How to learn chemistry well in junior high school Solution, chemistry class, I feel like I can t und

It's best to preview before class, and then you have to take notes well during class, and you have to review carefully after class Do your homework well is for sure.

Actually, chemistry in the third year of junior high school is not difficult, of course, if you want to do well in the test, you must be smart, if you are not smart enough, you have to work hard

If you have the time, you can also make a book of mistakes and write down the questions that you get wrong, especially the ones that you get wrong often.

It's best to have the problem solving process below, you can take a look at it when you review.

If you don't understand a question after class, be sure to understand it and ask your teacher or classmates.

You can also buy a textbook or homework book to do when you have time at home.

The above methods are useful for any discipline.

Of course, chemistry is a special kind of science, and it's an experiment-based discipline.

Therefore, when doing experiments, you must also carefully observe the phenomena, and it is best to record them, because some topics are combined with experiments, and if you don't do experiments, some topics will not be done.

Of course, the specific situation is analyzed, and you still have to learn according to your actual situation.

I just finished the high school entrance examination this year, and in fact, I think that as long as you can study seriously in junior high school, your grades will not be too bad

Personal experience, hope

Read more books, chemistry in junior high school is still quite simple. Do more questions, focusing on basic questions.

Pay attention to the phenomena, conditions, precautions of chemical reactions, etc.

Take more notes, listen more in class, and practice, this science subject is very special, you have to memorize more.

You also have to believe in yourself.

1.Keep in mind the chemical equations, principles.

2.Clarify the concept.

3.Pay attention to experiments (e.g. phenomena, conditions, error analysis, operating procedures, etc.) 4I believe you will be able to do well, in fact, the junior high school is very simple, don't think too complicated.

Hope, thank you!

1. Chemistry mainly first understands the principles, then combines experimental phenomena and chemical equations, diligent memorization, and then combines some typical exercises to strengthen understanding and memory, and then pays attention to the comparison, induction and sorting of knowledge points. In fact, the questions are quite common, grasp the equations and various calculation formulas, and memorize the properties of various substances.

2. It is inevitable to make mistakes in the learning process, whether you are careless or just not, you must habitually collect these wrong questions, and each subject has an independent set of mistakes, when we review before the exam, they are the key review objects, so since you miss once, you may not be wrong a second time, only in this way will you not lose points again on the same question.

3. Another key point of learning is efficiency, and only efficient learning can achieve half the result. I practice the "Elite Special Whole Brain Speed Reading and Memory Software" to stimulate the potential of the brain and improve the efficiency of learning and revision. Speed reading memory is an efficient learning and review method, and its training principle is to activate our "brain and eye" potential, cultivate us to directly convert the text symbols perceived by the visual organ into meaning, eliminate the potential pronunciation phenomenon in the mind, and cross the process from sound to understanding the meaning, forming an eye-brain direct reflection reading mode, and realizing the leap of reading speed, overall perception, comprehension and memory, and concentration.

4. Using software to practice, more than an hour a day, a month, can increase the reading speed by 5-10 times, and the memory and comprehension will also be improved accordingly, and finally improve the efficiency of learning and review, and achieve good results. In the past, many classes in our school carried out holiday speed reading shorthand training classes, using the elite special speed reading memory training system.

If you are a student who is busy preparing for the exam or a friend who wants to improve your ability, I recommend learning the "Elite Special Brain Speed Reading and Memory Software", which can improve memory and learning efficiency, and the Elite Speed Reading is also recognized by the Fast Reading and Memory Association. Persistence will be rewarded, I wish you success!

In my experience.

1.Commonly used element symbols to memorize.

2.The valency of the elements should be memorized.

3.Familiarize yourself with the reactions to commonly used tests.

4.Commonly used basic reactions need to be mastered.

5.Master the trim of chemistry.

6.Be able to do experiments.

That's basically it.

Listen more in class, understand more and ask more, don't ask any questions now, and it will be more difficult to understand in the future, take notes, summarize more, I want you to memorize what I want you to memorize, I am the easiest way, generally will not exceed this range.

The key is to be interested so that you can learn better.

