Recent content by mjc123

  1. M

    Ice cube in water: entropy calculation (Calorimetry)

    The equation is wrong because it does not include the latent heat. This is included in the calculation, but that is wrong because all the ice must warm up to 0C (and all the water cool to 0C).
  2. M

    Collection of Lame Jokes

    Looking in the wrong place. It was obviously Feathers McGraw!
  3. M

    Collection of Lame Jokes

    (Maybe that's related to the way we pronounce Van Gogh?)
  4. M

    Collection of Lame Jokes

    In the UK we say BOGOF. Never heard the term BOGO.
  5. M

    Collection of Lame Jokes

    Sideshow Bob had a tattoo "Die, Bart, Die". This caused the parole board some concern until he explained it was German for "The Bart, The". This allayed their fears because, as one of them said, "No-one who speaks German can possibly be an evil monster."
  6. M

    Why does having 8 valence electrons make an element inert?

    You may find this interesting: https://www.chemicalforums.com/index.php?topic=77729.msg283639#msg283639
  7. M

    Collection of Lame Jokes

    When God created the animals, He said to them: "Go forth and multiply". But the adders complained: "We can't multiply, we're adders." So God built a table out of logs. He put the adders on the log table, and the adders multiplied.
  8. M

    How would you describe briefly your own mental modeling of chemistry?

    In the immortal words of Basil Fawlty: "A satisfied customer! We should have him stuffed!"
  9. M

    How would you describe briefly your own mental modeling of chemistry?

    Maybe a bit of an over-simplification, but: Chemistry is about the manipulation of electrons. A chemical transformation involves changing the bonding arrangement of atoms to each other by changing the arrangement of the electrons around and between the atoms, e.g. by ionisation or the formation...
  10. M

    Reconcile poundforce w/slug and lbmass

    No it isn't. That contradicts the previous definition.
  11. M

    What is the Final Temperature When Mixing Water and Ice, Assuming All Ice Melts?

    Yes, exactly. The nonsensical result means that the assumption that all the ice melts is wrong. For a problem like this, the best way to start is by calculating 2 quantities: (i) The amount of heat released by lowering the temperature of all the water to 0oC; (ii) The amount of heat required to...
  12. M

    What is the Final Temperature When Mixing Water and Ice, Assuming All Ice Melts?

    No it doesn't; it gives a negative number. If cw >> L, then Tf = 100/7 = 14.28. So I suspect you used 4,184 instead of 4.184 for cw.
  13. M

    Collection of Lame Jokes

    Wagner's Ring in a nutshell.
  14. M

    B The focal length of the eye and image inversion

    I can coordinate the movements of the right hand, but not (or only with difficulty) the left. Is this common?