Hydrogen-peroxide Sentence Examples
When this compound is acted on by water, hydrogen peroxide and levulinic aldehyde are formed, the aldehyde being subsequently oxidized by the hydrogen peroxide, forming levulinic acid.
The first chemical change suggested is an interaction between carbon dioxide and water, under the influence of light acting through chlorophyll, which leads to the simultaneous formation of formaldehyde and hydrogen peroxide.
The formaldehyde at once undergoes a process of condensation oi- polymerization by the protoplasm of the plastid, while the hydrogen peroxide is said to be decomposed into water and free oxygen by another agency in the cell, of the nature of one of the enzymes of which we shall speak later.
Thus, i part by weight of hydrogen unites with 8 parts by weight of oxygen, forming water, and with 16 or 8 X 2 parts of oxygen, forming hydrogen peroxide.
By electrolysis it yields uranium dioxide as a pyrophoric powder, and peruranic hydroxide, U04.2H20, when treated with hydrogen peroxide.Advertisement
When shaken with potash and air it undergoes autoxidation, hydrogen peroxide being formed first, which converts the trioxide into the dioxide and possibly pertitanic acid.
A hydrated dioxide, approximating in composition to SrO 2.8H 2 O, is formed as a crystalline precipitate when hydrogen peroxide is added to an aqueous solution of strontium hydroxide.
It is also obtained by the action of hydrogen peroxide on hydrocyanic acid, or of manganese dioxide and sulphuric acid on potassium cyanide.
The action proceeds in two stages; in the first hydrogen peroxide and potassium aurocyanide are formed, and in the second the hydrogen peroxide oxidizes a further quantity of gold and potassium cyanide to aurocyanide, thus (1) 2Au+4KCN +02+2H20=2KAu(CN)2+4KOH+H202;(2)2Au+4KCN+2H202= 2KAu(CN) 2 +4KOH.
When dissolved in water it yields some NaOH and H202; on crystallizing a cold 'solution Na202.8H20 separates as large tabular hexagonal crystals, which on drying over sulphuric acid give Na 2 0 2.2H 2 0; the former is also obtained by precipitating a mixture of caustic soda and hydrogen peroxide solutions with alcohol.Advertisement
Chromic acid and its salts, the chromates and bichromates, can be detected by the violet coloration which they give on addition of hydrogen peroxide to their dilute acid solution, or by the fact that on distillation with concentrated sulphuric acid and an alkaline chloride, the red vapours of chromium oxychloride are produced.
Wolffenstein (Ber., 1894, 27, p. 2307) prepared practically anhydrous hydrogen peroxide (containing 99.1% H 2 0 2) by first removing all traces of dust, heavy metals and alkali from the commercial 3% solution.
It is found, more especially in the case of organic compounds, that if a substance which oxidizes readily at ordinary temperature be mixed with another which is not capable of such oxidation, then both are oxidized simultaneously, the amount of oxygen used being shared equally between them; or in some cases when the substance is spontaneously oxidized an equivalent amount of oxygen is converted into ozone or hydrogen peroxide.
The oxygen uniting with the substance undergoing oxidation is generally known as "bound oxygen," whilst that which is transformed into ozone or hydrogen peroxide is usually called "active oxygen."
Traube (loc. cit.), on the other hand, concludes that the oxygen molecule enters into action as a whole and that on the oxidation of metals, hydrogen peroxide and the oxide of the metal are the primary products of the reaction.Advertisement
Walden point out from the physico-chemical standpoint that in water and hydrogen peroxide the oxygen atom is probably quadrivalent.
Oxygen may be applied locally as a disinfectant to foul and diseased surfaces by the use of the peroxide of hydrogen, which readily parts with its oxygen; a solution of hydrogen peroxide therefore forms a valuable spray in diphtheria, tonsillitis, laryngeal tuberculosis and ozaena.
Internally hydrogen peroxide is used in various diseased conditions of the gastro-intestinal tract, such as dyspepsia, diarrhoea and enteric fever.
It completely decomposes hydrogen peroxide in sulphuric acid solution 2KMn04+5H202-I-3H2S04 = K2S04+2MnS04+8H20+502.
