1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Spontaneous reactions

  1. Sep 17, 2009 #1
    1. The problem statement, all variables and given/known data

    Find whether the following is spontaneous. Forward= (process as written), backwards, both or none

    2. Relevant equations
    1. water & syrup mixed to give a flavoured drink
    2. Piece of paer at room temp react with O2 to give CO2 and H2O
    3. Bathtub water gets cold after you stay in too long
    4. Water freezes at 10C & 1 atm

    3. The attempt at a solution
    1. backwards b/c you have to stir it for water and syrup to mix
    2. none? I'm not sure about this one. I don't think paper can react to give water.
    3. Forward
    4. backwards - water doesn't freeze at 10C

    Can someone double check this for me, thanks in advance!
  2. jcsd
  3. Sep 18, 2009 #2


    User Avatar

    Staff: Mentor

    Not necesarilly - mixing goes on its own, albeit very slowly.

    Every compound containing carbon and hydrogen gives CO2 and H2O when it burns. Check what is paper made of. Again, oxidation without burning is a very slow process, but it goes on its own.

  4. Sep 18, 2009 #3


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    This is so easy an English major could answer it. Your question stated, "1. water & syrup mixed...". emphasis mine.

    The rest look OK.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Spontaneous reactions
  1. Reaction Spontaneity (Replies: 1)

  2. Spontaneous Reactions (Replies: 5)