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Chemistry

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  • $\begingroup$ Hmm, UV can readily dissociate $\ce{Cl2}$, but I'm not really sure about hydrogen gas. It's known to be reacting vigorously, but only if some good amount of activation energy is provided. $\endgroup$
    – M.A.R.
    Commented Aug 16, 2015 at 15:27
  • $\begingroup$ interesting, activation energy in the form of radiation or kinetic agitation? $\endgroup$
    – wide_eyed_pupil
    Commented Aug 16, 2015 at 15:59
  • $\begingroup$ Activation energy can be kinetic or potential. Basically, you need the reacting species with correct orientation and enough energy to collide. See collision theory and The Arrhenius Law. $\endgroup$
    – M.A.R.
    Commented Aug 16, 2015 at 16:23