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Students need extensive practice to interpret and manipulate chemical structures through drawing and problem solving. The article presents Zosimos, an online chemistry educational tool that supports comprehensive structure drawing, enables teachers to create shareable quizzes, and provides immediate feedback. 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Biró  \nStructure Drawing at the Heart of Teaching Chemistry  \nÁgnes Peragovics* and Erika Biró  \nAbstract: Chemistry is all about structures. There are myriads of structural representations that are required for the students to become familiar with when learning chemistry. Structural formula, skeletal formula, Lewis and resonance structures, three-dimensional representations are just a few examples of the drawing styles that should be readily interpreted by a chemistry student. In order to gain the necessary knowledge to understand and manipulate chemical structures, students must extensively solve problems with structural illustrations and practice drawing chemical structures themselves. Here we present Zosimos, an online chemistry educational tool with comprehensive structure-drawing capabilities that allows chemistry teachers to create real chemistry quizzes, share them with their students and get immediate feedback on their learning progress. 5th grade students at Kantonsschule Zug have been learning chemistry with Zosimos since September 2019 and this article also shares insights on how to implement this learning tool in a real classroom setting.  \nKeywords: Chemistry education · Online learning · Organic chemistry · Structure drawing  \nÁgnes Peragovics graduated from the Budapest University of Technology and Economics as a chemical engineer. After finishing her graduate studies, she completed her PhD in the field of pharmaceutical research. She first joined ChemAxon in 2013 and worked as an Application Scientist on several products. She also worked asa Sessional Lecturer at the University of British Columbia in Vancouver where she taught physical chemistry to international students. Having experience from the teacher-side, she rejoined ChemAxon and the Zosimos team as an Application Scientist in 2019.  \nIn love with computer science, Erika Biró first got involved with chemistry computational science in 1998, after graduating with a software engineering and mathematics degree at Eötvös Loránd University, Budapest. As a research assistant for 5 years atICAMS, School of Chemistry, University of Leeds, she took part in the development of a system called SPROUT that can assist in several stages of the structure-based rational drug design process. In 2005 she joined ChemAxon and went on developing Marvin, the drawing and editor tool. ChemAxon decided two years ago to build a new platform to support chemistry education where, since then, she is an active contributor as a product manager.  \n1. Introduction  \nChemistry relies heavily on structural representations. Fig.  \n1 shows some example representations that are commonly used to depict chemical structures such as skeletal formulas, threedimensional structures, and Lewis structures. However, interpreting, manipulating, and switching between the numerous structural representations is a complicated task for many students. [1] To be able to predict the reactions and properties of molecules, students must practice chemistry little by little every week, and  \npractice solving molecular representation and reaction drawing problems.  \nFig. 1. Some examples of the different structural representations used in chemistry.  \nConsequently, any digital learning tool used to support chemistry teaching is desired to have chemistry drawing capabilities.[2,3] This functionality is essential for teachers to create meaningful chemistry exercises and also vital for the students to practice drawing chemical structures. This year has posed many challenges to educators worldwide because of the coronavirus global pandemic[4] and resulted in a growing need for a chemistry learning platform that enables the students to practice and write assessments from home, while still showing off their compound drawing and interpretation skills.[5]  \nHere we would like to introduce Zosimos, an online chemistry educational tool that allows chemis","cbCaisbTKts3KxG3","https://ap.wps.com/l/cbCaisbTKts3KxG3","pdf",610568,"English","# Introduction\n## Supporting Chemistry Education\n### Text Answer","[{\"question\":\"Why is structure drawing central to chemistry education?\",\"answer\":\"Chemistry relies on structural representations, and students must be able to interpret, manipulate, and switch between many forms. Regular practice with drawing and representation problems is needed to understand and solve chemistry tasks.\"},{\"question\":\"What is Zosimos and what capabilities does it provide?\",\"answer\":\"Zosimos is an online chemistry educational tool focused on structure drawing. It integrates chemical drawing support (Marvin JS) so teachers can create quizzes, share them with students, and deliver immediate feedback.\"},{\"question\":\"How is Zosimos used for classroom assessment and learning progress?\",\"answer\":\"Teachers create quiz exercises with drawing-capable structure inputs, and students practice in a quiz format to learn multiple structural representations. The system provides immediate feedback and supports learning from home, including assessments.\"}]","Structure Drawing at the Heart of Teaching Chemistry - Online tool introduction and classroom implementation | PDF"]