MolecularAR is an augmented reality-based application designed to aid in the teaching of chemical bonds. The application allows users to interact with representations of atoms and molecules in a virtual environment. The development process incorporated elements of participatory design and involved chemistry teachers during the application's design. The application was validated through two testing rounds with chemistry teachers and high school students, using different assessment instruments for each target audience. The application was well accepted by the academic community, and the use of augmented reality, when properly employed, is a relevant technology for assisting chemistry teaching. The application was developed using the Unity Engine, which supports 2D and 3D application creation and facilitates integration with augmented reality modules. The application features 3D animated models of atoms and chemical bonds, allowing users to interact with them in a virtual environment. Users can select atoms and bonds and project them into the environment using their smartphone camera. The application provides two types of representations: isolated atoms and bonds between atoms forming molecules. The application was validated through two rounds of testing with chemistry teachers and high school students. The teachers evaluated the application's usability using the System Usability Scale (SUS), while the students evaluated the application's attractiveness using the AttrakDiff tool. The results showed that the application was well accepted by both groups, with the teachers finding it useful and the students finding it engaging. However, some improvements were suggested, such as adjusting the size of atomic representations and modifying the way bonds are presented. The application is currently available for download on the Google Play Store and is in the process of being registered with the National Institute of Industrial Property (INPI). Future work includes additional testing with high school students and the development of a new feature called "Do It Yourself," which allows students to build molecules in the augmented reality environment. The application is expected to contribute to the learning process by providing an interactive and engaging way to study chemical bonds.MolecularAR is an augmented reality-based application designed to aid in the teaching of chemical bonds. The application allows users to interact with representations of atoms and molecules in a virtual environment. The development process incorporated elements of participatory design and involved chemistry teachers during the application's design. The application was validated through two testing rounds with chemistry teachers and high school students, using different assessment instruments for each target audience. The application was well accepted by the academic community, and the use of augmented reality, when properly employed, is a relevant technology for assisting chemistry teaching. The application was developed using the Unity Engine, which supports 2D and 3D application creation and facilitates integration with augmented reality modules. The application features 3D animated models of atoms and chemical bonds, allowing users to interact with them in a virtual environment. Users can select atoms and bonds and project them into the environment using their smartphone camera. The application provides two types of representations: isolated atoms and bonds between atoms forming molecules. The application was validated through two rounds of testing with chemistry teachers and high school students. The teachers evaluated the application's usability using the System Usability Scale (SUS), while the students evaluated the application's attractiveness using the AttrakDiff tool. The results showed that the application was well accepted by both groups, with the teachers finding it useful and the students finding it engaging. However, some improvements were suggested, such as adjusting the size of atomic representations and modifying the way bonds are presented. The application is currently available for download on the Google Play Store and is in the process of being registered with the National Institute of Industrial Property (INPI). Future work includes additional testing with high school students and the development of a new feature called "Do It Yourself," which allows students to build molecules in the augmented reality environment. The application is expected to contribute to the learning process by providing an interactive and engaging way to study chemical bonds.