chem final

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paza
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90400
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chem final
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2011-06-12 23:25:00
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  1. a pressure of 720 mm hg equals what in torr and pascals?
    • 720 torr
    • 95968.4 pa
  2. according to avagadro's law, 1L H2 and 1L O2 at the same temp and pressure have what in common?
    same # of molecules
  3. when solutions of 2 ionic compounds are combined and a solid forms, what it called?
    precipitate
  4. ions are formed from solute molecules by the action of the solvent in a process called what?
    ionization
  5. name some weak electrolytes
    HCl, CH3COOH
  6. electrolytes have a greater effect on freezing point depression than non-electrolytes because electrolytes
    product solutions are more
  7. as electrolyte concentration decreases, freezing-point depression
    increases
  8. name some binary acids
    HF, HCl, HBr
  9. binary acids begin with what?
    -hydro
  10. which acid is manufacture in the largest quantities?
    sulfuric
  11. which acid turns yellow on standing?
    nitric acid
  12. Arrhenius theorized that a base is a chemical compound that increases the concentration of _____ when dissolved in water
    OH-
  13. A species that remains when an acid has lost a proton is a
    conjugate base
  14. amphoteric compounds?
    HSO
  15. possible reactants in a neutralization reaction?
    OH-, H3O+, NaHCO3
  16. what symbol in a chemical equation indicates equilibrium?
    K
  17. If a soluble product forms, the reaction may run to completion if what things happen?
    gas bubbles, slightly ionized, precipitate
  18. adding a charged particle common to 2 solutes decreases solute concentration. what is this?
    common ion effect
  19. ion-product constant for water?
    10-14
  20. according to KMT, what makes particles move close to each other?
    kinetic energy
  21. what assumption of the KMT is not true for non-ideal (real) gasses?
    no forces between particles
  22. enthalpy of change is the
    energy absorbed as heat
  23. enthalpy of a solid is more or less than that of a liquid?
    less
  24. what is the symbol for entropy?
    S
  25. name substances with high entropy?
    gasses, steam
  26. symbol for free-energy change?
    G
  27. in (triangle)G calculations, temp is expressed in what?
    KJ/K
  28. most steps in a reaction mechanism are complex or not?
    not
  29. is energy released or absorbed?

    bond break

    bond form
    absorb

    release
  30. term with same numerical value for forward reaction and reverse?
    E
  31. how do products, reactants, and activation energy relate in an endothermic reaction
    activation > products > reactants
  32. changing a gas's pressure is another way of changing its
    concentration
  33. rate laws relate which 2 ideas?
    concentration of reactants and reaction rate
  34. the slowest step is the
    rate determining step
  35. compounds with uniform arrangement?
    homogeneuos
  36. heterogeneous mixtures contain how many substances and how are they distinguishable?
    2 or more, visibly different
  37. substances whose water solutions conduct electricity easily do what in water?
    ionize
  38. name a solvent for polar and nonpolar
    • polar - H20
    • nonpolar - nonionic something
  39. increasing temp favors dissolution when enthalpy of solution is
    positive
  40. expression that show PH of a solutoin?
    -Log(H30+)
  41. to calculate the pH of a substance whose [HO-] is known, you must 1st calculate
    pOH
  42. in acid-base titration, equivalent quantities of hydrominium ions and hydroxide ions are present at what point in the titration?
    endpoint

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