How to learn chemistry in the ninth grade, how to learn chemistry in the ninth grade to learn well

You have to endorse the precipitation after the first.

Acid-base salts Properties of acids:

Acid + base = salt + water Reaction conditions: None Reaction type: metathesis Example: H2SO4 (acid) + MG (OH) 2 (base) = MGSO4 (salt) + H2O (water).

Acid + salt = new acid + new salt Reaction conditions: There is gas or water or precipitation to form the reaction Reaction type metathesis example: HCL (acid) + Na2CO3 (salt) = H2CO3 (new acid) + NaCl (new salt).

But carbonic acid is unstable: H2CO3 = H2O+CO2 so that gas and water are formed.

Acid + Active Metal = Salt + Hydrogen Reaction Conditions: Metal is Active Metal Reaction Type: Displacement.

Example: 2HCl (acid) + Fe (active metal) = FeCl2 (salt) + H2 (hydrogen).

Acid + Metal Oxide = Salt + Water Reaction Condition: None Reaction Type: Metathesis.

Example: H2SO4 (acid) + Cuo (metal oxide) = CuSO4 (salt) + H2O (water).

Properties of alkalis: alkali + acids- (see properties of acids).

Alkali + salt = new alkali + new salt Reaction conditions: alkali and salt must be soluble in water, and there is precipitation generation (both meet at the same time).

Reaction Type: Metathesis.

Example: Ca(OH)2 (base) + K2CO3 (salt) = CaCO3 (new salt) + 2koh (new base).

Alkali + Non-metallic Oxide = Salt + Water Reaction conditions: Non-metallic oxides are acidic oxides Reaction type: ??

Example: Ca(OH)2 (base) + CO2 (non-metal oxide) = CaCO3 (salt) + H2O (water).

This reaction is used to identify CO2

Properties of salt: salt + acid - (see properties of acid).

Salt + alkali - (see properties of alkali).

Salt + salt = new salt + new salt Reaction conditions: Salt must be soluble in water, and there is precipitation in the product (both are satisfied).

Reaction Type: Metathesis.

Example: CuSO4 (salt) + BA(OH)2 (salt) = Cu(OH)2 (new salt) + BASO4 (new salt).

This is a double precipitate reaction, and of course only one precipitate is fine.

Salt + some metals = new salt + new metal Reaction conditions: salt can be dissolved in water, and the activity of metals is greater than that in salt (both are satisfied at the same time) Reaction type: metathesis.

Example: CuSO4 (salt) + Fe (metal) = FeSO4 (new salt) + Cu (new metal).

Remember all the equations, the high school entrance examination only tests the first twenty of the element cycle, so you have to roughly know their properties and laws, and you don't have to memorize the relative quality table, I think your teacher said that the high school entrance examination will be given in the middle school entrance examination.

Familiarize yourself with common question types.

If you don't know, you can always ask me.

Because I was a high school chemistry teacher.

After memorizing the equations, the top 30 of the elemental period, and the relative mass table, it is no problem to review the content of the book twice and above 90 points.

It's useless to just read a book, you have to borrow notes to read.

I've had a personal experience with the full back.

For Grade 9 chemistry learning, there are many ways to help students better grasp the knowledge points. Here are some suggestions:

1.Memorize basic concepts.

Chemistry is a very conceptual subject, so you need to grasp the basic concepts first. Students should take the time to memorize basic concepts such as the periodic table of chemical elements, the names of ions, and chemical equations so that they can better understand and apply them in subsequent studies.

2.Do a good job of lab classes.

Chemistry experiments are an important part of chemistry learning. Students should actively participate in the experimental class, carefully observe the experimental phenomena, and understand the experimental results. During the experiment, students can deepen their understanding of chemical experiments and improve their experimental skills at the same time.

3.Do more exercises.

Once you have mastered the basic concepts, you need to test your mastery through a large number of exercises. Grade 9 chemistry exercises usually involve basic chemical equations, properties of matter, types of reactions, and other knowledge points. Students should do more practice questions to improve their chemical thinking skills.

4.Master the scientific method.

Chemistry is an experimental science, so students should master the scientific method. In the process of learning chemistry, students need to learn to ask questions, formulate hypotheses, design experiments, collect data, and analyze conclusions. Through practice and **, students can better understand and master the knowledge of chemistry.

5.Do more extended reading.

Chemistry is an ever-evolving discipline, and students should read more news, articles, and popular science books on chemistry to understand the latest scientific advances and applications. At the same time, students can also broaden their horizons through extended reading to better understand chemistry knowledge.

In the process of learning chemistry, students need to master the knowledge points, and at the same time, they need to pay attention to practice and expansion. Only through continuous practice and learning can you achieve good results in the subject of chemistry.

Although chemistry is a science subject, it is also biased towards the liberal arts. I have seen chemical equations, concepts, element symbols and relative atomic weights in books or problems, and the physical and chemical properties of representative substances must be memorized. You can't do it without knowledge.

Therefore, if you want to prepare, you should memorize the first 20 elements first, and read the whole book first to understand a rough idea. (I don't know what textbook you use).

Then there is the proficiency of the exercises, which depends on doing the problems. If your teacher assigns more homework, you don't have to do many questions, and you can complete the homework with quality and efficiency. Don't compare answers with classmates, don't look at the concepts and do homework (memorize concepts and the like before doing homework), be sure to get stuck in time when doing homework, and don't spend a lot of time just trying to do the homework perfectly.

The perfect assignment will make you fail the exam! Just take it seriously.

Chemistry in the third year of junior high school is relatively simple. I believe that you will definitely become a skilled worker after studying hard.

