Is 9th grade chemistry difficult, what to do if 9th grade chemistry is difficult to understand

It's not difficult, as long as you read more books, use your brain more, and do more exercises. There are not many chemical equations involved in the ninth grade chemistry book, and the exams mainly focus on oxygen, hydrogen, carbon dioxide, acids, alkalis, and salts. If you are willing to work hard, your foundation will be strengthened here, and you will be able to understand it by yourself in high school.

Then there are the experiments in the book, if you can memorize them, then the exam will be easy for you.

It's not difficult, the elementary chemistry is very simple, but there are many things and many rules that need to be memorized, as long as you summarize the rules well!

I want to say the front, it's the eighth grade, right? Mechanics is hard? It's hard to learn electricity, okay!! Grade 9 chemistry is actually okay, let's just say that the calculation of chemical equations is a bit difficult to understand, and it is too simple compared to high school compared to junior high school!!

It is mainly comprehensible knowledge, which does not require too much thinking, just understand the principle, and be familiar with the chemical experiments in the textbook, to know the principles of chemical reactions, the instruments and uses of chemical experiments, and the steps of chemical experiments, as well as reaction phenomena, these are the directions of the exam propositions.

It is not difficult, the third year of chemistry is mainly based on understanding chemistry and basic experimental operations.

Turn. Chemistry in the third year of junior high school is actually not difficult, it is just a basic introduction to the subject of chemistry. The focus of knowledge is limited. To learn chemistry well in junior high school, you must master the following points.

1.Master the principles of the four basic reactions and their representative reactions. That is, chemical reactions, decomposition reactions, displacement reactions and metathesis reactions.

2.Master the basic process of the following tests: laboratory oxygen, laboratory hydrogen, laboratory carbon dioxide, and acid universality.

3.The basic properties of acids and bases are summarized.

4.Learn to balance chemical equations and be able to do basic calculations.

5.Be sure to listen carefully and take good notes in class. That's the key.

6.Do more practice questions, practice makes perfect?

This is how chemistry went from bad to good when I was in the third year of junior high school. Hope you succeed too.

I don't agree to blindly memorize it, because if you study science as a liberal arts, and in the future, when you go to high school, it will be difficult for you to learn the rational analytical thinking of high school chemistry. I think you should take a long-term view and lay the foundation for your high school studies.

In the study of chemistry in junior high school, the basic knowledge may need to be memorized first, but if you can use these abstract concepts to help you learn, you will deepen your understanding of the knowledge and gradually know the application of this concept. For example: Can you illustrate the difference between an element and an atom with a living example?

I teach, I never force students to memorize anything, I just use examples from life to help them understand, I am not afraid of students making mistakes, I hope they can realize where they don't know enough. The sea of questions is huge, and the essence of it is that the books are basically packaged.

Chemistry is more trivial, as long as you connect with life to learn, you will find feelings, not helplessness.

1. It may not be easy to adapt at first, but it will be fine after a while, of course, on the premise of studying hard. Chemistry has always been known as the liberal arts of science, and there are many things to understand, and there are also many things to memorize, and it takes a lot of effort.

3. Make more summaries by yourself, summarize the number of knowledge points and learning methods and skills.

4. If you can't, you can ask the teacher more, and the teacher will give you a lot of help.

Chemistry in junior high school is not difficult to learn. For students in many areas, the first time chemistry in school is in the third year of junior high school, and the chemistry at this time is some relatively basic and introductory things.

Chemistry and Physics are two courses of similar difficulty in junior high school as a whole, and both have corresponding learning methods. When learning chemistry, you can learn chemistry better by memorizing various chemical formulas, chemical reaction equations, etc.

The embryonic period of chemistry

From ancient times to 1500 B.C., human beings learned to make pottery from clay in a blazing fire, to burn metal from ore, to make wine from grain, and to dye silk and linen and other fabrics.

In ancient times, primitive humans discovered and used fire in the struggle against various disasters in the natural world for their survival. Primitive human beings began to use fire from the time of barbarism to civilization, and at the same time, they also began to use chemical methods to understand and transform natural substances. Combustion is a chemical phenomenon.

The discovery and use of fire improved the conditions for human existence and made the human race smart and powerful. ）

1.The percentage content of copper sulfate is (the atomic weight of copper is calculated as 64) (16*4) (16*4+64+32)=64 160=40%, assuming that the mass of xg of copper sulfate (CuSO4) contains 32 grams of oxygen, there is x*40%=32

Get x = 80g

That is, copper sulfate (CuSO4) with a mass of 80g contains 32 grams of oxygen element 2The mass fraction of nitrogen in urea CO(NH2)2 (14*2) [12+16+(14+1*2)*2] = approximately equal) ammonium sulfate (NH4)2SO4 in the mass fraction of nitrogen (14*2) [(14+1*4)*2+32+16*4]=approximately equal) Assuming that the nitrogen content of y tons of ammonium sulfate is equal to the nitrogen content of 1 ton of urea, there is y*

We get y=approximately equal to)

That is, the nitrogen content of one ton of ammonium sulfate is equal to the nitrogen content of one ton of urea.

This question is very simple, and the identification is complete. Do it yourself, it's easy.

1 32g/(64/160)=80g

The mass fraction of nitrogen in 2 CO(NH2)2 28 60*100%=(NH4)2SO4 28 132*100%=1t*

The nitrogen content of one ton of ammonium sulfate is equal to the nitrogen content of 1 ton of urea.