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19 Cards in this Set
- Front
- Back
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atomic mass
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mass of the atom in atomic mass units
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atomic mass unit
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a mass exactly equal to one-twelfth the mass of one carbon-12 atom
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mole (mol)
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the amount of a substance that contains as many elementary entities (atoms, molecules, or other particles) as there are atoms in exactly 12g of the carbon-12 isotope
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Avagadro's number
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6.022*10^23
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molar mass
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the mass of 1 mole of units of a substance
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molecular mass
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the sum of the atomic masses (in amu) in the molecule
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percent composition by mass
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percent by mass of each element in a compound
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chemical reaction
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a process in which a substance (or substances) is changed into one or more new substances
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chemical equation
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uses chemical symbols to show what happens during a chemical reaction
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reactants
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starting materials in a chemical reaction
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product
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the substance formed as a result of a chemical reaction
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stoichiometry
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quantitative study of reactants and products in a chemical reaction
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mole method
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the stoichiometric coefficients in a chemical equation can be interpreted as the number of moles of each substance
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stoichiometric amounts
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in the proportions indicated by the balanced equaion
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limiting reagent
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the reactant used up first in a reaction
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excess reagents
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reactants present in quantities greater than necessary to react with the quantity of the limiting reagent
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theoretical yield
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the amount of product that would result if all the limiting reagent reacted
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actual yield
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the amount of product actually obtained from a reaction
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percent yield
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the proportion of the actual yield to the theoretical yield
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