Learning chemistry well depends on whether you know the "basic structure" and "arrangement" of chemistry textbooks. 1. I wonder if you have the habit of previewing. If not, I suggest that you should form this habit.
Because when learning chemistry, if the framework is formed in the brain in advance, the knowledge of chemistry will be stronger under the guidance of the teacher. After preview, the best state is to really understand the "basic structure" of this section, that is, you can instinctively describe the knowledge points of this section by closing the book.
After previewing, I usually do the questions in this section. Although you can't do it at first, you can learn some knowledge points that are not in the book, thus forming a habit of summarizing the methods and laws of doing problems. 2. You can learn chemistry well without class. If our class is good at chemistry, you really don't listen carefully, but it doesn't mean you don't have to attend class. After mastering what the teacher said, you can find your own questions to do. Of course, you should always pay attention to whether the knowledge the teacher said is mastered by yourself. For students with poor foundation, you should listen carefully. You didn't hear "1+ 1=2". That's why "1+ 1=2" really understands the questioner's purpose. Students who didn't learn well in junior high school have suffered too much, and those who haven't made progress have the opportunity to make up for it, but those with poor foundation in senior high school have suffered too much. Because doing chemistry problems is not only to make sure that you are right, but also to make sure that the speed of doing them is quite good, which is for yourself. When doing the problems of volume and mass, besides our usual proportional method, we also need to use limit method, cross method, equation method and so on. These methods will be touched by teachers in junior high school, which means that learning lies in accumulation. However, if you are not agile enough, it will affect chemistry learning, and you will hesitate to do the problem, leading to confusion of thinking. Therefore, only when solving problems, the accumulation method is more important and the conclusion. 3. Chemical knowledge can be reduced to basic concepts. No matter which subject it is, it has a lot to do with Chinese. As long as it is a sentence, every component of it has its function. Mastering the basics depends on whether you really recite the concepts word by word. 4. Ask less and think more. I don't think that good questions in "Be diligent and ask questions" are always good, it will only make your thinking narrower. Unless you really don't understand what you haven't touched, you can't escape what you have learned, not just because you didn't expect it or didn't learn the basic knowledge well. Independent thinking, not relying too much on the help of teachers and classmates, is a good way to tap the potential of learning chemistry. However, learning chemistry still depends on your own efforts. Chemistry is alive, don't underestimate its existence, otherwise you can only bow your head in front of chemistry. Chemistry and our life students often study it.
To learn chemistry well, we must fully understand the importance of this course. As a basic theoretical discipline, chemistry is closely related to people's lives. Human life, whether it is clothing, food, shelter, transportation, use or our living environment, contains extremely rich chemical knowledge.
In terms of clothes, the fabrics of clothes are all made of fibers. Natural fibers in nature mainly include fibers composed of animal and plant cellulose. Although they can only be used in textiles through simple physical processing, the number of natural fibers that nature can provide is limited, which is why leather clothes are more expensive.
Most of the fibers used by human beings for clothing fabrics are chemically treated fibers, that is, chemical fibers. Chemical fibers are divided into man-made fibers and synthetic fibers.
Protein is dissolved in chemicals, processed into mucus, and then spun into slender fibers, that is, artificial fibers; Using coal, petroleum and natural gas as raw materials, polymer organic compounds are made by chemical synthesis, and then synthetic fibers are made by spinning. In fact, whether in the preparation of raw materials for clothes, the dyeing of fabrics or the washing of clothes, we must deal with chemistry.
Do students know that it contains so much chemical knowledge? As the saying goes, "Food is the most important thing for the people". In order to maintain life and maintain abundant energy to participate in study and work, people have to eat every day. Everyone wants to eat well and live a long and healthy life.
However, experience has proved that only proper diet can ensure adequate nutrition, while improper diet will affect health and even cause diseases. So, what should we eat? What are the ingredients and nutrition of various foods? How to match food to ensure adequate nutrition? To answer these questions, it is necessary to accumulate relevant chemical knowledge extensively.
Take vitamins for example. Although they are rare in living things, there are many kinds in living things. Among them, vitamins A, B 1, B2, C, D and anti-furuncle vitamins are particularly important to human body. They are mainly used to regulate the normal physiological functions of animals, promote the metabolic process, and play an important role in maintaining health and preventing diseases. They are biologically called active substances and are very important. As we know, vitamin C is an auxiliary medicine for chronic diseases, and vitamin D can promote the absorption of calcium by human body. Infants with calcium deficiency often inject vitamin D. ..
Food, especially vegetables and fruits, is rich in vitamins. As long as you don't have a partial eclipse, eating vegetables and fruits often can meet the vitamins needed by the human body. Of course, there are still many problems that have not been clarified, especially the pharmacology of drugs, which requires more students to devote themselves to the cause of chemistry for in-depth research.
