School girl

Most popular questions and responses by School girl
  1. chimistry

    You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 100.0 ppm and is initially uniform through the thickness of the

    asked on December 14, 2012
  2. Chemistry

    what is the standard heat formation of F3O4. i know for F2O3 is -824.2. is this the same for F3O4????

    asked on December 3, 2009
  3. social studies

    who won the french and indian war?

    asked on May 6, 2008
  4. chimistry

    A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.82 kg m-3. Under these conditions the total surface area of the balloon is 0.39 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1.

    asked on December 14, 2012
  5. chemistry

    Chemical analysis of a silicon crystal reveals gallium at a level of 3.091*10^-7 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Si matrix is negligible, what is the density of free charge carriers (free

    asked on December 14, 2012
  6. chimistry

    Sulfur vapor is analyzed by photoelectron spectroscopy (PES). Measurements determine that photoelectrons associated with the 1st ionization energy of sulfur move with de Broglie wavelength λ=3.591 A˚. What is the maximum wavelength (in meters) of

    asked on November 18, 2012
  7. math

    tell how you did it thank you Write an equation using n and t. The total bill (t) was twenty times the number of people (n). t=20n t total bill was equals 20t 20 times number of people some purists will insist on writing it 20n = t either way is correct

    asked on April 25, 2007
  1. Math

    it is 5 feet because 10 divided by 2 is 5

    posted on October 15, 2019
  2. Language Arts

    yes I think those are correct 6. A 7.B 8.D

    posted on March 14, 2018
  3. chemistry

    I've got 5.05401530612e-07 but it's wrong :( Please help...

    posted on February 24, 2013
  4. chemistry

    I did it but it was wrong! :( Is the answer in meter?

    posted on February 24, 2013
  5. Chemistry

    What about 3.091*10^-7? please

    posted on December 15, 2012
  6. chemistry

    Sorry hina but it didn't work

    posted on December 15, 2012
  7. chemistry

    Any hint how to do it?

    posted on December 14, 2012