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21 Cards in this Set
- Front
- Back
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the mass of the atom
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atomic mass
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the mass exactly equal to one-twelfth of the mass of one carbon atom
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atomic mass unit
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the amount of a substancce that contains as many elemetary emtities as there are atoms in exactly 12g of the carbon 12 isotope
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mole
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the mass of 2 mole of units
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molar mass
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the sum of the atomic masses in the molecue
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molecular mass
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the most direct and most accurate method for determining atomic and molecular masses
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mass spectrometer
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the percent by mass of each element in a compound
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percent composition by mass
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a process in which a substance is changed into one or more new substances
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chemical reaction
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uses chemical symbols to show what happens during a chemical reaction
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chemical equation
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the starting materials in a chemical reaction
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reactants
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the substance formed as a result of a chemical reaction
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product
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the uantitative study of reactants and products in a chemical reaction
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stoichiometry
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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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mole method
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in the proportions indicated by the balanced equation
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stoichiometric amounts
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the reactant used up first in a reaction
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limiting reagent
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the reactants present in quantities greater than necessary to react with the quanitity of the limiting reagent
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excess reagent
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the amount of product that would result if all the limiting ragent reacted
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theoretical yield
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the amount of product actually obtained from a reaction
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actual yield
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the proportion of the actual yield to the theoretical yield
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percent yield
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the actual number of atoms in 12g of carbon-12
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avogadro's number
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what are the reasons why actual yield is less than theoretical?
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1.Mechanical. sticks to glassware
2,Reaction not go to completion-some reactant remain unchanged 3.Evaporation of volatile chemical 4.Filtration-some solids pass through filter 5. Side or competing reactions 6.Human error |
