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23 Cards in this Set

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Atomic Mass
the mass of the atom in atomic mass units (amu)
Atomic Mass Unit
a mass exactly equal to one twelfth the mass of one carbon-12 atom.
Mole
the amount of a substance that contains as many elementary entities (atoms, molecules, or other particles) as there are atoms in exactly 12 g (or 0.012 kg) of the carbon-12 atom isotope.
Avogadro's number
Equal to one mole.
Molar Mass
the mass of 1 mole of units (such as atoms or molecules) of a substance.
Molecular Mass
sum of the atomic masses (in amu) in the molecule.
Percent Composition by mass
percent by mass of each elemnt in a compound.
Chemical Reaction
a process in which a substance (or substances) is changed into one or more new substances.
Chemical Equation
uses chemical symbols to show what happens during a chemical reaction.
Reactants
the starting materials in a chemical reaction.
Product
the substance formed as a result of a chemical reaction.
Stoichiometry
the quantitative study of reactants and products in a chemical reaction.
Mole Method
the stoichiometric coefficients in a chemical equation can be interpreted as the number of moles of each substance.
Stoichiometric Amounts
in the proporation indicated by the balance equation.
Limiting Reagent
the reactant used up first in a reaction.
Excess Reagents
reactants present in quantities greater than necessary to react with the quantity of th elimiting reagent.
Theoretical Yeild
the amount of product that would result if all the limiting reagent reacted.
Actual Yeild
the maount of product actually obtained from a reaction.
Percent Yeild
the proportion of the actualy Yeild to the theoretical yeild.
Excess Reagents
reactants present in quantities greater than necessary to react with the quantity of th elimiting reagent.
Theoretical Yeild
the amount of product that would result if all the limiting reagent reacted.
Actual Yeild
the maount of product actually obtained from a reaction.
Percent Yeild
the proportion of the actualy Yeild to the theoretical yeild.