What do you learn in junior high school chemistry? How to learn chemistry in junior high school and

It's all very simple things, as long as you are willing to remember, don't look at the simple but this stage is very critical, directly related to your high school chemistry, so you have to study hard, I am now a sophomore in high school, junior high school chemistry is very good, and now it is infinitely easy.

Other people's answers are so long! It just so happens that I am also in my third year of junior high school this year (* There is nothing difficult in chemistry, only by memorizing the valence of the chemical valence, it is easy to say anything, the equation of chemical reaction does not need to be taken care of at all, as long as the valence of the chemical valence will be easy to do.

The most important thing is Chapter 7, listen carefully in class.

Junior high school chemistry is very simple, as long as you memorize the reaction equation-level reaction phenomena and do more experimental problems. Trust me, I've just graduated!

Valence refers to valence, which is the number of electrons that an element appears in its atomic state. In junior high school, you don't need to know what it is, just remember the common valence states of common elements. I'll give you a good idea.

Monovalent: Hydrogen H Chloride Cl Sodium Na Potassium K Silver AG Chlorine is (-1) valence, others are (+1) valence.

Bivalent: Oxygen O Magnesium mg Calcium Ca Copper Cu Barium Ba Zinc Zn Oxygen is (-2) valence, others are (+2) valence.

Al-AL is positive three (+3) and never changes.

This is enough for the high school entrance examination, and your teacher should have given it.

Teach you the simplest, silliest, and most useful way to memorize more points, especially junior high school chemistry! The ones you say need to be memorized no matter what the method is, and all the books have it! In one is to practice more! The clumsy bird flies first! I hope you will have good grades in the future!

Knowledge of elemental valence, oxygen properties, water properties, the law of conservation of mass and the calculation according to the law of conservation of mass, four basic reactions: chemical reaction, decomposition reaction, displacement reaction, metathesis reaction,

You have to explain where you are and what kind of teaching materials you use.

What is tested in the exam...

We can explain it.

Learn about substances, including its classification: mixtures, elementals, etc., others are derived from substances (if you want to learn the equation well, you must remember the valency, which is a must), learn the others well, you have to memorize the first 20 of the solubility table and the periodic table, and then the teacher will divide the next categories (* hee-hee-hee......Speaking of experience, in addition, some chemical formulas do not need to be memorized at all, just master the skills.

First know chemistry, understand the writing of chemical formulas, etc. The focus is on the writing of equations and the mastery of several major reaction types. I think the difficulty lies in the acid-base salts.

1. Be diligent in previewing, good at listening to lectures and taking notes.

If you want to learn chemistry well, you must first understand this course. Be sure to preview before class, in addition to reading the content of the new lesson carefully, you should also mark the areas you don't understand, and try to do the exercises in the textbook. In this way, with questions and difficulties, the efficiency of listening to the class will be greatly improved.

There is a lot of chemistry content in junior high school, and the knowledge is relatively scattered, so teachers focus on the key content when lecturing. Therefore, everyone should listen carefully to the lecture and take notes carefully, which is not only conducive to reviewing after class and mastering the key points, but also can effectively prevent "distraction" during class. However, when taking notes, on the basis of listening to what the teacher says, you should remember the key points, difficult points, doubts, and things that are not in the textbook.

2. Review often and memorize more.

After class, you should review in time and do your homework carefully, which is an important part of learning chemistry well. Revision can be done after class, after week, unit, chapter, and comprehensive. Methods of revision include retelling, dictation, and making connections.

Knowledge can only be firmly grasped through multiple revisions. There are a number of basic concepts and principles in the current junior high school chemistry textbooks, and the element symbols that are required to be mastered.

There are more than twenty, and many chemical formulas and chemical equations.

and a few other knowledge. Most of these contents need to be memorized on the basis of understanding, and most of them are the basis for learning chemistry, and if you can't memorize them, you will find it difficult to walk in the "kingdom of chemistry". It is important to keep in mind the terms and definitions of chemistry and to distinguish them carefully, such as chemical compounds and pure substances.

