摘要:

The relative rates of reaction of C12O, C13O, and C14O with oxygen have been measured. When the oxidation proceeds mainly on the walls of the containing vessel the relative rates for C13O and for C14O compared to C12O are respectively 0.985 and 0.959. When reaction proceeds mainly in the gas phase there is no isotope effect within experimental error.

ISSN:0008-4042    

DOI:10.1139/v54-117

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The polarization–time curves obtained in the presence of glutamic acid generally showed two distinct polarization levels, one corresponding to an induction period following an initial rapid increase of polarization from the standard surface value, and the other corresponding to a steady state period following a second rapid increase of polarization. The polarization at both levels increased with increase of glutamic acid concentration and decreased with increase of sulphuric acid concentration in the electrolyte. In general, the induction period increased, and eventually became irreproducible, with increased sulphuric acid and copper sulphate concentrations, decreased glutamic acid concentration, decreased current density, increased temperature, and addition of chloride. Addition of sufficient chloride prolonged the induction period indefinitely at a polarization level corresponding to the presence of chloride alone. Following the induction period, the concentration polarization increased with glutamic acid concentration and was considerably higher than the value obtained during the induction period. Addition of chloride decreased the concentration polarization.

ISSN:0008-4042    

DOI:10.1139/v54-118

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The product obtained from the condensation of 5-hydroxy-2-methylbenzoic acid with aqueous formaldehyde and hydrochloric acid is dependent on the temperature. If the condensation is carried out at room temperature 3-hydroxy-6-methylphthalide results. This substance can also be obtained by the demethylation of 3-methoxy-6-methylphthalide. If the condensation is carried out at the boiling point the lactone of 8-hydroxymethyl-1,3-benzodioxane-6-methyl-7-carboxylic acid results. Proof of the presence of them-dioxane and phthalide rings in this latter substance has been established by opening these rings in succession. In both cases this has led by a series of degradative steps to 4-methoxybenzene-1,2,3,5-tetracarboxylic acid. The structure of this acid has been confirmed by its synthesis in six unambiguous steps from mesitylene.

ISSN:0008-4042    

DOI:10.1139/v54-119

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The investigation of the use, as analytical precipitants, of a number of aromatic phenylhydroxylamines is described. In general they react similarly, increasing in selectivity with an increase in acidity of the oxime group. In acid solutions (1% or more) only vanadium, tin, titanium, and zirconium are precipitated. Their variation in reaction with copper and the nature of their reaction with tin are described. All compounds can act as oxidants or rėductants with an oxidation potential of approximately −1.2 volts

ISSN:0008-4042    

DOI:10.1139/v54-120

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

Commercial chlorine may contain small amounts of chlorinated organic impurities, some of which have been estimated by infrared absorption spectrophotometry. Liquid chlorine has no infrared absorption spectrum up to 1180 cm−1. This has enabled long path lengths to be used to increase the sensitivity to low concentrations of organic compounds. A 5 cm. tantalum-clad steel pressure cell fitted with calcium fluoride windows was used, and spectra were recorded on a single beam instrument fitted with a calcium fluoride prism. Using extinction coefficients, estimations were made to a few parts per million on impurities such as chloroform, methylene chloride, phosgene, and hexachlorobenzene. The method was checked by known additions to pure liquid chlorine. The estimation of moisture in liquid chlorine is discussed.

ISSN:0008-4042    

DOI:10.1139/v54-121

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

The quenching of the resonance radiation of potassium by hydrogen and deuterium has been studied over the temperature range 71 °C to 83 °C. The quenching cross sections at 76 °C were found to be 1.56 × 10−16 cm2and 1.10 × 10−16 cm2respectively.

ISSN:0008-4042    

DOI:10.1139/v54-122

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

Cupric acetate was found to react homogeneously with molecular hydrogen in aqueous solution according to the following equation:The paper describes a kinetic study of this reaction. Rates were determined at temperatures between 80 and 140 °C and hydrogen partial pressures between 6.8 and 34.0 atm. The reaction was found to be of second order, the rate being proportional to the concentrations of cupric acetate and molecular hydrogen. It was established that the rate was independent of the surface of the reaction vessel, the cuprous oxide product and of the concentrations of sodium acetate and acetic acid in the solution. The reaction has an activation energy of 24200 cal. per mole. The kinetic results are discussed and a mechanism is proposed. This appears to be one of the few known homogeneous reactions of molecular hydrogen in solution.

ISSN:0008-4042    

DOI:10.1139/v54-123

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

Whentert-butyl chloride reacts with either alcoholic silver nitrate or aqueous alcoholic sodium hydroxide the Cl35compound reacts faster than the Cl37compound. The ratio of the rates of reaction is

ISSN:0008-4042    

DOI:10.1139/v54-124

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v54-125

出版商:NRC Research Press    

年代:1954

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v54-126

出版商:NRC Research Press    

年代:1954

数据来源: NRC