Educational psychology is the branch of psychology concerned with the scientific study of human learning. The study of learning processes from both cognitive and behavioral perspectives allows researchers to understand individual differences in intelligence, cognitive development, affect, motivation, self-regulation, and self-concept, as well as their role in learning. The field of educational psychology relies heavily on quantitative methods, including testing and measurement, to enhance educational activities related to instructional design, classroom management, and assessment, which serve to facilitate learning processes in various educational settings across the lifespan. Educational psychology can in part be understood through its relationship with other disciplines. It is informed primarily by psychology, bearing a relationship to that discipline analogous to the relationship between medicine and biology. It is also informed by neuroscience. Educational psychology in turn i...

 Stoichiometry refers to the relationship between the quantities of reactants and products before, during, and following chemical  reactions. Stoichiometry was founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products, leading to the insight that the relations among qualities of reactants and products typically form a ratio of positive integers. This means that if the amounts of separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of the products can be empirically determined, then the amount of other reactants can also be calculated. This is illustrated in this example, where the balanced equation is:          CH4 + 2O4 -----> CO2 + 2H2O Here, one molecule of methane reacts with two molecules of oxygen gas to yield one molecule of carbon dioxide and two molecules of water. This particular chemical...