# Stoichiometry Flashcard

 stoichiometry
 the relationships among the quantities of reactions and products involved in chemical reactions
 chemical equation
 a representation of a chemical reaction using the chemical formulas of the reactants and products; a balanced chemical equation contains equal numbers of atoms of each element on both sides of the equation
 reactant
 a starting substance in a chemical reaction; it appears to the left of the arrow in a chemical equation
 product
 a substance produced in a chemical reactions; it appears to the right of the arrow in a chemical equation
 combination reaction
 a chemical reaction in which two or more substances combine to form a single product
 decomposition reaction
 a chemical reaction in which a single compounds reacts to give two or more products
 combustion reaction
 a chemical reaction that proceeds with evolution of heat and usually also a flame most combustion involves reaction with oxygen, as in burning of a match
 formula weight
 the mass of the collection of atoms represented by a chemical formula. for example, the formula weight of NO2 (46.0 amu) is the sum of the masses of one nitrogen atom and two oxygen atoms
 molecular weight
 the mass of the collections of atoms represent by the chemical formula for a molecule
 the number of 12C atoms in exactly 12 vg of 12C; it equals 6.022*10^23 mol-1
 mole
 a collection of Avogadro’s number (6.022*10^23) of objects; for example, a mole of H2O is 6.022*20^23 H2O molecules
 molar mass
 the mass of one mole of a substance in grams; it is numerically equal to the formula weight in atomic mass units
 limiting reactant
 (limiting reagent) the reactant present in the smallest stoichiometric quantity in a mixture of reactants the amount of product that can form is limited by the complete consumption of the limiting reactant
 theoretical yield
 the quantity of product that is calculated to form when all of the limiting reagent reacts
 percent yield
 the reaction of the actual (experimental)yield of a product to its theoretical (calculated) yield, multiplied by 100