Menu Icon Search
Close Search

About the ads

  1. If you prefer the SDN Blue style, go to the bottom left of the page and select "SDN Blue"

Entropy and Gibbs free energy

Discussion in 'MCAT Study Question Q&A' started by Hemichordate, 07.11.10.

  1. Hemichordate

    Hemichordate Pre-ophtho resident

    Joined:
    05.05.08
    Messages:
    1,074
    Status:
    Medical Student
    SDN 5+ Year Member

    SDN Members don't see this ad. (About Ads)
    If entropy dictates the direction of a reaction, do enthalpy and gibbs free energy dictates how fast the reaction proceeds in that direction?
  2. loveoforganic

    loveoforganic -Account Deactivated-

    Joined:
    01.30.09
    Messages:
    4,229
    SDN 2+ Year Member
    I think you're a bit confused, but I may just be misunderstanding what you're asking.

    Changes in entropy and enthalpy are the two factors (along with temperature) that give you your gibbs free energy change for a given reaction (the favorability of a reaction). This is generally referred to as the thermodynamics of a reaction.

    The rate of reaction is determined by the order of the reaction, the temperature, and the activation energy of the reaction. This is generally referred to as the kinetics of a reactions.

    There is not necessarily a relationship between favorability and rate.
  3. Hemichordate

    Hemichordate Pre-ophtho resident

    Joined:
    05.05.08
    Messages:
    1,074
    Status:
    Medical Student
    SDN 5+ Year Member
    I guess I'm just wondering if entropy is the sole factor that usually determines the direction of a reaction.
  4. RogueUnicorn

    RogueUnicorn rawr.

    Joined:
    07.15.09
    Messages:
    9,343
    Status:
    Medical Student
    SDN 5+ Year Member
    no gibbs free energy is.
  5. loveoforganic

    loveoforganic -Account Deactivated-

    Joined:
    01.30.09
    Messages:
    4,229
    SDN 2+ Year Member
    This. dG = dH - TdS

    Your dG value ultimately tells you the favorability of a reaction.

    dH, T, and dS are factors that tell you your dG value.

// Share //

Style: SDN Universal