Chem 111 Chp 3

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maritacov
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53155
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Chem 111 Chp 3
Updated:
2010-12-03 18:52:30
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chemistry
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Chemistry 111 Chapter 3
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  1. by-product
    The substances formed by side reactions.
  2. competing reaction
    A reaction that reduces the yield of the main product by forming by-products
  3. empirical formula
    A chemical formula that uses the smallest whole-number subscripts to give the proportions by atoms of the different elements present
  4. excess reactant
    The reactant left over once the limiting reactant is used up.
  5. formula mass
    The sum of the atomic masses (in u) of all of the atoms represented in a chemical formula. Often used with units of g mol-1 to represent masses of ionic substances.
  6. limiting reactant
    The reactant that determines how much product can form when nonstoichiometric amounts of reactants are used.
  7. main reaction
    The desired reaction between the reactants as opposed to competing reactions that give by-products.
  8. Molar mass
    The mass of one mole of a substance; the mass in grams equal to the sum of the atomic masses of the atoms in a substance, with units of g mol-1
  9. molecular formula
    A chemical formula that gives the actual composition of one molecule.
  10. molecular mass
    The sum of the atomic masses (in u) of all of the atoms represented in a molecular chemical substance; also called the molecular weight. May be used with units of g mol-1.
  11. mole
    The SI unit for amount of substance; the formula mass in grams of an element or compound; an amount of a chemical substance that contains 6.022 × 1023 formula units.
  12. percentage composition
    A list of the percentages by weight of the elements in a compound.
  13. percentage yield
    The ratio (taken as a percent) of the mass of product obtained to the mass calculated from the reaction's stoichiometry.
  14. side reaction
    A reaction the occurs simultaneously with another reaction (the main reaction) in the same mixture to produce by-products
  15. theoretical yield
    The yield of a product calculated from the reaction's stoichiometry.

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