To learn chemistry well, we must first understand that no one is born to learn chemistry well. Those students who seem to be excellent in chemistry must have mastered the correct methods (instead of learning from others, they should have summed them up by themselves, and what suits them best is the best, and others can only serve as a reference and play an enlightening role), and with a lot of efforts, without these successes, they are castles in the air. Knowing this, you can make your chemical level advance by leaps and bounds. The following are my suggestions for reference only. Chemistry is a "liberal arts in science", which includes not only scientific calculation and logical thinking, but also memory and understanding. When we look at chemistry, we usually pay more attention to the scientific elements, ignoring or not paying enough attention to the liberal arts elements. First of all, we should read the textbook several times and get familiar with the knowledge points, because the source of information for our study and examination is the textbook. If you are determined to change your situation in chemistry, this should be the first step. Pay attention to the lecture in class, keep up with the pace of the teacher's thinking, even if there are questions you don't understand, put them aside first, write them down simply, and discuss them with the teacher after class. Don't worry, the teacher won't look down on you because your grades are not satisfactory. Teachers always like studious students. He will definitely answer you seriously. Give it a try. The role of teachers in your learning process can not be ignored. Learn to get the information you need from the teacher, and your progress will be faster. We must make full use of the priceless resource of teachers. Review immediately after class, clear your mind, and think about what the teacher said in class, what points to pay attention to, and whether the whole story is clear. When you encounter similar or different properties, you should find out the reasons and compare them with your memory. We need to know not only why, but also why. If you don't understand, you must ask questions in time, and you can't leave any questions, because you may forget to make it clear in the future, or it will affect the subsequent study and become an obstacle or blind spot. What chemistry subjects are most afraid of is that there are loopholes in the knowledge structure, which leads to the obstruction of thinking, especially inference questions. I don't know if you feel this way. To learn chemistry well, it is very important to have your own thinking and summary. Periodic law of elements: the commonness and characteristics of each main group element should be clear. For example, in halogen, chlorine can replace bromine in solution, and bromine can replace iodine in solution, but fluorine can't replace chlorine because fluorine will react violently with water. For another example, regarding the first ionization energy, Li~F should increase gradually, but n is slightly higher than the adjacent O. Why? Because the 2p orbit of n is half full, it is relatively stable. Thinking in this way is not only conducive to eliminating obstacles in the learning process, but also conducive to improving the level of chemical thinking. The sense of accomplishment after solving problems can also enhance the interest in learning chemistry, which is undoubtedly a catalyst for chemistry learning. Teachers should pay attention to some thinking angles in learning, such as redox thinking, whose essence is the gain and loss of electrons or the movement of electron pairs. There must be electron gain or loss or electron pair movement in redox reaction, and it must be redox reaction if there is electron gain or loss or electron pair movement. At the same time, it should be sensitive: Fe3+ has strong oxidation, and nitrate ions are also under acidic conditions (oxidation of nitric acid). Sulfur ions and sulfite can exist in alkaline conditions, but not in acidic conditions. Hypochlorite ion is oxidized by chlorine with valence of+1, so it is oxidized under both acidic and alkaline conditions, but it is stronger under acidic conditions. Conservation thought (which is very important throughout, and sometimes can greatly improve the efficiency of solving problems), including mass conservation, electron conservation and so on. When solving problems, we should try our best to find equivalence relations and set unknowns, so that general questions can be solved; Balance your mind, everything is balanced, and carry out the chemical balance to the end! All chemical reactions have rates and limits. With this awareness, sometimes things are easy to understand. In primary and secondary thinking, we should distinguish primary and secondary factors. For example, in ammonium chloride solution, ammonium ion hydrolysate is acidic, and the generated hydrogen ions combine with ammonium ions to form ammonia monohydrate, and then hydroxide ions are ionized. Is the solution alkaline again? Obviously impossible. We should pay attention to the fact that ionization and hydrolysis are small reactions. Ammonia monohydrate is produced by hydrolysis products, which is very small in itself and only a small part is ionized. The main cation in the solution is ammonium, and its hydrolysis is the main reaction, and ionization is the secondary reaction, so the solution should be acidic. In addition, we should pay attention to the reasonable combination of different thinking methods. For example, an important implicit condition in redox reaction is the conservation of electron gain and loss, and listing this equation can often get twice the result with half the effort. These examples just want to tell you that to learn chemistry well, there must be a process of self-summary and reflection to find out the reasons for various knowledge points. If you want to get into the habit of independent thinking, you really can't figure out how to ask your classmates and teachers again, because your grades are more impressive in your mind and have higher gold content. It's also a good idea to discuss with classmates. After-class exercises must be done, but not too much. Just choose a better one. After many exercises, I usually start to be ambitious, but later I get busy or can't cope with it at all, and the effect is much worse. From easy to difficult, build confidence. For example, a complete dynamic answer to the textbook or Wang Houxiong's Handbook of Important and Difficult Points is enough. After finishing the task assigned by the teacher, use it to consolidate and lay a good foundation, so as to improve step by step and steadily. In fact, it is not important to set the wrong questions, rather than simply recording the wrong questions and positive solutions. What matters is what you think from this problem, what thinking method will be faster and less likely to make mistakes, what characteristics the problem has, and whether there is a general solution to similar problems. The benefits of doing this are obvious: while training chemical thinking, the next time you see a similar topic, you can draw inferences, reflect quickly, find a solution quickly, and win time for other topics. Don't be burdened when you study, especially don't set an unrealistic goal for yourself. We should be clear about our position, and then try to catch up with the students who are better than ourselves, usually the students who are stable in the top 2~4. With progress, don't sell yourself short, there is still a long way to go, step by step, don't expect to reach the sky in one step. At the same time, chemistry is a subject with high rate of return. As long as you are willing to work hard to lay the foundation, even if you don't see obvious improvement within half a month, your actual level will still improve. Keep working hard, and you will see your change soon. One day you will be at the top of your class. This is my own experience, and I have experienced your stage. I was not good at chemistry at first. When I was a freshman, the test paper 100 passed 59, but slowly I found that I fell in love with chemistry, and chemistry became my hobby. Now I can control the deduction in the test paper with a score of 150 or 120, and my chemistry score is definitely among the best in my class. Be confident! Believe in yourself, chemistry will become your faithful partner and bring you happiness and passion.

Satisfied, please adopt.