At present, there is a content of NMR in the domestic high school chemistry syllabus?

Yes, I am a senior in high school, and I learned a little bit of related content in our sophomore year of high school, but I just learned the results of nuclear magnetic resonance, not learning the principle (he didn't say it when I asked the teacher), it is generally nuclear magnetic resonance hydrogen spectroscopy, which is used to judge the proportion of the type and number of hydrogen atoms in organic matter... Hope.

I am a chemistry competition, except for those who enter the winter camp, they do not learn ultraviolet, infrared, mass spectrometry, and nuclear magnetic resonance, and the college entrance examination syllabus is naturally more unlikely to require, you should take a closer look at what "there is nuclear magnetic resonance content in the college entrance examination chemistry questions", and you are not afraid of laughing to death. For example, "the following figure is the NMR hydrogen spectrum of a substance, from which it can be seen that its structure is xx" or "the following figure is the infrared spectrum of a substance, indicating that there are xx functional groups", is purely frightening, and is basically useless otherwise.

Yes, I am a high school student in Guangdong Province, and we are studying NMR hydrogen spectroscopy, which is to identify how many hydrogen atoms (equivalent hydrogen) there are in organic matter. In addition to this, there is infrared spectroscopy, which distinguishes chemical bonds, and mass spectrometry, which determines the relative molecular mass of organic matter. Wait a minute!

It seems that some provinces can be set by themselves, but in fact, some knowledge is just for everyone to know, not for students to understand what is going on!

When talking about organic, it involves a little bit, just to determine the composition and proportion of matter, and the exam may appear as a known condition, which is not very important, but if you don't know, you can't do the sure question.

I'm here in Mianyang, so I don't have it, just a brief introduction. The teacher still has to give a lesson.

Oh, that's not all, there are also some things that can only be learned in college, such as hybridization, high school, these are simple understandings, and the college entrance examination is also very simple, which is in the new curriculum reform textbook.

Jiangxi Province has NMR hydrogen spectroscopy.

The hydrogen absorption peaks of the two methyl groups in methyl acetate CH3Cooch3 are not the same (the chemical environment is different).

The hydrogen absorption peak in methyl ether CH3-O-CH3 is the same (the same chemical environment).

In m-xylene, the absorption peaks of hydrogen between the two methyl groups on the benzene ring are not the same as those of other hydrogen on the benzene ring (the chemical environment is different).

A few upstairs, that can only be said to have 5 groups of peaks, not 5 peaks.

According to the chemistry you wrote, there are five types of hydrogen from left to right, and the number of peaks is in order. So it's a total of 19 peaks.

ps:How do you learn MRI in high school now?。。。

Addendum: The two hydrogen adjacent to each other on both sides of the oxygen atom are asymmetrical, because the one on the left has a CH3 to its left, and the one on the right, its right is CH2; So it's in a different chemical environment.

Give you the NMR spectrum of this compound, and count it yourself if you don't believe it.

The three absorption peaks in the NMR hydrogen spectrum indicate that there are three hydrogen atoms in the molecule, and the area ratio is 2:1:3, indicating that the ratio of the number of the three hydrogen species is 2:1:3

Then the substance will not be C6H6, and there are many substances that meet this condition, such as ethanol.

Olefins such as 1,2,3,4-tetrahexene are very unstable and difficult to exist.

5 peaks and two on the ethyl group.

There are three on propyl.

You can find out how many hydrogens are carried on the adjacent carbons, and what kind of groups these hydrogens are in, and the area is proportional to the amount of hydrogen.

1. N peaks and cracks mean that there is n 1 hydrogen on the carbon next to it.

2. The value of the benzene ring is the largest, the value of the methyl group is the smallest, and the hydroxyl group is in the middle.

Based on the number of peaks, it is known that there are several hydrogen atoms in different environments.

Based on the area of the peak, which can be approximated as the height of the peak, the proportional relationship of hydrogen atoms in these different environments can be found.

The number of peaks in the resonant hydrogen spectrum represents several types of equivalent hydrogen.

Based on the area, the equivalent ratio of hydrogen can be found.

There are 3 absorption peaks in the NMR hydrogen spectrum, indicating that there are 3 hydrogen atoms in the molecule, and the area ratio is 2:1:3, indicating that the ratio of the number of the 3 hydrogen species is 2:

1:3 then the substance will not be C6H6, and there are many substances that meet this condition, such as ethanol.

Olefins such as 1,2,3,4-tetrahexene are very unstable and difficult to exist.

If you read an article in my space, I believe you will have some experience.

Finding a teacher yourself is too troublesome to type.

Amount ......Too much, right?

But you can take a look at the information.

Basically, all the knowledge points in high school chemistry are involved, and the extended 1 redox reaction.

2 Oxidizing and reducing agents.

3 Alkali metals.

4 The amount of matter.

5 The amount and concentration of the substance.

6 Chemical calculations.

7 Cross-crossing.

8 Halogens. 9 Periodic Law.

10 Extranuclear electrons are at the mercy of the nucleus.

11 Oxygen group elements.

12 Carbon group elements.

13 Nitrogen group elements.

14 Chemical equilibrium.

15 Ionization equilibrium.

16 Hydrolysis of salts.

17 Several important metals such as iron and magnesium.

Aluminum-18 Organic Chemistry Basics 19 Hydrocarbons.

Functional alkyl aldehyde carboxylic acids.

Halogenated hydrocarbons20 crystal structure.

21 Colloids.

22 Electrolysis.

24 Thermochemistry.

Compulsory 1 and copy2 in the first year of high school are to lay the foundation, mainly for the introductory, like the above you said basically will be involved.

After the division of arts and sciences, I will open electives I studied electives There may be 2 These electives are deepened, broadened, and made more difficult Among them, elective 4 college entrance examination is compulsory He is also the most difficult to learn The knowledge points are very complicated.

Organic is the easiest to master.

What you say has detailed knowledge points in books or workbooks, so I won't say much about them.

It has a center of symmetry, and h that is symmetrical into the center is equivalent.

So there are 4 types of hydrogen.

H of the same color in the diagram is equivalent.

There are several different carbon atoms, and there are several different NMR hydrogen spectra;

Symmetrical center with the red dot in the middle.

The type of hydrogen is indicated.

Because there are four kinds of hydrogen, count yourself, one on the methyl group, and three on the benzene ring. Symmetrical.