Stoichiometry is the branch of chemistry concerned with the calculations of chemical reactions based on the laws of conservation of mass and energy. The term 'stoichiometric' refers to a balanced chemical equation of reactants and products. Synonyms for stoichiometric include balanced, equimolar, proportional, and equivalent. These terms imply a state of chemical equilibrium where the amounts of reactants and products are in perfect balance. Other synonyms include stoichiometrical, stoicheiometric, and stoicheiochemical, which all refer to the study of stoichiometry. Understanding stoichiometry is critical in predicting the outcomes of chemical reactions and designing synthesis pathways for new materials.