Chemistry in the third year of junior high school is not bad, and if you learn it well, it will help you a lot in high school. In my experience, I first have to memorize the first 20 elements from order to relative mass. There is also the order of metal mobility; Then it is necessary to memorize the reaction formulas and phenomena, it is best to draw inferences, the same law can be applied to other substances, this is the type of reaction; Experimental questions and inference questions test whether you are usually careful and whether your thinking is rigorous, and the teacher will analyze them with you one by one.

The most important thing is whether you understand what you want to memorize, you have to understand the laws between substances, you have to start from inorganic and organic substances, you have to know the meaning of valence, and you know how to react through the gains and losses of outermost electrons. Repeat this knowledge over and over again, and one day you will find yourself suddenly enlightened.

Don't rely on books, books just tell the most basic things, and accumulate experience in doing problems.

The classic question type is never tired of being tested.

Is 9th grade the third year of junior high school? Chemistry still has to memorize, remember the properties of ion groups, memorize experimental operations, memorize reaction phenomena, and mainly do more memorized.

Basic knowledge is very important After mastering the basic knowledge, focus on the key points and do the questions, and finally do the questions by question type Special training is very important.

In understanding the process of material change: chemical change, physical change definition; Classification and definition of substances: pure substances, mixtures; Definition of Classification of Pure Substances:

elemental, compound; the name (including common name) and writing of the chemical formula; Relative atomic mass, relative molecular mass, calculation of valency of each element in the chemical formula, calculation of the mass fraction of each element in the molecule, ratio of the number of atoms in the molecule, mass ratio of each element, calculation of the mass fraction of an element, writing of chemical equations and related calculations and other basic definitions. Understand the physical and chemical properties of each substance, the preparation method (laboratory, industry), and the use in daily life; Precautions for the three phases of each experiment: before, during, and after each experiment. A deep understanding of chemistry is a science that always pays attention to the prevention and control of environmental pollution.

If you can memorize the above definitions, principles and subtle knowledge points of related substances, it is still very easy to score 100 points and get 80+. The main thing to remember is that if you are afraid of getting tired, then give up quickly and find a master to learn a skill, no one can succeed without hard work, and behind genius is often a cruel world that few people know.

Chemistry is a liberal arts, not to a certain extent, memorizing more knowledge points, practicing more, just learning a solid point.

Chemistry in the third year of junior high school is actually very easy. On the contrary, high school is more difficult. When I was in junior high school, I was not good at chemistry, but I gradually realized that it was because I was not suitable for a subject that I had never received before.

First of all, as an introductory subject for the third year of junior high school, you must know the general meaning of chemistry. In fact, chemistry in the third year of junior high school is biased towards liberal arts.

The first is to lay a solid foundation. It is necessary to memorize the concepts in the book (you can list them on a blank piece of paper), and focus on the understanding of the elements and the properties of each substance (such as acidity and alkalinity), as well as the concepts in the book.

After understanding the principle, then use a blank piece of paper to write down all the equations involved, (refer to the teaching materials), one by one, until you have mastered it completely.

And then there's the experiment. Then use a blank sheet of paper to list all the experiments, which require equipment, principles and phenomena, and reaction equations.

After doing these, basically your foundation has been solidified, it is recommended that you buy a five-year mid-year exam three-year simulation of chemistry, very good and targeted, one type of question type and one type of question, each choose several typical topics to broaden your thinking. If you look at the light of the questions, your ability will definitely be greatly strengthened. Come on!

If it's junior high school.

Just understand the basics, there are few equations, and there are rules. It would be nice to do more questions. It's easier.

The formula does not need to be memorized, and the experiment is simulated in the brain to enhance the strong interest in chemistry. Among them, the in-brain simulation experiment steps can play a significant role in the exam, and many points can be added.

First of all, it is necessary to memorize the first 20 elements of the periodic table and be clear about the proton numbers of some commonly used chemical elements, etc. Then, memorize some of the most commonly used chemical formulas and balance them. Also, for some chemical reactions, keep in mind.

I think that if you memorize all this, chemistry is not difficult to learn.

Grade 9 chemistry is the beginning of chemistry, so there are more memory contents in the first volume, and the important memory content is these two tables, the table of commonly used element symbols, the commonly used valence table, and the two types of gas preparation methods. The first solid-liquid reaction does not heat up. There is a solid reaction that needs to be heated.

There are three gas collection methods, upward air exhaust method, downward air exhaust method, and drainage method. The properties of two gases: oxygen and carbon dioxide. In terms of the composition of matter, molecules, atoms, ions and elements are defined.

Classification of substances focuses on distinguishing compounds and mixtures. Remember the chemical reaction phenomena of common reactions. An equation chemical equation.

The so-called new substance is a substance that is different from the reactants, such as magnesium reacts in the air, the substances before the reaction are magnesium and oxygen in the air, and the magnesium oxide generated is not produced before the reaction and is produced in the reaction process, the magnesium oxide is a new substance, so the new substance refers to the substance produced in the reaction process, which is not available before the reaction.

Chemistry is easy, math is difficult, and physical formulas are inexhaustible. Chemistry knowledge is relatively fragmented, and you need to memorize it, from the element symbols, the properties of the elements, the periodic table, the equations of chemical reactions, etc.

Chemistry is easy to learn, but it is not easy to accept chemistry in ordinary habits, chemistry is a summary of experimental science, some things are accepted, but not mathematics, physics and reasoning.

Study seriously, junior high school chemistry is relatively simple, interesting, and I like to do experiments the most.