Chemistry Vocabulary Chapter 3

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Chemistry Vocabulary Chapter 3
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2013-08-30 19:28:25
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Chemistry Vocabulary Chapter
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Chemistry Vocabulary Chapter 3
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  1. n x molar mass of element
     ------------------------------- x 100% =
    molar mass of compound
    Percent composition of an element in a compound
  2. Actual yield 
    ------------------ x 100%
    theoretical yield
    % yield
  3. The amount of product actually obtained in a reaction.
    Actual yield
  4. The mass of an atom in atomic mass units.
    Atomic mass
  5. A mass exactly equal to 1/12th the mass of one carbon-12 atom.
    Atomic mass unit (amu)
  6. 6.022 x 1023; the number of particles in a mole.
    Avogadro's number (NA)
  7. An equation that uses chemical symbols to show what happens during a chemical reaction.
    Chemical equation
  8. A process in which a substance (or substances) is changed into one or more new substances.
    Chemical reaction
  9. One or more reactants present in quantities greater than necessary to react with the quantity of the limiting reagent.
    Excess reagents
  10. The reactant used up first in a reaction.
    Limiting reagent
  11. The mass (in grams or kilograms) of one mole of atoms, molecules, or other particles.
    Molar mass
  12. The amount of substance that contains as many elementary entities (atoms, molecules, or other particles) as there are atoms in exactly 12 grams (or 0.012 kilograms) of the carbon-12 isotope.
    Mole (mol)
  13. An approach for determining the amount of product formed in a reaction.
    Mole method
  14. The sum of the atomic masses (in amu) present in the molecule.
    Molecular mass
  15. The percent by mass of each element in a compound.
    Percent composition by mass
  16. The ratio of actual yield to theoretical yield, multiplied by 100 percent.
    Percent yield
  17. The substance formed as a result of a chemical reaction.
    Product
  18. The starting substances in a chemical reaction.
    Reactants
  19. The exact molar amounts of reactants and products that appear in the balanced chemical equation.
    Stoichiometric amounts
  20. The quantitative study of reactants and products in a chemical reaction.
    Stoichiometry
  21. The amount of product predicted by the balanced equation when all of the limiting reagent has reacted.
    Theoretical yield

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