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Posted by on Saturday, October 12, 2013 at 9:28pm.

The rate constants for a reaction are found to be

k(-35 C) = 1.0 x 10-3 s-1

k(-25 C) = 2.0 x 10-3 s-1

At what temperature (in degrees C) will the rate constant be 3.79 x 10-3 s-1?

  • Chemistry - , Saturday, October 12, 2013 at 9:54pm

    Use the Arrhenius equation. Use k1 and k2 along with T1 and T2 and solve for Ea, the activation energy which isn't given. Then re-evaluate the same equation using Ea from the first calculation and k1 with T1 or k2 with T2 along with k3 and T3. Solve for T3.

  • Chemistry - , Saturday, October 12, 2013 at 10:41pm

    what is A then? the pre exponential factor?

  • Chemistry - , Saturday, October 12, 2013 at 11:06pm

    Does it matter? Whatever it is for k1 and k2 it should (must?) be the same for k3 so whatever you use for the first calculation to determine Ea you would use the same constant for the k3 calculation. I would use 1 to make it simple.

  • Chemistry - , Sunday, October 13, 2013 at 12:35am

    i am getting different values for both K1 and K2.
    i am using ln(k) = -Ea/(R*T) + ln(A)

    lnA = 0

    am i correct?

  • Chemistry - , Sunday, October 13, 2013 at 1:12am

    hey ss01 andDrBob222, what answers are you getting ?

  • Chemistry - , Sunday, October 13, 2013 at 1:17am

    @noodles i got q 1 ,2 5 , 9 , 10 &11
    what about you?

  • Chemistry - , Sunday, October 13, 2013 at 1:25am

    At what temperature (in degrees C) will the rate constant be 3.79 x 10-3 s-1?

  • Chemistry - , Sunday, October 13, 2013 at 1:27am

    @master of buttsecks i am also stuck at that problem?
    any other answers you got?

  • Chemistry - , Sunday, October 13, 2013 at 1:34am

    nope im stuck too

  • Chemistry - , Sunday, October 13, 2013 at 1:35am

    hello cn u help wid this pls ?
    1)Which substance ( Ar or F2 ) has the higher boiling point?


    Select the two most important reasons below to justify your choice should have the higher boiling point

    *Both substances are nonpolar but the higher boiling includes hydrogen bonding *Both substances are nonpolar but the higher boiling is more polarizable
    *The higher boiling substance is polar and the other is not
    *The lower boiling substance is polar and the other is not
    *The higher boiling substance has smaller vander Waals forces than the lower boiling
    *The higher boiling substance has greater vander Waals forces than the lower boiling
    *The higher boiling substance is ionic and the other is not
    *The lower boiling substance is ionic and the other is not
    *The higher boiling substance has hydrogen bonds and the other does not The lower boiling substance has hydrogen bonds and the other does not
    *Both substances are ionic but the higher boiling has a larger cohesive energy
    *Both substances are ionic but the lower boiling has a larger cohesive energy
    *The higher boiling substance is ionic and the other is not.
    *Ionic bonds are stronger than hydrogen bonds The lower boiling substance is ionic and the other is not.
    *Ionic bonds are weaker than hydrogen bonds
    *The higher boiling substance is ionic and the other is not.
    *Ionic bonds are stronger than vander Waals forces
    *The lower boiling substance is ionic and the other is not.
    *Ionic bonds are weaker than vander Waals forces

    2)Which substance ( HI or Xe ) has the higher boiling point?


    Select the single most important reason below to justify your choice should have the higher boiling point