A higher hydrated oxide, CeO 3 xH 2 O, is formed by the interaction of cerous sulphate with sodium acetate and hydrogen peroxide (Lecoq de Boisbaudran, Comptes rendus, 1885, loo, p. 605).Advertisement
Copper dioxide, CuO 2 H 2 O, is obtained as a yellowish-brown powder, by treating cupric hydrate with hydrogen peroxide.
It is a grey coloured powder which is readily decomposed by dilute acids with the production of hydrogen peroxide.
It is certain that the formation of hydrogen peroxide and ozone accompany the glowing, and in 1848 Schonbein tried to demonstrate that it.
The solution is stable to oxidizing agents such as dilute hydrogen peroxide and chlorine, but is oxidized by potassium permanganate to phosphoric acid; it does not reduce salts of the heavy metals.
The first is formed when 30% hydrogen peroxide reacts with phosphorus pentoxide or metaor pyrophosphoric acids at low temperatures and the mixture diluted with ice-cold water.Advertisement
Perphosphoric acid is formed when pyrophosphoric acid is treated with a large excess of hydrogen peroxide.
The alkaloid is a strong base and is very readily oxidized; chromic acid converts it into normal butyric acid and ammonia; hydrogen peroxide gives aminopropylvalerylaldehyde, NH 2 CH(C 3 11 7) (CH2)3 CHO, whilst the benzoyl derivative is oxidized by potassium permanganate to benzoyl-a-aminovaleric acid, C 6 H 5 CO NH CH(C 3 H 7) (CH 2)3 COOH.
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.
Na 0 0 Na, Bab, which yield hydrogen peroxide with acids; and (2) the polyoxides, having the oxygen atoms doubly linked to the metallic atom, e.g.
This theory was controverted by Wyndham Dunstan, who attempted to prove that carbon dioxide was not necessary to rusting; and in place of the acid theory, he set up a scheme which involved the production of hydrogen peroxide.
By the addition of hydrogen peroxide to a solution of chromic acid, a fine blue coloration due to a perchromic acid is produced which is readily absorbed by shaking out with ether.
It is shown that the blue solution most probably contains the acid of composition, H2Cr203, whilst in the presence of an excess of hydrogen peroxide more highly oxidized products probably exist.
The pharmacological action of hydrogen peroxide (H202), potassium permanganate, powdered charcoal and some other oxidizing agents depends on the readiness with which they give up oxygen.
Peroxisomes - derived from rough eroxisomes - derived from rough ER, that contain enzymes that will form hydrogen peroxide - which phagocytic cells use to kill bacteria.
Therefore it is important to try and comprehend how reduced flavin can complex and actually reduce oxygen to hydrogen peroxide.
A good combo is wash using hydrogen peroxide - this will kill off anything on the surface, then sprinkle with antibiotic powder.
The gel contains hydrogen peroxide which bleaches the teeth, together with glycerin and purified water to protect your teeth from dehydration.
Peroxisomes - derived from rough ER, that contain enzymes that will form hydrogen peroxide - which phagocytic cells use to kill bacteria.
To prevent this, you heat the solution for some time to decompose the hydrogen peroxide into water and oxygen before adding the acid.
Selenium Selenium is also important in the process of destroying hydrogen peroxide.
It can often help to rinse the mouth with a diluted solution of 3 per cent hydrogen peroxide.
Excess hydrogen peroxide may then react with transition metals to form hydroxyl radical.
I placed the mouthpiece above in a jar containing Hydrogen Peroxide.
Some two hours have passed since I placed the clarinet mouthpiece in the Hydrogen Peroxide.
In the absence of cells, isobutyl nitrite reacted with hydrogen peroxide to form peroxynitrite.
There is a third natural antioxidant enzyme called, glutathione peroxidase which also reduces hydrogen peroxide to water.
The hydrogen peroxide in honey is produced by an enzyme in the honey.
The ' active ingredient ' in the product is usually hydrogen peroxide or carbamide peroxide.
