What is the chemical notation used to denote the change from reactants to products?

The notation that accurately signifies the transformation from reactants to products is represented as "Reactants → Products." However, the specific representation of a chemical reaction can take various forms depending on the context.

The correct answer reflects the general format, where the left side of the arrow represents the substances before the reaction (reactants), and the right side of the arrow represents the substances formed after the reaction (products). In this case, "X → Y" serves as a simple, abstract representation of this concept, indicating that a reactant X converts to a product Y.

The other options also denote the reaction process in different ways – such as showing multiple reactants leading to a single product or various combinations of reactants and products. But "X → Y" effectively demonstrates the essential concept of a chemical reaction, encapsulating the essence of the conversion process succinctly. This abstraction can be applied to a myriad of chemical reactions, aligning perfectly with the fundamental requirement of denoting the transition from reactants to products.