    *Both substances are nonpolar but the higher boiling includes hydrogen bonding *Both substances are nonpolar but the higher boiling is more polarizable
    *The higher boiling substance is polar and the other is not
    *The lower boiling substance is polar and the other is not
    *The higher boiling substance has smaller vander Waals forces than the lower boiling
    *The higher boiling substance has greater vander Waals forces than the lower boiling
    *The higher boiling substance is ionic and the other is not
    *The lower boiling substance is ionic and the other is not
    *The higher boiling substance has hydrogen bonds and the other does not *The lower boiling substance has hydrogen bonds and the other does not *Both substances are ionic but the higher boiling has a larger cohesive energy
    *Both substances are ionic but the lower boiling has a larger cohesive energy
    *The higher boiling substance is ionic and the other is not.
    *Ionic bonds are stronger than hydrogen bonds
    *The lower boiling substance is ionic and the other is not.
    *Ionic bonds are weaker than hydrogen bonds
    *The higher boiling substance is ionic and the other is not.
    *Ionic bonds are stronger than vander Waals forces
    *The lower boiling substance is ionic and the other is not.
    *Ionic bonds are weaker than vander Waals forces

    3)Which substance ( HBr or HF ) has the higher boiling point?


    Select the single most important reason below to justify your choice should have the higher boiling point

    *Both substances are nonpolar but the higher boiling includes hydrogen bonding *Both substances are nonpolar but the higher boiling is more polarizable
    *The higher boiling substance is polar and the other is not
    *The lower boiling substance is polar and the other is not
    *The higher boiling substance has smaller vander Waals forces than the lower boiling
    *The higher boiling substance has greater vander Waals forces than the lower boiling
    *The higher boiling substance is ionic and the other is not
    *The lower boiling substance is ionic and the other is not
    *The higher boiling substance has hydrogen bonds and the other does not *The lower boiling substance has hydrogen bonds and the other does not *Both substances are ionic but the higher boiling has a larger cohesive energy
    *Both substances are ionic but the lower boiling has a larger cohesive energy
    *The higher boiling substance is ionic and the other is not.
    *Ionic bonds are stronger than hydrogen bonds
    *The lower boiling substance is ionic and the other is not.
    *Ionic bonds are weaker than hydrogen bonds
    *The higher boiling substance is ionic and the other is not.
    *Ionic bonds are stronger than vander Waals forces
    *The lower boiling substance is ionic and the other is not.
    *Ionic bonds are weaker than vander Waals forces

  • Chemistry - , Sunday, October 13, 2013 at 1:36am

    did you got q3 & 4

  • Chemistry - , Sunday, October 13, 2013 at 1:37am

    @ orangutan i got this one it is easy
    i need q3 and q4

  • Chemistry - , Sunday, October 13, 2013 at 1:40am

    no i dnt knw how to do it
    cn u help with my question

  • Chemistry - , Sunday, October 13, 2013 at 1:41am

    any other question you got?
    Ar
    HI
    HF

  • Chemistry - , Sunday, October 13, 2013 at 1:43am

    i ws able to figure that part easily
    but what i need is the reasoning part( selecting the answer frm those options)

  • Chemistry - , Sunday, October 13, 2013 at 1:46am

    Hey guys! are you from 3.091x ?
    I wasn't aware that there was a exam, and now it is due in few hours. Can you help me out? Much appreciated.

    1)Determine the minimum potential that must be applied to a proton so that, on interaction with a hydrogen atom, it can excite the ground state electron to a state of n=2

    and

    2)Electron exhibiting a particle wavelength of 3.77 x 10-9 are emitted from hydrogen atoms after interaction with high energy photons. Assuming that the electrons in the hydrogen atom were in their ground state prior to interaction, determine the wavelength of the photon which generated the free electrons

  • Chemistry - , Sunday, October 13, 2013 at 2:19am

    for 3rd
    The higher boiling substance has hydrogen bonds and the other does not
    for 2d 3 optin
    please tell any other ans you got?

  • Chemistry - , Sunday, October 13, 2013 at 2:43pm

    -13

  • Chemistry - , Sunday, October 13, 2013 at 5:36pm

    it's exactly -13 deg C ?

  • Chemistry - , Sunday, October 13, 2013 at 5:51pm

    -15 good answer

  • Chemistry - , Sunday, October 13, 2013 at 5:51pm

    checked

  • Chemistry - , Monday, October 14, 2013 at 12:51am

    Electron exhibiting a particle wavelength of 7.18 x 10-9 are emitted from hydrogen atoms after interaction with high energy photons. Assuming that the electrons in the hydrogen atom were in their ground state prior to interaction, determine the wavelength of the photon which generated the free electrons

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