Advice 1: Why hydrogen peroxide fizzes

Most often the reaction of the hydrogen hiss surprised the children whose parents treated the wound. This process is of interest and confusion, not less interesting and the reasons that cause the liquid to bubble vigorously.
Why hydrogen peroxide fizzes
Hydrogen peroxide is the simplest representative of peroxides, it is colorless, has a metallic taste, infinitely soluble in water, alcohol and ether. Peroxide is the most common antiseptic, it disinfects the wounds and symptoms of skin irritation, kills them in all sorts of infection.

The oxidation reaction

Peroxide is the strongest oxidizer, if even a drop gets on any part of human skin, immediately there is a reaction, a white spot appears, which can be considered as a dead site on which there are no viruses and bacteria.
Hydrogen peroxide, oddly enough, is a form of oxygen.

Perhaps the most common explanation for the hiss of hydrogen peroxide is its property in contact to disintegrate and oxidize. And she breaks up with liberation of oxygen, which is accompanied by some hiss. While in the jar, hydrogen peroxide is fairly stable, but it's worth it to react with the blood in the wound, it immediately breaks. Many believe that using foam, which is released when the hissing, go outside and dirt, and microbes.

A useful poison

Hydrogen peroxide contains a small amount of toxic substances that allows its use in all spheres of human life. You will not believe, but there are hundreds of ways of its application. Just imagine, hydrogen peroxide is used:
in teeth whitening,
- in the treatment of acne,
- in surgery, burns,
- when refueling of air conditioners and cleaning the filters
- rocket fuel
- in the food industry.

These areas are not linked, but the hydrogen peroxide used everything. In medicine hydrogen peroxide is used as disinfectant, in the treatment of wounds after accidents, purulent skin, various body lesions, in order to disinfect and to ensure the purity and sterility of the damaged area of the skin. In contrast to the solution of brilliant green, hydrogen peroxide is more compatible with sensitive mucous cells, not burn them and only washes and disinfects. However, as with any active drug, once in the eye, peroxide is irritating, so, you should immediately wash and go to the doctor.
Hydrogen peroxide is sometimes even taken internally for medicinal purposes.

Is hydrogen peroxide got in the fight with sulfuric plugs in ears: a drop of hydrogen into the ear and starts to sizzle, the patient hears the sound, this is probably the most annoying thing in the procedure! Peroxide reacts with sulfuric tube, it just destroys it with its powerful substances.

In addition, the hydrogen peroxide used in the processing of common goods (pens, microphones, glasses in movie theaters), and medical equipment: it is poured into special containers in which they place various medical subjects that they undergo complete disinfection. Thus treated product aseptic and safe.

Advice 2: Why a cat hisses

From the point of view of a cat hissing is a perfectly natural reaction to an unpleasant stimulus to the animal. The person will need a certain amount of patience to understand the reasons why his cat hisses. But later he will be easy to reassure your pet or even to avoid stressful for both situations.
Why a cat hisses

Hiss - this is normal

First you must understand that hissing is a normal sound for cats, like meowing or purring. In nature animals use it not so rarely to communicate with relatives, to declare their rights to territory or food.Most often, the hiss goes well with his cat in a certain position, namely a pull up the back and tousle the tail. Taking such a position, the animal makes clear that it is ready for defense, and the enemy better walk away if he does not want to suffer physically.

Causes hiss

Sometimes a cat may begin to hiss out of fright or she simply found something interesting and wants to share it with other people, or do whatever. In General, the same from a human point of view sound can be caused by a variety of reasons, and to understand what happened, you just need to take a closer look at the animal.

The most important rule is to never punish the cat suddenly sasupensu. Most likely she did this, along with sudden stress, the punishment in this case will only aggravate the situation, will not help razobratsya the causes and prevent such behavior in the future. It is possible that the animal at this point just eat and considered your approach as an attack on a tasty morsel. Especially such behavior sin kittens have not yet learned the conventions of the social hierarchy. Or maybe just something fell from the hands to the floor with a loud thud. Then certainly we can say that the hiss was caused by severe fright.

Playing with the kitten, do not provoke him to hiss, so he doesn't think it's appropriate in everyday life.

The domestication of cats

And only if from your point of view, the cat hisses without any apparent reason, you can try to wean her from this bad habit. If the hiss is a reaction to your approach, it is better to leave the animal at some time in peace and give him the opportunity to get used to you. You can sit nearby on the floor, without trying neither to approach the animal or to summon him or to lure a treat. Just be there and sooner or later the cat will cease to show fear, perhaps even showing some interest. But at this point, you can't be impatient, start making a hasty movement towards her. Stay there, talk with her quiet gentle voice, wait until the cat itself is not suitable to you and are willing to RUB my face on your hand.

Never strike a cat, a far greater educational effect can be achieved by sprinkling it with water from a spray bottle.

Education cat

If the hissing is accompanied by scratching or worse yet, sudden attack by a cat, you need to take her otosheniya stringent measures. Learn the answer to simply say - no, then ignore the animal until then, until it has itself come to you. It is in any case sooner or later it will, though, because you get hungry. Exactly the same line of conduct should adhere to the rest of the family. So you have clearly identified the social status of cats in the house, she will have to obey the rules, recognize in you a higher rank person, sizzle which is in any case impossible.

Advice 3: How to get hydrogen peroxide

Peroxide of hydrogen – heavy polar bluish liquid with a melting point T ( ~ )=-0,41 C and a boiling point T(Kip.)=150,2 C. Liquid peroxide H2O2 has a density of 1.45 g/cm^3. In everyday life and in laboratory conditions typically use a 30% aqueous solution (perhydrol) or 3% solution of the substance.
How to get hydrogen peroxide
H2O2 molecules in the liquid state are strongly associated, due to the presence between them of hydrogen bonds. Since hydrogen peroxide can form more hydrogen bonds than water (for every atom of hydrogen has more atoms of oxygen), its density, viscosity and boiling point, respectively, above. It mixes with water in all respects, and pure peroxide and concentrated the solution in the light explode.
At room temperature, H2O2 catalytically decomposes to release atomic oxygen, hence its use in medicine as a disinfectant means. Usually take the 3% antiseptic solution.
In the industry hydrogen peroxide is obtained in the reactions with organic compounds, including, for example, catalytic oxidation of isopropyl alcohol:


Acetone (CH3)2CO is a valuable byproduct of such a reaction.
Also H2O2 is produced industrially by electrolysis of sulfuric acid. In this process, the persulfuric acid is formed, the subsequent decomposition of which gives the peroxide and sulfuric acid.
In the laboratory peroxide get usually the action of dilute sulphuric acid on barium peroxide:


Insoluble barium sulfate precipitates.
The peroxide solution has an acid reaction medium. This is because of the H2O2 molecules dissociate on the type of the weak acid:


The dissociation constant of H2O2 – 1,5∙10^(-12).
Showing the properties of acids, hydrogen peroxide interacts with bases:

The peroxides of certain metals, such as BaO2, Na2O2, can be considered as salts of hydrogen peroxide is a weak acid. Of them just get in the laboratory H2O2 by the action of stronger acids (e.g., sulfuric), displacing the peroxide.
Hydrogen peroxide can react in three types: without a change in the peroxide group, as a reductant or as an oxidant. The last type of the most characteristic reactions for H2O2. Examples:



The hydrogen peroxide finds wide application. It is obtained from the bleach entered into synthetic detergents, various organic peroxides; it is used in the polymerization reactions for the restoration of paintings on the basis of lead paints and to obtain antiseptic.
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