With the radioactivity produced in a silver foil as a detector of neutrons, the scattering of slow neutrons by the metals Fe, Cu, Pb, Sn and Hg has been investigated. Curves showing percentage scattering as a function of thickness are given, from which the relative cross section for scattering has been calculated.
250 and 315°. A comparison of the reaction rates in packed and unpacked vessels shows not only that the reaction is homogeneous but that it is of the chain type.The change in composition of the condensable reaction products with time of contact shows that the oxidation proceeds through the stages glyoxal-formaldehyde-formic acid. The gaseous products consist mainly of carbon monoxide, together with carbon dioxide and hydrogen. A study of the change in gas composition with contact time indicates that carbon monoxide originates mainly from the direct decomposition of glyoxal, and that carbon dioxide is due to oxidation or decomposition of formic acid, whereas the origin of the traces of hydrogen is at present uncertain.The velocity of reaction is proportional to the square of the acetylene concentration and is independent of the oxygen concentration.In packed vessels the homogeneous oxidation is almost entirely suppressed, and a heterogeneous oxidation of acetylene on the glass surface directly to carbon dioxide and water takes place. The rate is roughly proportional to the first power of the acetylene and oxygen concentrations.The mechanism of the reaction has been discussed. Wilmington, Delaware
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