I studied very well, and I also participated in the national chemistry Olympiad, so ask me any questions.

Good luck with your studies.

You can buy other chemistry exercises to do, and then look at the answers after doing them, and the answers should be analyzed, and I really won't ask my classmates properly

Find a college student studying chemical engineering to tutor. A lot of the time, you need the right way to communicate to understand what it means, in fact, chemistry is more interesting, it is more difficult to get started, and it is easier inside. I wish you success.

Don't be embarrassed. If you want to study hard, don't be embarrassed, hurry up and ask after class (*

If you want to learn a course well, you must first cultivate your interest before you have the motivation to learn.

The landlord may be more or less hindered by the pressure of the high school entrance examination, hehe.

Junior high school chemistry is a relatively elementary chemistry knowledge, mainly to lay a good foundation. In fact, the periodic table alone contains a lot of content, including the symbol of the element, the position in the periodic table, and then Qi Qiyan knows the electronic configuration of the element in combination with the law of electron configuration outside the nucleus, and is familiar with and understands the possible valence state of the ion of the element according to the law of the outermost electron gain and loss, and then the coefficient balancing is not a problem when writing the chemical equation later.

Also, in response to the exam-oriented teaching of high school education, it is very important to understand the knowledge in combination with the questions, and it is necessary to buy a reference book with many example questions and easy to explain properly! Look at the questions more and do more questions, think diligently, think clearly, do the right thing to explain that you have mastered, and if you are wrong, go back to the textbook knowledge to find the reason for the mistake. This facilitates the acquisition and consolidation of knowledge.

I'm also in junior high school, and our teachers are better, (Qingzhen speaks clearly, and speaks slowly) If your teacher speaks with a big tongue, then there is no way, but junior high school chemistry is simpler, and it is more rote memorization, so it would be good to do more exercises in the file book.

Junior high school chemistry focuses on laying the foundation The exam is not good because your basic knowledge is not firm enough to change the Qi sect You must be familiar with the basic knowledge and you can't be familiar with it anymore It's easy to say How do you do more? First of all, make up the basics, look at the books, and then do the type questions, remember, oh, the problem is to be fine, not to do more type questions, others do one, let's do a type of question, we must not know half of it, this will be counterproductive, half the result.

After you have mastered a certain amount of knowledge, you are learning to draw inferences, so that you have enough capital, and then you can do special training, do more questions, improve efficiency and quality, and do this step, the exam will be easy.

Listen to lectures + do exercises. Practice is especially important. Deepened memory. It's easy to do.

Conceptual knowledge should be understood and memorized, and then it is good to do more exercises in the textbook.

Listen to the lecture, the next thing is to memorize the work, many basic equations are to be memorized, and also, for the calculation problems in chemistry must be done correctly, in the fill-in-the-blank questions I think the more difficult is to write the reason, and there is interest, interest is the most important.

1 hydrogen atom is H, hydrogen molecule is H2, and it is -1 valence. Because the law of the outermost electron count is 2 8 8

The hydrogen atom is -1. It has to become 2 to be stable, so it is h2.

In this case, don't learn it first, you have to understand the basics first.

It is recommended that you go online and find some laws about the number of electrons in the outermost shell.

Keep in mind the most commonly used elemental valences.

The number and outermost electron number of those elements have a certain pattern with the valency, for example, hydrogen is 1, and the outermost electron number is 1. It is easy to lose electrons, the valency is -1, and there are many rules to follow in chemistry, so you can get twice the result with half the effort if you find it.

。。I seem to understand it.

h，o，c...It is represented by atoms. It is preceded by a number indicating the number of atoms.

h2，co2...It is a molecule and is made up of atoms. The small number in the lower right corner is the number of atoms in the molecule, e.g. 2 in h2 means 2 hydrogen atoms out of 1 hydrogen atom. The 2 in front of 2H2 indicates 2 hydrogen molecules. These are all non-metallics.

Metals are directly made up of atoms, e.g. potassium is k, and 3k means 3 potassium atoms. k denotes potassium element.

