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Very few chemical reactions are spontaneous decompositions of molecules, with first-order kinetics and equilibium as in the crabapple war. First-order kinetics are encountered more commonly in radiochemistry and the decay of atomic nuclei. Most chemical reactions occur when two or more molecules or ions collide, so the rates of reaction depend simultaneously on the concentrations of more than one substance. |
In
the hydrogen-iodine reaction, |
|
(g) + 
2HI (g)
