Is hydrogen peroxide a physics teacher in Xiao Shuang? Chemistry? Biology? The first substance used to make oxygen mentioned in science class, the expression of this molecule is H2O2, and the structural formula is H? o？ o？ H, almost perfect! ! At the same time, its aqueous solution is also called hydrogen peroxide. In fact, everyone has been exposed to it more or less. When going to the dentist, doctors often disinfect their mouths with hydrogen peroxide. That smell. . . what can I say? . . It's a little bitter and sour, but it's not delicious anyway.

Speaking of hydrogen peroxide, I have to say that junior high school students in China all know the experiment of hydrogen peroxide decomposing to produce oxygen? It should also be the first chemical experiment that many students did by themselves! In textbooks, we use manganese dioxide, a black solid which can effectively catalyze the decomposition of hydrogen peroxide. So, have any friends ever wondered why manganese dioxide can change the rate of this reaction?

In the course of the reaction, manganese dioxide participated in the reaction to form an intermediate product, but after the reaction, it returned to its original state and still maintained its original chemical composition and quality. Manganese dioxide decomposes a very difficult reaction into two relatively easy reactions through its own efforts, which reduces the difficulty coefficient of hydrogen peroxide decomposition and improves the oxygen production rate.

Hydrogen peroxide is really worthy of having this partner in this life, and manganese dioxide is really its right-hand man for decomposition! As we all know, reality often hits the face, and plastic love always falls to the ground when touched.

? Small sample, you are just one of my many lovers? Hydrogen peroxide raised his eyebrows and looked contemptuously at the rainy manganese dioxide in the pear flower. . . (In an instant, the brain made up a big play)

So, what harem does hydrogen peroxide have?

0 1 blood

High energy ahead, please take the children to watch!

Little friends, did you see any bubbles coming out when you disinfected the wound with hydrogen peroxide? Yes, it is the oxygen formed by the decomposition of hydrogen peroxide! !

Wow! It turns out that my blood can have this effect

Teenager! Your body contains countless potentials.

Blood contains a catalase, which can catalyze the decomposition of hydrogen peroxide to produce oxygen and produce dense foam. Peroxide is the waste naturally produced by all aerobic organisms, and catalase is an active oxygen scavenger, which can decompose active oxygen such as hydrogen peroxide and superoxide anion. Toxic to the body, especially the plasma membrane. Catalase in the blood removes these substances all the time, giving the body a clean and healthy environment.

So where does catalase come from?

In fact, our cells contain peroxisome, which was first discovered by J. Rhodin( 1954) in rat renal tubular epithelial cells. This is an uneven organelle with a diameter of about 0.2~ 1.5um, usually 0.5um, which is round, oval or dumb. * * * is characterized by containing one or more oxidases and catalase (also its marker enzyme)!

Therefore, not only blood but also liver has ultra-high concentration of catalase. Next time, if possible, buy two or two fresh pork livers, and ask the boss to cut them and take them to the laboratory (chao), the laboratory (yi) and the laboratory (chao) ~

02 ah! potato

When Mr. Xiao Shuang took his first chemistry experiment class, did he ask the future school? The children took potatoes to the lab. Sure enough, many students lived up to my expectations and didn't bring potatoes. . . Teacher Xiao Shuang's heart is real. . . Ten thousand words are ignored here. At this time, I am a little envious of the teacher who brought a pot of fish to school. At least they brought it. The point is! I still want to buy it!

So, what do you do with potatoes? That's right. Cut into shreds, put them in a pot and catalyze the decomposition of hydrogen peroxide! ! Potatoes are rich in catalase. When hydrogen peroxide drops, a large number of white bubbles pop up with a swish, filling the whole conical bottle. In fact, it's not just potatoes, vegetables, spinach, apples, etc. It can catalyze the decomposition of hydrogen peroxide (see here, manganese dioxide cried and fainted in the toilet, saying that it would last a lifetime. . . Double).

Experiments show that the catalytic efficiency of carrots and potatoes is obviously stronger than that of spinach and apples, so why don't we use carrots in our laboratory? Maybe. . Teacher Xiao Shuang guessed. . . This is about the same color as vomit. . . It is to prevent some people from feeling uncomfortable after seeing it ~ ~ high energy in front. Please watch it with your children.

03 rust

Manganese dioxide thinks that those Yingying Yanyan are all organic matter after all. In the field of inorganic chemistry, I am the only one who has hydrogen peroxide, which is enough!

It has been proved that H2O2 can be decomposed by many metal oxides, and manganese dioxide is not unique. Similarly, salt solutions of some metals can also be used, such as ferric chloride. Their principles are basically the same, and they all produce intermediates, which can split a difficult reaction into two easy reactions and accelerate the catalysis of hydrogen peroxide.

Since we can't be together, why not forget each other? Manganese dioxide thinks so, and it's not bad to talk about a Buddhist love.

Awakening of manganese dioxide

After realizing the powerful harem of hydrogen peroxide, manganese dioxide became more sober. It realizes that it can play more roles, catalyze more reactions and even play more roles! As a result, there was such a reaction in Xiao Shuang's class:

As a catalyst of potassium chlorate, manganese dioxide sticks to potassium chlorate in the reaction, and is tightly wrapped by molten potassium chlorate when heated, and oxygen bubbles are constantly emerging?

In the reaction of potassium permanganate decomposing to produce oxygen, manganese dioxide gave up the position of catalyst and tried to make a product! A purple mother (potassium permanganate is a deep purple solid) may also give birth to a black son (manganese dioxide is a black solid).

General catalysts have encountered manganese dioxide. Because a reaction can be catalyzed by multiple catalysts, at the same time, a catalyst can also catalyze multiple reactions. However, there are also some more specific catalysts ~ ~ ~

So, children, when you kissed me warmly on campus, why not ask love rat how many girlfriends you had?

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