Valency: Mainly determined by the number of electrons in the outermost shell, there are also some non-valence elements, and the metal is 0 valence in the element. ,,There should be something in the book.。。

Good luck with your studies.

A compound formed by the combination of metallic and non-metallic elements, the metal is written on the front and the non-metal is written on the back. For example, aluminum oxide is Al2O3

Why is AL marked with 2 underneath?Because the valency of aluminum is positive3In the same way, oxygen is marked with 3 below because it has a valency of negative 2The algebraic sum of the valencies of the elements in the molecule is 0Positive 6 plus minus 6 and so on 0

For example, H2 can be said to be hydrogen, or hydrogen molecules. Hydrogen is made up of hydrogen molecules, not hydrogen atoms.

2 refers to the number of atoms. You could say that the hydrogen molecule is made up of 2 hydrogen atoms. 2h2 refers to 2 hydrogen, high school will say 2 moles (2mol), and the chemical equation is matched with the previous numbers, so that the number of elements on both sides of the equation is the same.

As for the numbers below, they are usually used to compare the relative atoms, molecular masses, and the masses of the actual items to find the required data.

It's a bit messy, it's better to take a look at inorganic chemistry in high school, valency is just an ideal inference, or a mark, jumping out to see chemical equations is the best way, don't be blindly commanded in it!

You focus on the elements, chemical formulas, chemical equations, combined with the cycle of chemical elements on the back of your watch to look carefully, even if you understand it in front, you should look at it with your heart as if you don't understand, three or five times, it's no problem to listen to the class.

You don't know so much that you can't tell what you don't understand.

Tell you a formula for valence: monovalent potassium, sodium, silver, hydrogen, chlorine (chlorine is negative 1 valence), bivalent calcium, magnesium, barium, zinc, oxygen (oxygen is negative 2 valence), di-trifer (positive valency), 24-carbon (positive valence), trialuminum, tetrasilicon, 5 nitrogen and phosphorus (generally positive), 246 sulfur are complete (-2 valence, +4 valence, +6 valence), copper and mercury bivalent is the most common (positive), other elements have valence, first die and then live to calculate (which means to write the formula well first, and calculate the valency of the required elements).

If you calculate the chemical equation, first write the required quantity, then the equation of the reaction, and then balance, then find out the mass of the substances known in the problem, calculate their relative molecular mass (the sum of the masses of all atoms), list the equation, and then solve it, and answer it (provided that you are familiar with the chemical equation). For example, if you know that there are grams of wood charcoal, how many grams of carbon dioxide can be produced if you add enough oxygen?

Solution: Suppose x grams of carbon dioxide are generated.

Ignite C+O2====CO2

xg12 44

xg solves: x=

Barely understandable.

It is recommended that you read the first chemistry book in the third year of junior high school carefully, after all, it is a new thing, and it is difficult to learn it well with a solid foundation.

If you can learn the basics well, you can basically study on your own later.

I'm a sophomore in high school, and this is.

I agree with the statement of the first floor: I have never heard of the knowledge of chemistry you said.

That's about what you're talking about.

The number in front of the letter, e.g. 3 in 3k, indicates the number of atoms or molecules (depending on the situation).

The number below the letter indicates the number of atoms.

Read the book a hundred times to see its meaning, read the book a few more times!

You don't have a foundation, and the foundation is actually to know from the beginning, which is not difficult. I suggest you read the book from the beginning to yourself, most students can learn it on their own, if they can't learn it themselves, then you have to ask a tutor. Because what you won't be is a large part of the content, not a problem.

H CO2 is knowledge of the meaning of chemical terms. The 2 in "h2" indicates that a hydrogen molecule is made up of two hydrogen atoms;

You don't grasp the meaning of chemical symbols, chemical equations are a skill that must be mastered. As long as the valency adds up to 0. The foundation is too poor, let's learn these first.

To give you a few examples: 2CO represents 2 CO molecules; k2+ (2+ on the top right) represents 2 potassium ions; 2O denotes 2 oxygen atoms.

You can read the book in the third year of junior high school for yourself, find out about that time, and then think about what is going on.