limit the practical use of extracts from various flowers with certain color pigments, then tested on several samples and used as natural indicators, but have not paid attention to the number of reagents and estimated waste generated. The purpose of this activity is to improve the quality of classical practicum and the attractiveness of acid-base indicators from materials that refer to the principles of green chemistry. Service activities are carried out in training through the practicum method of making acid-base indicators using purple cabbage extract, sodium alginate, and 1% CaCl2 solution. This training provides a new and innovative description of the formation of purple cabbage extract gel as an acid-base indicator in the form of red balls under acidic conditions and green under alkaline conditions. Chemistry teachers were very happy and felt that this practicum was simple and interesting to be packaged and brought to the routine practicum conducted at schools.