Most popular questions and responses by lef
  1. science

    for the emission spectrum of Be3+, calculate the lowest wavenumber νˉ (in inverse meters) of light produced by electron transitions between n=2, n=3, and n=4.

    asked on November 16, 2012
  2. science

    At temperatures above 930 degrees Celsius, lead oxide (PbO) reduces lead sulfide (PbS) to form metallic lead (Pb) and sulfur dioxide (SO2). Write out the balanced chemical equation, using the smallest whole-number coefficients.

    asked on November 16, 2012
  3. science

    ICl2F+2: Calculate the maximum wavelength of electromagnetic radiation that is capable of breaking the weakest bond. Express your answer in meters. Bond energies (kJ/mol) are: I-I (150) F-F (160) Cl-Cl (240)

    asked on November 16, 2012
  4. science

    estimate the change in energy when solid rubidium reacts with gaseous diatomic chlorine molecules. Express your answer in units of kJ/mole

    asked on November 16, 2012