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Some Gen Chem Questions

Discussion in 'DAT Discussions' started by smthngintheway, Aug 20, 2011.

  1. smthngintheway

    2+ Year Member

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    Hi everyone. I have a few questions I'm not so sure on and I was wondering if you guys could answer them.

    Do we or do we not need to know:
    Plank's Constant, h, (6.626 x 10^-34 JxS or, the other one, 4.15 x 10^-15 ev-s)
    Rydberg's Constant, RH, (2.18 x 10^-18 J/e-)
    C^2 (speed of lights squared)= 932 MeV/amu (This is for figuring out Binding E?)
    Thermal Expansion, Volume expansion
    Things like what work or internal E is equal to in Isobaric, Isovulumetric, adiabatic or isothermal conditions? (Like W=PdeltaV at Isobaric. W=Q in Isothermal etc.)
    En (Energy at N primary level)=-13.6ev/n^2
    Entropy, S=q/T
    E=hf or E=hc/lambda or E=-RH/n^2

    Also, another thing I'm worried about is getting confused when you plug in moles or molarity. Like, for instance, Ka (Acid dissociation constant)=[H+][A-]/[HA].... That's molarity right? But then in Kc (equilibrium constant), for let's say aA + bB --->cC + dD, Kc= ([C]^c x [D]^d) / ([A]^a x ^b) That's in moles?

    I'm taking my DATs this Wednesday and it's so overwhelming. I get frustrated way too easily whenever I don't get an answer right and even looking at something I don't understand gets my stomach all queasy. How do I survive this!?

    Mad thanks in advance.
     
    #1 smthngintheway, Aug 20, 2011
    Last edited: Aug 20, 2011
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  3. SN1

    SN1
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    Also, another thing I'm worried about is getting confused when you plug in moles or molarity. Like, for instance, Ka (Acid dissociation constant)=[H+][A-]/[HA].... That's molarity right? But then in Kc (equilibrium constant), for let's say aA + bB --->cC + dD, Kc= ([C]^c x [D]^d) / ([A]^a x ^b) That's in moles?


    Mad thanks in advance.[/QUOTE]

    You do everything in Molarity. [] indicates molar concentration measured in molarity.
     

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