Definition
A "chemical formula" is like a recipe for a molecule 🧪. It tells you exactly which elements are in a substance and how many atoms of each element there are. Think of it as the molecular equivalent of an ingredient list on a food package. For example, H₂O tells you that water has two hydrogen atoms and one oxygen atom. It's a shorthand way of representing the composition of a chemical compound. It's used by scientists to communicate information clearly and concisely. It's fundamental to understanding chemistry.