Chapter 3 Stoichiometry Flashcard

stoichiometry
The relationships among the quantities of reactants and products involved in chemical reactions.
law of conservation of mass
A scientific law stating that the total mass of the products of a chemical reaction is the same as the total mass of the reactants, so that mass remains constant during the reaction.
chemical equation
A representation of a chemical reaction using the chemical formulas of the reactants 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 reaction; 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 compound 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 the burning of a match.
formula weight
The mass of the collection of atoms represented by a chemical formula.
molecular weight
The mass of collection of atoms represented by the chemical formula for a molecule.
mole
A collection of Avogadro’s number (6.022 ; 1023) of objects.
Avogadro’s number
The number of 12C atoms in exactly 12 g of 12C; it equals 6.022 × 1023.
molar mass
The mass of 1 mol 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 ratio of the actual (experimental) yield of a product to its theoretical (calculated) yield, multiplied by 100.

Get instant access to
all materials

Become a Member