Flame speeds, halogen compounds

Flame Studies. The effects of ethylene dibromide, bromoform, and chloroform on flame speeds of several hydrocarbons were examined. These studies were carried out with 5% molar concentration of the halogen compounds in each hydrocarbon. All the experiments were carried out under identical conditions, and the results reported in Table I are the mean of at least three separate determinations. 

Table I. Effect of Halogen Compounds on Flame Speeds of Hydrocarbons...

When the vapour of alkali metals is mixed at low pressures, of the order 10 3mm., with certain halogen compounds, a cold, highly diluted flame is produced. A deposit of alkali halide is formed on the wall of the tube in which the reaction takes place, and from the distribution of this deposit and the velocity of the gas stream the partial pressures of the reacting substances and the reaction velocity can be inferred. A number of investigations with various modifications of this method have been carried out by Polanyi and others, J and a careful analysis and interpretation of the results has yielded much interesting and valuable information about the speed of the chemical reactions involved. 

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