Word Finder - peroxides

definition

A divalent radical or anion containing two oxygen atoms linked by a covalent bond; any substance containing this group which yields hydrogen peroxide when treated with an acid

definition

Hydrogen peroxide, especially an aqueous solution used as a bleach

definition

Any unstable compound or general formula R-O-O-R'

definition

To treat (something) with hydrogen peroxide, especially hair in order to bleach it

Oxygen, recognized by its power of igniting a glowing splinter, results from the decomposition of oxides of the noble metals, peroxides, chlorates, nitrates and other highly oxygenized salts.

Lead and manganese are partially separated as peroxides, but the remaining metals are not deposited from acid solutions.

Sodium percarbonates of the formulae Na 2 CO 4, Na2C206, Na 2 C05, NaHCO 4 (two isomers) are obtained by the action of gaseous or solid carbon dioxide on the peroxides Na 2 0 2, Na 2 0 3, NaHO 2 (two isomers)in the presence of water at a low temperature (R.Wolffenstein and E.Peltner, Ber., 1908, 41, pp. 275, 280).

The metal is soluble in solutions of chlorine, bromine, thiosulphates and cyanides; and also in solutions which generate chlorine, such as mixtures of hydrochloric acid with nitric acid, chromic acid, antimonious acid, peroxides and nitrates, and of nitric acid with a chloride.

Oxygen may be prepared by heating mercuric oxide; by strongly heating manganese dioxide and many other peroxides; by heating the oxides of precious metals; and by heating many oxy-acids and oxy-salts to high temperatures, for example, nitric acid, sulphuric acid, nitre, lead nitrate, zinc sulphate, potassium chlorate, &c. Potassium chlorate is generally used and the reaction is accelerated and carried out at a lower temperature by previously mixing the salt with about one-third of its weight of manganese dioxide, which acts as a catalytic agent.

This can be done most easily by " active " oxygen, such as is present in the peroxides, in chromic or permanganic acid.

They behave as unsaturated compounds, combining with oxygen to form peroxides and with the halogens to form triarylmethane halides.

Peroxides may in most cases be defined as oxides containing more oxygen than the typical oxide.

All peroxides have oxidizing properties.

Acidic peroxides combine with basic oxides to form "per" salts, and by loss of oxygen yield the acidic oxide typical of the element.

Why do some metals form peroxides on heating in oxygen?

When eaten by the animal, these PUFAs are converted into the toxic peroxides, the antagonists of vitamin E and selenium.

We only use vegetable based colorants and there are no peroxides or harsh chemicals present in these products and no synthetic preservatives or fragrances.

Both are involved in the removal of dangerous by-products, the former removing superoxide and the latter peroxides.

Referred to as oxidation, rancid fish oils lead to lipid peroxides, which "can (and do) start free radical cascades that can damage fatty cellular membranes," according to Dr. Eades.

It combines directly with chlorine to form sulphuryl chloride and also with many metallic peroxides, converting them into sulphates.

Peroxides may be basic or acidic. Some basic oxides yield hydrogen peroxide with acids, others yield oxygen (these also liberate chlorine from hydrochloric acid), and may combine with lower acidic oxides to form salts of the normal basic oxide with the higher acidic oxide.