Chem Powerpoint Q's

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Author:
seniorcompany18
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158029
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Chem Powerpoint Q's
Updated:
2012-06-10 10:39:21
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CHEM FINAL
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Final 1!!!
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  1. not an indication of a chemical reaction
    change in total mass
  2. a solid produced in a reaction that separates from a solution
    precipitate
  3. in an equation, hydrogen gas would be represented by
    H2
  4. to balance an equation it may be necessary to
    adjust coefficients
  5. in what type of rxn, do 2+ substances combine to form a new compound
    synthesis
  6. AX--> A + X
    decomposition
  7. binary compound decomposes
    2 elements produced
  8. sequence of steps in a rxn
    reaction mechanism
  9. to be effective, a collision requires
    • sufficient energy
    • a favorable orientation
  10. units of molar mass
    g/mol
  11. reactant controls the amount of product formed
    limiting reactant
  12. ratio of actual to theoretical yield x 100
    % yield
  13. max amount of product obtained in a rxn
    theoretical yield
  14. force held constant as SA decreases
    pressure increases
  15. std temp
    0° C
  16. the temperature of a fixed quantity & volume of gas changes
    pressure must also change
  17. principle: under similar pressures/temps = volumes of gases contain the same # of molecules
    Avogadro
  18. molarity, molality & mols of solute per liter of solution ALL
    express concentration
  19. ionizes almost completely in a solution to produce H30+ ions
    strong acid
  20. Bronsted Lowry Acid
    proton donor
  21. amphoteric substance reacts
    acid or base
  22. energy required to raise the temp of 1g of water by 1° C or 1K
    specific heat
  23. units to measure specific heat:
    • all: J/g° C
    • J/g K
    • cal/g ° C
  24. exothermic rxn
    H is always negative
  25. majority of spontaneous rxns in nature
    exothermic
  26. a reaction in which products can react to reform reactants
    reversible
  27. at equilibrium, both forward & reverse..
    continue
  28. Delta H =
    products minus reactants
  29. endothermic rxn, E at beg. of rxn is_____
    less than the total E at the end of the rxn
  30. colligative property depends on
    concentration of solute particles
  31. why are fp & bp depressions colligative property
    directly proportional
  32. acids react
    with bases to produce salt & water
  33. traditional definition of acids is based on the observation of
    Arrhenius
  34. a lewis acid
    electron pair acceptor
  35. energy required to form activated complex
    activation energy
  36. determining efficiency of a reaction
    % yield
  37. constant combardment of gas against a container
    pressure
  38. temperature of gas decreases, pressure stays the same
    V decreases
  39. sum of partial pressures = total pressure
    Dalton's
  40. std. molar volume of a gas dependent on size
    FALSE
  41. std pressure in a column of Hg is
    760 mm
  42. Tyndall effect differentiates between
    solutions & colloids
  43. patricles that don't settle out
    colloid
  44. ex of diffusion
    the aroma of a skunk
  45. stirring increases the rate of dissolution b/c:
    it brings fresh solvent into contact with the solute
  46. rate of dissolution & rate of crystallization are:
    equal at equilibrium
  47. How many moles of ions are produced by the dissociation of CAF2
    3 mols
  48. energy transferred b/w samples of matter b/c of different temps
    heat

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