Elemental substance, mixture, their definitions should not only be remembered, but also differentiated and compared, and the words in the definition should be deducted, and who includes everyone must be clarified. Once you really figure it out, then I ask you which substance milk is above and you won't have to think about it for a long time. Common chemical reactions.

It must be kept in mind, to be able to write silently, the conditions (heating, light, catalyst, arrows are reversible, irreversible need to be paid attention to, the phenomenon of the reaction process is needless to say, the important ones must be remembered. Formulas in chemistry are like memorizing mathematical formulas.

Understand it that way, remember to use it flexibly, and be flexible Don't be a nerd, I don't like nerds either.

3. Thoroughly understand the textbook and connect it with reality.

Taking the textbook as the main line and carefully reading the textbook is the foundation of learning chemistry well. To this end, students must be good at reading textbooks, pre-reading before class, careful reading after class, and frequent reading. It not only pays attention to the main content, but also does not ignore the small print part, some charts, information and optional content.

The content of chemistry in middle school is closely related to life and production. This requires us to learn chemistry at the same time, we should try to connect with the reality of production and life, discover chemistry from the life around us, and taste chemistry, so that the more we learn, the more we want to learn, the more we love to learn.

Fourth, pay attention to experiments and cultivate interests.

Chemistry is an experiment-based discipline, we must carefully and meticulously observe the teacher's demonstration experiments, conscientiously do a good job in each group experiment, and must be clear and familiar with the instruments, drugs, devices, experimental principles, steps, phenomena and precautions used in the experiment.

5. Studying chemistry.

1 7 step by step reading.

Build your confidence, junior high school chemistry is not difficult, I once saw a girl in our class through hard work, chemistry in the class.

Read books diligently, especially the basics, and repeat memory is king.

Acquire appropriate problem-solving skills, especially those that are often emphasized by the teacher.

Do more questions, summarize more, I will reflect on my body three times a day, or repeating the memory of that sentence is the king.

Ask the teacher more, it is not recommended to ask classmates, it is easy to take you into the ditch.

Integrating chemical knowledge into daily life, the activities of all things in the world are believed to have chemical reactions.

If you have learned the knowledge, don't hesitate to teach your classmates, you can output, it means that you have really mastered it.

If you want to learn junior high school chemistry well, there are four points to pay attention to:

1. Be diligent in previewing, be good at listening to lectures and taking notes, and try to do an after-class exercise.

2. Review often, memorize more, review in time after class, and do homework seriously.

3. Thoroughly understand the textbook, connect with the reality, and carefully read the textbook with the textbook as the main line.

4. Pay attention to experiments, cultivate interest, and carefully observe the teacher's demonstration experiments.

1. Be diligent in previewing, be good at listening to lectures and taking notes, and try to do an after-class exercise.

2. Review often, memorize more, review in time after class, and do homework seriously.

3. Thoroughly understand the textbook, connect with the reality, and carefully read the textbook with the textbook as the main line.

4. Pay attention to experiments, cultivate interest, and carefully observe the teacher's demonstration experiments.

I think junior high school chemistry is still very easy to learn, as long as you can memorize the equations and memorize them. It's not that hard.

Junior high school chemistry is really not difficult, just those few reaction principles, and experimental phenomena, just memorize it, it's really nothing, the landlord doesn't have to worry so much, don't be too anxious, it's really not good, find a teacher to make up the class, just learn to understand? It's okay.

Observe more, watch experiments, remember key phenomena, understand the composition and changes of matter, and remember more.

Junior high school chemistry is the introduction to chemistry, the knowledge learned is very simple, and there are calculations, but the calculation data is not too difficult, the important thing is to memorize more, remember a lot of knowledge points, and there is no problem.

This friend, you have to understand the importance of learning, we will become better, there is a saying that is very good called "the book mountain has a road for the path, the sea of learning is endless", hinting at the importance of learning, learning is our foundation for the future, constantly enrich and improve themselves, learn more knowledge, we can live a better life, isn't it?

