The workshop provided a comprehensive overview of past and current activities of chemistry ontology projects, tools for ontology engineering and the application and curation of ontogologies in research data management. Recording Day 1 Part 1 of the 1st International Ontologies4Chem Workshopy organized by NFDI4Chem - the chemistry consortium in the NFDI. Details: https://doi.org/10.25798/frnp-sn04