Baking powder or sodium bicarbonate (NaHCO3), is used in baking to make cakes rise because the carbon dioxide gas produced when baking powder reacts with water in the cake batter. Compare the volume of a cake prepared with the right amount of baking powder, with that of just about half the amount needed.

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".