Oxidizable metals

The activation of persulfates by various reductant viz. metals, oxidizable metals, metal complexes, salts of various oxyacid of sulfur, hydroxylamine, hydrazine, thiol, polyhydric phenols, etc. has been reported [36-38]. Bertlett and Colman [39] investigated the effect of methanol on the decomposition of persulfates and proposed the following mechanism. 

When a reactive atmosphere is present [402,1249], the reaction undergone by a solid may be changed, and perhaps complicated, by the presence of a concurrent or consecutive gas—solid reaction. When one or more of the products of the reaction in vacuum is an oxidizable metal [60] or... 

Galvanize. To protect an easily oxidizable metal (such as iron) with a less oxidizable metal (such as tin or zinc) by electric means Ref Hackh s Diet (1944), 366-R... 

A vessel of bone-ash, formed for this purpose, is termed a cupel or test and in usbg such vessels Tot assaying, the absorptive power of the oupel is the only agency employed to separate the gold from the lead and other oxidizable metals, as will be explained afterwards. It is otherwise in cupellation on the large scale In this oass the oupel Is soon saturated, and the greater part of the litharge is expelled by a different method. 

More commonly the molecule is polarized by coordination ill such a manner that A bears a partial positive charge and B a partial negative charge in a complex A B M. Where M is a reducible or oxidizable metal ion, an electron-transfer process may result in which a free radical is generated from A B or its fragments and the metal assumes a different oxidation state. In any case the resulting species is often in a state in whidi it undergoes one. 01 more types of chemical reaction much more readily. 

Deissler patented in 1897 in Belgium primary compns contg as a base finely divided,easily oxidizable metals (such as Mg) mixed with a sulfide (such as Sb S ) and an oxidizing agent (such as KC103)... 

Anode, sacrificial — a rather easily oxidizable metal, e.g., zinc, magnesium, aluminum, electrically connected with a metal construction to be protected from corrosion. Due to the formation of a -> galvanic cell the sacrificial anode is oxidized instead of the metal to be protected. Sacrificial anodes are the oldest and simplest means for electrochemical corrosion protection. 

Chromic acid batteries - batteries in which chrom-ium(VI) (i.e., in acidic chromate solutions) is reduced on an inert electrode and the second electrode is made of an oxidizable metal. 

Only the two first methods allow measurement of the temperature coefficient of the surface energy. The maximum bubble pressure technique is well-adapted for metals with low and intermediate melting points and specially for oxidizable metals, while the sessile drop technique has been applied with success to measure ctlv values up to 1500°C. The drop weight method is particularly useful for very high melting-point metals because it avoids liquid contact with container materials. This is also true for the recently developed levitation drop technique that analyses the oscillation spectrum of a magnetically levitated droplet. 

Characterization of Metal Sites on Supported Metal Catalysts. Characterization of supported metals is usually more difficult. Considerable variation can frequently be found in the state of the reduced metal as a result of apparently minor differences in pretreatment, impurities in the support, or residual water or other contaminants. The problem is most severe with readily oxidizable metals. Ni (10), Mo (11), Re (12) and other metals can all show major variations depending on sample pretreatment and reduction procedures. Even in the case of platinum group metals many complications exist. The frequencies of bands observed when CO is adsorbed in a given manner (e.g. "linear" or "bridged") can shift by up to 100 cm 1 with coverage by CO or between different samples. 

Lone Pairs as Bronsted Bases Lone Pairs on Heteroatoms as Nucleophiles Softness, Solvation, Size, Basicity Easily Oxidizable Metals... 

Oxidizable metals, organometallics, and metal hydrides are usually very reactive. 

The oxygen is consumed by the fuel oil or a readily oxidizable metal such as aluminum or magnesium present to contribute further heat and power to the detonation process. Means to improve the normal handling of ammonium nitrate to decrease the explosion risk under ordinary shipping and storage conditions have been proposed [59]. 

Describe the process of corrosion. How can corrosion of an easily oxidizable metal be prevented if the metal must be exposed to the weather ... 

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