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1.Back to the periodic table, generally junior high school only requires mastery of the top 20.
2.Back the equation, back the positive and negative valence, master the balancing method.
3.Back metal activity order.
The above are the basics, and the next calculations are very easy to learn after laying a good foundation I have a mantra for positive and negative valence:
Monovalent potassium hydrochloride, sodium silver, divalent oxygen, calcium barium, magnesium zinc.
Tri-aluminum, tetrasilicon, pentanitrogen, phosphorus, di-triiron, di-tetracarbon.
246 sulfur is complete, and copper and mercury are bivalent and elemental zero.
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1) The basis of the foundation is to memorize equations.
2) Understanding important theories helps to memorize equations.
3) Do the appropriate amount of questions and master the skills of chemical calculation.
Chemistry should be easier to learn than physics, and as long as you do it properly and work hard, getting a good score is not a problem
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Junior high school chemistry is still quite simple, all are basic problems, when I was learning, the teacher told us to mainly memorize, memorize some equations, reaction phenomena, that is, so much, when learning may feel unorganized, things are very miscellaneous, but they are all relatively simple things, serious no problem!
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Junior high school chemistry is relatively simple, that is, memorization, but not only memorization, but also a little understanding, because junior high school chemistry is only a few chemical equations. Chemical equations and the physical properties of matter are crucial, and these should be memorized.
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First of all, I think it is important to develop an interest in chemistry as a subject. If your family conditions allow, I recommend that you buy a set of mainstream American high school science textbooks on Excellence.com, which is chemistry. Of course, other subjects are also very good, but they have nothing to do with chemistry.
Then read more popular science books on chemistry, so that on the one hand, you can expand your knowledge of chemistry, and on the other hand, you can deeply feel that chemistry is not only interesting, but also more useful.
Secondly, buy a chemistry reference book with detailed explanations, prominent difficulties, and clear ideas. Another point is that the book you buy must be something you like, otherwise you won't have a strong interest in it and read it often, remember, it must be what you like and want from the bottom of your heart.
Thirdly, you should go from easy to difficult when doing the questions, so that you will have a great sense of accomplishment, and the more accomplished you are, the more you want to continue learning, which forms a virtuous circle.
Then, if you want to master the knowledge points, I suggest you read the Chemistry Basics Handbook; If you want to do classic college entrance examination questions, I suggest you watch the five-year college entrance examination three-year simulation.
Finally, I sincerely wish you to learn high school chemistry well as soon as possible.
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Chemistry isn't as hard as you might think.
Mainly memorize those things in the book.
There is also a very regular law to be found in chemistry.
A lot of things can be remembered in relation to each other. Remember the typical reaction of the multi-point that the back is memorized down.
There's nothing wrong with that.
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Chemistry is a fascinating subject. However, due to the characteristics of high school chemistry as "complicated, difficult, and chaotic", many students find it difficult to learn high school chemistry. So how can you learn chemistry in high school?
1. Listen carefully and take good notes.
Good notes are the condensation, supplementation and deepening of textbook knowledge, and the presentation and refinement of the thinking process.
Since the knowledge points of chemistry are numerous, fragmented and scattered, in addition to listening carefully and thinking positively, in addition to listening carefully and thinking positively, we should also write down the key and difficult knowledge of the teacher in our own words on the basis of understanding, so as to facilitate future review.
2. Review in a timely manner.
Revision is not just a simple review of knowledge, but considering the interconnection of old and new knowledge in one's own brain, and reorganizing it to form a new body of knowledge. Therefore, after class, it is necessary to review the content of the lecture in a timely manner, and do a good job of sorting out and summarizing the knowledge, so as to make the knowledge integrate and avoid the phenomenon of more and more chaos in learning. For example, if you learn about the bleaching properties of SO2 and chlorine water, you can compare them to find out the differences.
3. Learn to memorize.
Since there are many chemical knowledge points to memorize, it is difficult to memorize them if you rely on rote memorization, so you should learn to memorize them skillfully. The commonly used memorization methods in chemistry are: comparative method (often used for knowledge that is easily confused and interferes with each other.
The four similar concepts of isotope, allotrope, homologue, and isomer can be deepened and remembered through comparison. ), induction, song recipe memory, comprehension memory, and experimental memory.
Fourth, diligent practice.
Practice is an important way to understand, digest, and consolidate classroom knowledge. However, the practice should be targeted, not a sea of tactics, and should be aimed at mastering the basic methods and the rules of problem solving. In the process of problem solving, it is necessary to pay attention to multiple solutions and inductive summarization of one problem, so as to achieve the effect of doing one problem and one category.
For example, the techniques commonly used in chemical calculation include: conservation method, relational method, extreme value method, average value method, estimation method, difference method, etc.
5. Prepare a "mistake book".
The purpose of the questions is to develop abilities and find effective ways to find your weaknesses and deficiencies. Therefore, mistakes should be corrected and recorded. When recording, you should analyze the reasons for the error and the correct solution idea in detail, and do not simply write an answer.
At the same time, it is important to go through the review frequently so that you can avoid similar mistakes in the future.
6. Pay attention to chemical experiments.
Chemistry experiments can not only cultivate students' observation, thinking, hands-on and other abilities, but also deepen their knowledge and understanding of related knowledge, so we must pay attention to chemical experiments. When doing experiments, we should ask a few more whys, think about how to do it, why we do it, and what else can be done, so as to achieve the purpose of "knowing what it is and why it is true".
In addition, in order to study chemistry well, we should pay more attention to social hot issues and life problems related to chemistry, and be good at combining book knowledge with practice.
In short, as long as you learn the right way, I believe you will learn chemistry well easily.
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Cultivate your interest and read more interesting storybooks about chemistry.
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Chemistry is actually one of the best sciences to learn, and it is like a liberal arts in science. Understanding the principles of chemistry is an important step in learning chemistry well.
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Cultivate interest and take good notes. '
Isomers are a difficult problem for many high school students to learn chemistry. If you stand in the perspective of the college entrance examination, you just need to learn to judge well and simply write isomers from the molecular formula. >>>More
I can give you a suggestion :
1.When you are reviewing, you can't just think about what the answer is, because physics is the truth of things, and you are good at explaining phenomena with reason, explaining according to ordinary people's thinking, and you must make yourself feel that there is no problem with the explanation; You can't just think about the high score, if the phenomenon is really explained correctly, then the high score will naturally come. >>>More
I'm also having the same issue.
The question you are asking is relatively large.
Summarize experience in a timely manner and cultivate interest. Through careful study, thinking, and summarizing, you will continue to improve your interest in science, and if you are interested, it will be easy for you to enter the palace of science. >>>More
Spend some time every day memorizing the basics. If you have done it once, you are not allowed to make mistakes again, otherwise, if you do it, you will not do it. Memorize a few classic example questions for each question type, and you will definitely get something. >>>More