I am a sophomore in high school, and I have a bad foundation in chemistry, and I would like to ask s

I'm thinking about Eun, in fact, organic is the simplest, you look at the problem specifically, in fact, it is enough to memorize the reaction of each group.

1 hydroxy group: Elimination: concentrated sulfuric acid 170 °C substitution: hydrogen halide esterification: carboxylic acid reversible (phenols with FeCl3 purple).

2 double bonds: Bonus: hydrogen, halogen, hydrogen halide can't be lost.

Now you should read more books, memorize the important chemical reaction equations, which is the most basic, and then combine the books, do some questions, do not seek more but to do fine, hehe, I wish you success in your studies.

Simply divided into hydrocarbons (alkynes, alkynes, benzene (aromatic hydrocarbons)), alcohols (hydroxyls), aldehydes (carboxyl), esters, halogenated hydrocarbons, phenols.

So much to think of for the time being).

Then there is the reaction of hydrocarbon-alcohol-aldehyde-acid + alcohol-ester alcohol-acid hydrocarbon-halogen, aromatic hydrocarbon-phenol (—bidirectional).

Then there are the reaction conditions, and the properties, etc. (the word limit ends here).

I've got some of the summaries, you leave an email and I'll send it to you.

It turns out that I am not good at chemistry, but I do all the notes, the third year of high school, I memorized the basics in the notes, the grades are up, borrow the notes of my classmates I must listen carefully to the teacher in class, do more inference questions, exercise my sensitivity to chemicals, if you don't ask quickly, there are many chemical foundations, you have to summarize by yourself, you must correct the wrong book.

The sophomore student suggested buying "Each Break", it is a series, it seems to be a total of three, the front is a summary of knowledge, and there will be exercises to consolidate in the back, and his questions are relatively new, very good. At the same time, it is recommended to memorize the previous summary every day. It's important to persevere!

There are too many things, give me your mailbox.

Organic chemistry is mainly composed of hydrocarbons and derivatives of hydrocarbons, which can be divided into: alkanes, olefins, alkynes, aromatic hydrocarbons, etc., and derivatives of hydrocarbons: halogenated hydrocarbons, alcohols, phenols, aldehydes, acids, etc.

You can draw inferences from each other by grasping the structure and chemical properties of their representative substances, in fact, organic chemistry in high school is not difficult.

First of all, it is divided into organic chemistry and inorganic chemistry, and there are some small branches like thermochemistry and electrochemistry, the important ones in inorganic are three acids and two "bases", as well as the properties of several important elements and their compounds, such as o n na, mg si al, etc.

It is recommended that you don't waste looking for knowledge points on the Internet, and you are given the knowledge points that are difficult for you to digest You can buy some teaching aids You don't need to take more than one copy each, if you want to explain the knowledge points in detail, I recommend you Rongdeji's "Anatomy" to read the textbook while reading the knowledge points above and then do the questions.

1 List the various common chemical substances and their characteristics, such as alkanes General chemical formula Common properties of alkanes Including Methane Physical properties Chemical reactions that can occur Mentioned in the textbook! Just sort out the materials in the textbook and read them often when you have time!

Summary. Whether an individual can find problems or be good problems in the learning process indicates the strength of his learning level and ability. From the perspective of students' learning of chemistry, it is often one of the common problems in the process of learning chemistry that students do not have problems or cannot ask good questions.

The reason for this problem is that the basic knowledge in the learning process is not reliable, and it is not good at grasping the internal connections and differences between things, and it is not good at observing and thinking. Because of these deficiencies, many students turn a blind eye to the problem and fail to spot it. The learning process is one of constantly discovering problems and solving them on that basis.

End. The process of reciprocating and reciprocating. Therefore, if you don't ask for a good idea, you can't take the initiative to learn, which will lead to learning to buy one and get one free.

High school chemistry, I'll ask some questions.

Whether an individual can find problems or be good problems in the learning process indicates the strength of his learning level and ability. From the perspective of students' learning and learning, it is often one of the common problems in the process of learning chemistry that students do not have problems or cannot ask good questions. The reason for this problem is that the basic knowledge in the learning process is not reliable, not good at grasping the internal connections and differences between things, and not good at observing and thinking.

Because of these defects, many students turn a blind eye to the problem and are unable to spot the chain car volt problem. The learning process is a process of constantly discovering problems and solving problems on this basis. Therefore, if you don't ask for a good idea, you can't take the initiative to learn, which will lead to learning to buy one and get one free.

The fourth size relationship, why are carbonate ions greater than bicarbonate ions?

The primary ionization of dibasic acid is much greater than the secondary ionization, which is the law that the equilibrium can prove, from a microscopic point of view, the carbonate ion with two negative charges, the junction of the megahydrogen ion is naturally stronger, and the bicarbonate section of the blind root ion holds a negative charge, and there is a proton in the outer layer, which is naturally weak.

Both carbonate and bicarbonate will be hydrolyzed in water, and the mu is forming carbonic acid. In this process, water gives hydrogen ions, so hydroxides are left to make the system alkaline. However, the ability of carbonate and bicarbonate to bind hydrogen ions is different, so the number of hydrogen ions given by water is also different, resulting in different alkaline strengths of the system.

We'd be glad to be able to help you, do you have any other questions that you can ask us to help you? If not, can you give Shoujue a thumbs up? At the same time, if you have any other questions in the future, you can click on my avatar to enter my slim homepage for consultation, I wish you a happy life, goodbye. ❤️

In fact, chemistry is not difficult, you have to change your attitude, don't think that you can't learn chemistry well, mentality is very important!

First of all, you should be familiar with the main family elements and the commonly used subfamily elements. The reactions that appear in the book and are involved in the teacher's lectures should be remembered accurately, and if you don't know the equations, you also need to know the phenomena, as well as the testing and processing of some reaction products.

Secondly, learning chemistry can be done by analogy. What are the commonalities of the elements of the same main group and the same period, and what are the laws of gradual change...

There is also the question question, the sea of questions tactics may not be useful, but it is certainly right to be well-informed. It's like inference questions, experimental questions, all the same. If you see more, you will know it.

Just some personal opinions, I took the college entrance examination chemistry more than 90, of course, I like chemistry very much, I hope it will be of some use to you.

There are many laws, whether organic or inorganic, and it is very simple to find chemistry by summarizing the laws yourself, and then find special cases from the laws. Inorganic is summarized according to the family, and then according to the cycle to see the changes, organic is hydrocarbons and their derivatives, there are laws to follow, in short, everything depends on yourself, when you summarize and master, you will find benefits. Then just practice more.

If the economy is okay, find a tutor for a college student (chemistry major), you list all the problems you don't understand (book knowledge and exercises you don't understand), and then use the tutor time to solve them. I once tutored a student for two weekends (one weekend and one day) and then he took the exam and got into college.