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Popular General Chemistry Topics

Discussion in 'MCAT Discussions' started by drjene, Jul 21, 2011.

  1. drjene

    2+ Year Member

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    In ya'll opinion, what are the most popular general chemistry topics on the MCAT? Like a MUST know topic for the MCAT

    Thank you!
     
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  3. mejorization

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    deltaG=deltaH-TdeltaS
     
  4. neelyboy

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    MUST KNOW: Henderson Hasselbalch
    pH = pKa + log [base/acid] = pKa + log [A-/HA]

    if pH < pKa, then the species is more prevalent in the protonated state as there will be a higher concentration of acid (HA) to fit the HH equation

    if pH > pKa, then the species will be more prevalent in the deprotonated state as there will be a higher concentration of base (A-) to fit the HH equation

    pKa = -log Ka
    Ka = 10^-pKa

    pH = -log [H+]
    [H+] = 10^-pH


    For acids/bases:
    If it's a strong acid or base, pH = - log[HX]] or pOH = -log[MOH]

    If it's weak, pH = 1/2pKa - 1/2log[HA] is the best shortcut to calculate the pH of weak species (Thanks TBR!!!)

    For titrations:


    pH = pKa at the halfway point for weak species titrated by strong species
    and at the equivalence point (where moles acid = moles base) pH = (pKa + pH(of titrant))/ 2

    for strong species titrated by strong species, the pH is ALWAYS 7 at the equivalence point.
     
  5. salim271

    salim271 Patience is tough. :/
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    Probably some random questions could show up on molecular geometry. You should at least know the basic ones: linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral. You should know the derivatives for them at least up to tetrahedral (bent, trigonal pyramid, etc). Also remember the bond angles 180, 120, 109.5, etc, and when there are nonbonding orbitals the bond angles are always less than those numbers.

    Edit: I like this site http://intro.chem.okstate.edu/1314f00/lecture/chapter10/vsepr.html
     
  6. Temperature101

    Temperature101 Membership Revoked
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    Electrochemistry and sound seem to usually appear on the mcat.
     
  7. Donald Juan

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  8. EnergyDrink

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    All of them if you want to get above an 8...
     
  9. inquiry101

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    leave no stone unturned
     
  10. centrigeugle

    centrigeugle less qq, more pew pew
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    One thing I'll suggest:

    Grow comfortable using dimensional analysis as the ONLY way of solving a problem. Units really are that important.
     
  11. bambam02

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    LEO the lion says GER
     
  12. salim271

    salim271 Patience is tough. :/
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    This is the MCAT not Chem 101 :p
     
  13. CodeBlu

    CodeBlu Dream Weaver
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    this x 1000000000000000000 m/s^2
     
  14. Whatyousay

    Whatyousay A few loose screws
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    No one mentioned Le Chatlier's?

    Easy to learn, easy to apply, easy to test.
     

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