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Rate of reactions

Discussion in 'DAT Discussions' started by Awuah29, Apr 28, 2007.

  1. Awuah29

    Awuah29 Christian predent
    7+ Year Member

    Oct 13, 2003
    Likes Received:
    The rate of most reactions tends to double with a 10-Celsius increase in temperature. This is thought to be due to

    a. decrease in the activation energy
    b. an increase in the activation energy
    c. an increase in the equilibrium constant
    d. an increase in the fraction of molecules possessing at least
    the activation energy
    e. a decrease in the fraction of molecules possessing
    at least activation energy.

    Does Kaplan cover this faction of molecules rate of reactions:confused:
    the answer here is D, why not A?
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  3. ElectraOnAzalea

    10+ Year Member

    Jan 26, 2007
    Likes Received:
    the only thing that changes the energy of activation are catalysts. heat just speeds up the molecules movements. so they can reach the require energy of activation.
  4. llopop

    2+ Year Member

    Apr 7, 2007
    Likes Received:
    Agreed with the previous post. A lot of people confuse the thermodynamics of the reaction with the kinetics of the reaction. Temperature changes the rate at which we can move along an energy hill but has nothing to do with the height of the hill (a thermodynamic function).

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