Chemistry is the study of substances, encompassing their properties, structure, and the changes they undergo.
Chemistry is the study of matter, but I prefer to see it as the study of change. Electrons change their energy levels, molecules change their bonds, elements combine and transform into compounds. That’s life: solution, dissolution, growth, decay, and transformation.
- Walter White
Chemical structures can be described in ASCII using a notation called SMILES. SMILES stands for Simplified Molecular Input Line Entry System. A lot of chemistry databases and datasets use this format.
One of the most comprehensive online data sources is PubChem by the US government.