Addition of hydrogen peroxide produces lots of bubbles of oxygen and a dark chocolate brown precipitate.
This enzyme converts dangerous superoxide free radicals to the less dangerous hydrogen peroxide.
Phys., 1888 (6) 14, p. 435); by heating phenol carboxylic acids with baryta; and, in small quantities by the oxidation of benzene with hydrogen peroxide or nascent ozone (A.
Chem., 1866, 9 8, p. 340); by the action of chlorine on steam at a bright red heat; by the decomposition of hydrogen peroxide by bleaching powder, manganese dioxide, potassium ferricyanide in alkaline solution, or potassium permanganate in acid solution; by heating barium peroxide with an aqueous solution of potassium ferricyanide (G.
Remove cat urine stains using a two step process containing baking soda, white vinegar, hydrogen peroxide and dishwashing detergent.
If you do receive a cat bite, you should wash the wound immediately and put hydrogen peroxide on it.
Once the splinter has been removed, treat the area with either alcohol or hydrogen peroxide.
In the laser tooth whitening process, the highest concentration of hydrogen peroxide is used.
The dentist then applies a high intensity light (laser) to trigger the reaction of hydrogen peroxide on your teeth.
The laser-activated hydrogen peroxide breaks down into water and a radical.
This activator is mixed with the hydrogen peroxide at the time of application creating a gel with 25% hydrogen peroxide and a ph of 7.5 to 8.5.
All standard tooth whitening products contain a bleaching gel with either carbamide peroxide or hydrogen peroxide.
Specialized blue-light system allows them to use a concentration of only 15% hydrogen peroxide.
Don't use alcohol, use hydrogen peroxide and warm water and never use Q-tips!
Next, tear off another piece of cotton and drench it with hydrogen peroxide.
He said if Senny looked like he didn't feel well to bring him in, but that I could also give him a teaspoon of hydrogen peroxide to help make him throw up the chocolate.
Epsom salt and hydrogen peroxide are other good solutions.
Unlike other solutions, Clear Care uses hydrogen peroxide to kill any germs that may be in your contacts.
Then, soak the stain in a mixture of one teaspoon laundry or dishwashing liquid with one cup hydrogen peroxide.
It is important to clean mouth wounds thoroughly with salt water or a hydrogen peroxide rinse to prevent infection.
By definition, a peroxisome must contain catalase, which is an enzyme that breaks down hydrogen peroxide.
A 3 percent solution of hydrogen peroxide may also be used.
Demi color contains an alkaline agent such as ethanolamine or sodium carbonate instead of ammonia, and is mixed with a developer containing a very low concentration of hydrogen peroxide.
It's believed these high doses of vitamin C increase the body's hydrogen peroxide levels on a cellular basis, killing cancerous cells.
Avoid using products such as Bactine, Hibiclens, benzalkonium chloride, hydrogen peroxide or rubbing alcohol near the piercing site.
Hydrogen peroxide - Use a solution made of one part hydrogen peroxide and one part water.
Regular household products often serve multi purposes such as using hydrogen peroxide as a general cleaner or vinegar to clean hardwood floors.
On light colored carpets, hydrogen peroxide and water is an excellent way to 'bleach' out or 'severely fade' the urine stain.
For example, hydrogen peroxide removes organic stains such as blood.
Washable Fabrics Pre-treat dry blood stains by combining one teaspoon of laundry or dish soap with one cup of hydrogen peroxide.
Have a care with dark fabrics as hydrogen peroxide may fade them.
You may also use a mixture of half a cup of cornstarch, teaspoon of salt and a quarter cup of hydrogen peroxide to make a paste.
On darker fabrics, replace the hydrogen peroxide with water.
Oil-based stains use the same process, except you'll use hydrogen peroxide instead of dishwashing liquid.
Use an acetone-based nail polish remover to get rid of marker stains on dark granite and hydrogen peroxide to remove it from lighter-colored granite.
If needed, follow cleansing with hydrogen peroxide and an antibacterial cream such as Neosporin.
Avoid rubbing soap directly into the wound and do not use astringents like rubbing alcohol or hydrogen peroxide on the cuts.