Questions Asked on
December 24, 2007

  1. Chemistry

    Calculate the enthalpy change for the reaction 2C + H2 yield C2H2 given the following reactions and their respective enthalpy changes: C2H2 + 5/2 O2 yield 2CO + H2O -1299.6 C + O yield CO2 -393.5 H2 + 1/2 O2 yield H2O -285.9 I don't even know how to start

    asked by Lucy
  2. science

    how do parasites establish a physiological relatioship with its host

    asked by caleb
  3. Chemistry

    hi I'm having a serious problem with balancing chemical equations , can someone explain to me how we can do them also if i had a word equation hhow can i convert it into a symbolic equation and balance it e.g can someone show me how we do this equation:

    asked by Simon Lodge
  4. Chemistry

    Can someone check my answers for the following questions...btw HAPPY HOLIDAYS TO EVERY AT JISKHA! 1)As the magnitude of Keq increases, the amount of product formed in a reversible reaction: REMAINS CONSTANT 2)The Keq of reacion 4 x 10-7. At equilibrium:

    asked by Anonymous
  5. Chemistry

    hi I'm having a serious problem with balancing chemical equations , can someone explain to me how we can do them also if i had a word equation hhow can i convert it into a symbolic equation and balance it e.g can someone show me how we do this equation:

    asked by Simon Lodge
  6. Science(IX grade)

    What are the bond types present in Ammonia?

    asked by Rish Bhaya
  7. Chemistry

    How many joules are needed to heat 8.50 grams of ice from -10.0 degrees C to 25.0 degrees C?

    asked by Lucy
  8. Just Wondering

    Whats Christmas anyways? Like, how did it become a true holiday? What is the story behind it?

    asked by Ellen