Stoichiometry Flashcard

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
a starting substance in a chemical reaction; it appears to the left of the arrow in a chemical equation
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
Avogadro’s number
the number of 12C atoms in exactly 12 vg of 12C; it equals 6.022*10^23 mol-1
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

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