Yield oxygen

The electrolytic decomposition of alumina yields oxygen which reacts with the carbon anode for an overall cell reaction ... 

A substance other than an organic peroxide which, although not itself necessarily combustible, may by yielding oxygen or by a similar process cause or contribute to the combustion of other material. 

Table 27-1. Energy yields, oxygen consumption, and carbon dioxide production in the oxidation of metabolic fuels.

Free radicals are by-products of prostaglandin metabolism and may even regulate the activity of the arachidonate pathway. Arachidonic acid, released from lipids as a result of activation of phospholipases by tissue injury or by hormones, may be metabolized by the prostaglandin or leu-kotriene pathways. The peroxidase-catalysed conversion of prostaglandin G2 to prostaglandin H2 (unstable prostanoids) and the mechanism of hydroperoxy fatty acid to the hydroxy fatty acid conversion both yield oxygen radicals, which can be detected by e.s.r. (Rice-Evans et al., 1991). 

Question 10 pertains to any material that readily yields oxygen or other oxidizing gas, or that readily reacts to promote or initiate combustion of combustible materials (NFPA 430 2000). Thus, most oxidizers can be thought of as being reactive with ordinary combustible liquids or solids, which are commonly used as process, packaging, general use, or structural materials. They can also react with many other substances. 

Any material that readily yields oxygen or other oxidizing gas, or that readily reacts to promote or initiate combustion of combustible materials. 

Barium peroxide was used in commercial production of oxygen in the past. Heating harium oxide in air at 500°C forms barium peroxide, which decomposes at 800°C to yield oxygen ... 

Substances which may not combust themselves, but by yielding oxygen, may contribute to the combustion of other materials. 

When carried out in the presence of molecular oxygen, PET reactions between some donor-acceptor pairs yield oxygenated products. The radical anions of acceptors with appropriate reduction potentials reduce O2 to superoxide ion, O2, which then couples to the cations. In the PET reaction between trani-stUbene and... 

Hydrogen peroxide decomposes in the presence of potassium iodide to yield oxygen and steam. If we add some detergent to the mix, a foam forms as the oxygen and steam emerge from the flask. It s neat. 

Thallium(I) oxide, T120, is a well-characterized compound and a useful source of Tl+ salts.1 Matrix isolation studies of the solid gave structural data in agreement with spectroscopic results.290,291 The so-called peroxide T102 is obtained electrochemically from aqueous T12S04, but the properties include insolubility in water, alkali and some dilute adds, and treatment with dilute HC1 yields oxygen. The stoichiometry suggests that the compound is in fact a superoxide, and this has been confirmed by spectroscopic studies on frozen matrices.292,293... 

As well as higher quantum yields, oxygen-dominant phosphors stand out because of their good temperature stability. For most substances the quantum yield only decreases noticeably above 250 °C. 

The most reliable technique for the analysis of superoxides is that developed by Seyb and Kleinberg. In this method the superoxide sample is treated with a mixture of glacial acetic acid and diethyl or dibutyl phthalate. The superoxide reacts with the acetic add to yield oxygen, hydrogen peroxide, and potassium acetate. The amount of superoxide in the sample is related to the amount of oxygen evolved which is measured with a gas buret. The stoichiometry of the analytical reaction is ... 

Hill found that cell-free suspensions of chloroplasts yield oxygen when illuminated in the presence of an electron acceptor. 

Of the above reactions, only (15) is consistent with the experimental observations. Calculations from collision theory based on the endother-micity of reaction (13) indicate that only one collision in about 104 could yield oxygen atoms. Since the quantum yield of ozone formation has been estimated at 0.03 (91) and as high as 0.14 (18), and since long chains are not possible, this reaction cannot be important. In reaction (14) one mercury atom is removed for each oxygen atom formed. Since 60 or more ozone molecules may be formed for each mercury atom removed, this reaction cannot be important unless mercury is regenerated. The postulated reaction (61)... 

Sufficient quantities of trichloromethyl radical are formed. Therefore, recombination and radical scavenging occur in parallel. Ozone can react directly with solute molecules and also decomposes in the gas phase to yield oxygen atoms and hydroxyl radical as follows ... 

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