?pwd=dj8j extraction code: dj8j euseido junior high school chemistry|Chemistry High School Entrance Examination Total Review|Chemistry Nine Down|Chemistry Nine |Lecture 9: The Composition of Atoms|Lecture 8 Molecules and Atoms|Lecture 7 "The Air Around Us" Whole Chapter Review and Consolidation (Improvement)|Lecture 7 "The Air Around Us" Chapter Review and Consolidation (Basic)|Lecture 6: Oxygen Production (Improvement)|Lecture 6: Oxygen Production (Basics)|Lecture 5: Properties of Oxygen (Improvement)|Lecture 5: Properties of Oxygen (Basics)|Part 4: Determination of Air Composition and Oxygen Content (Improvement)|Lecture 4: Determination of Air Composition and Oxygen Content (Basics)|Lecture 3: Review and consolidate the whole chapter of "Into the World of Chemistry".

At the beginning, there is a composition of air, talking about oxygen, carbon oxide, and the properties of water, and then the third chapter is to explore the mysteries of the composition of matter: understand what particles are, the basic particles that make up matter, the chemical elements that make up matter, and the representation of the composition of matter (this chapter is the focus) Chapter 4 talks about combustion and fuel, mainly to achieve the three elements of combustion (there is oxygen, it is combustible, (the temperature reaches the ignition point of combustibles), and then there is a section to understand the use of chemical fuels, simple. The last chapter is Metals and Minerals, 1

Let's first know the chemical properties of some common metals2Know the chemical process of ironmaking (important) 3The protection of metal and **, and finally the use of limestone (to read more books) is completed.

If you are in the third year of junior high school, I hope to memorize notes before going to bed in chemistry, the basic knowledge of chemistry is very important, and the 20 multiple-choice questions in the high school entrance examination will depend on the basic knowledge, either all of them will get a full score of 40 points, or at most one will be wrong. Bless you teenager - a senior who has just graduated.

Unit 1 Entering the world of chemistry.

Topic 1: Changes and properties of matter.

Topic 2 Chemistry is an experiment-based science.

Topic 3 Walk into the chemistry laboratory.

Unit 2 The air around us.

Issue 1: Air.

Issue 2 Oxygen.

Issue 3: Oxygen production.

Unit 3 Water in Nature.

Topic 1: Composition of water.

Topic 2: Molecules and atoms.

Issue 3: Water purification.

Issue 4: Caring for water resources.

Expansive Topics The lightest gas.

Unit 4 The Mystery of the Composition of Matter.

Issue 1: Composition of atoms.

Topic 2 Elements.

Issue 3: Ions.

Topic 4 Chemical formulas and valencies.

Unit 5 Chemical Equations.

Topic 1: The Law of Conservation of Mass.

Topic 2: How to write chemical equations correctly.

Topic 3: Simple calculations using chemical equations.

Unit 6 Carbon and Carbon Oxides.

Topic 1 Diamond, graphite and C60

Issue 2: Research on carbon dioxide production.

Issue 3 Carbon dioxide and carbon monoxide.

Unit 7 Fuel and its utilization.

Issue 1: Combustion and extinguishing of fires.

Issue 2 Fuel and heat.

Issue 3: Environmental impact of fuel use.

Expansive Topics: Comprehensive utilization of oil and coal.

Unit 8 Metals and Metal Materials.

Issue 1: Metallic materials.

Issue 2: Chemical properties of metals.

Issue 3: Utilization and protection of metal resources.

Unit 9 Solution.

Topic 1 Solution formation.

Issue 2 Solubility.

Topic 3 Mass fraction of solutes.

Unit 10 Acids and Bases.

Topic 1: Common acids and bases.

Issue 2: What happens to acids and bases?

Unit 11 Salt and Fertilizer.

Topic 1: Salt that is common in daily life.

Issue 2: Chemical fertilizers.

Unit 12 Chemistry and Life.

Issue 1: Important nutrients for human beings.

Topic 2: Chemical Elements and Human Health.

Issue 3: Organic Synthetic Materials.