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  1. S

    OMG Chemistry questions for final please help :(?

    1. Of the noble gases, __________ is present in highest concentration in dry air at sea level. (Points: 2) Ne He Xe Kr Ar 2. What is the partial pressure or oxygen (in torr) in the atmosphere when the atmospheric pressure is 760 torr? (Points: 2)...
  2. S

    decompostion equation chemistry please HELP! :(?

    In order to decompose excess hydrogen peroxide during my experiment, I heated the solution. The addition of the heat produced O2. How do I write the chemical equation that describes this decomposition? Help. :(
  3. S

    cation chemistry question. please HELP! :(?

    Suppose a solution contained only one cation: Cr 3+, Fe 3+, or Cu 2+. What would I have to do to identify the cation quickly?
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