With the improvement of people's living standards, people should not only eat well, wear well, but also live well. The building materials and decorative materials used in houses inhabited by human beings are chemically divided into two categories: inorganic materials and organic materials.
For example, cement is the most used building material in construction sites. It is a kind of hydraulic cementing material, which can coagulate and harden in air and water. Before liberation, China's chemical industry was backward, mainly relying on imports. At that time, cement was called "cement"
At present, China can produce more than 50 kinds of cement from different places, ranking the top three in the world in annual output. The production of cement includes a chemical process, which is roughly divided into three steps. First, mix limestone.
2. Ask for a chemical paper, the journey of water molecules.
Although people can't see me, I can still be regarded as the first in the micro-world, with a "fat head" and two "big ears" I am a famous water molecule in the Jianghu. On a hot summer afternoon, all the creatures bowed their heads in the heat. Only we can't stand it on the lake, so we say it's cool and want to go there for the summer. So, I followed a hot air, opened the distance with my companions, and ran to the sky quickly and freely! This is really a relief. When we had a good time, we had a bird's eye view of the following blessings: the Yangtze River, the Great Wall, Huangshan Mountain, the Yellow River and Mount Everest. And Taklimakan. . . How beautiful I am! Before I knew it, I felt cold all over. It turned out that we came to the sky and had to roll around with our companions again, but it was still so cold that everyone began to cry. They all missed the underground time and jumped down one after another, but were washed into the sky by the thick airflow, so we had to scout the terrain first. Oh, isn't that Huangshan Mountain? That place should be easy to jump, so more partners hugged and finally jumped down.
I thought I could stay in Huangshan Mountain quietly, but the gravity of the earth never let me go. Finally, it flowed to Shenzhen and was put into Mr. Tang's water electrolyzer. Suddenly, I felt numb, and my "fat head" and "big ears" were forced to separate. After that, I was gone. My soul looks for my "fat head" and "big ears" in heaven.
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3. Sentence chemistry in chemical writing is a subject that studies the structure, composition, properties and changing laws of matter.
Chemistry is everywhere in life, and 20% of the world's patent inventions are related to chemistry; Among the scientific and technological personnel engaged in research and development in developed countries, chemistry and chemical experts account for about half; It's what we have to take in the mid-term exam. It is difficult to learn it well, but it is simple. To learn chemistry, we must first understand chemistry and cultivate our interest in chemistry. With fun, learning chemistry is no longer a difficult task.
Chemistry is a subject based on experiments, so we can often come into contact with many interesting experiments in chemistry class, but the beauty of chemistry is not only here. If you are really addicted to chemistry, you can't help thinking in chemistry.
For example, when a mineral water is found in a certain place, the first thing that businessmen think of is how to make money; The first thing that comes to mind when studying geography is which rock layer mineral water comes from; Biologists think about what kind of bacteria are in mineral water; What chemists think is what special elements are in it; It is common to pour boiling water. If you have a chemical subconscious, you will turn the piston upside down when you pour boiling water. People who study chemistry may lack romance. For example, when they see a bonfire, the poet can't help but write down a famous sentence through the ages. You may coldly leave a sentence: This is just a violent oxidation reaction. But chemistry will not lack enthusiasm. When you have this passion for chemistry, when using chemistry becomes a habit, you should position chemistry not only in your study, but in your life.
At that time, you will find chemistry so interesting. After you have interest, you have to have a method.
I think learning chemistry is very simple. First of all, we should recite all our lessons. After memorizing, do more questions. The key to doing the problem is to master the skills. Mastering one problem-solving method is more useful than doing a hundred problems. No, it won't. Ask more questions. I have studied chemistry for a year. After studying chemistry, I feel small. There are so many things I don't know, but chemistry is really an interesting subject. I don't know if you feel this way.
4. How to study chemistry composition 8? Chemistry is one thing plus another, and it becomes a new thing with a bang.
When I was young, my mother told me so. At that time, I thought chemistry was not a very, very fun thing. Chemical chemistry, ever-changing knowledge.
Close your eyes, the blue sky, green Yuan Ye, flowing water, white snow and black charcoal are all colorful. Yes, chemistry is not far away from us. Chemistry is all around us.
As long as you look hard, you will find a chemical dome, which is full of endless fun. When it comes to chemistry, many students, especially those in our key middle schools, often feel headache, saying that it is not easy to learn. Some people even call chemistry "the liberal arts in science", which shows that it is difficult to learn chemistry from one side, and it is very different from the learning method of mathematical physics.
That's true. Learning mathematics and physics is mainly to understand the basic definitions, theorems, laws and so on. After mastering these basic things, we should do a certain amount of practice, consolidate the established ideas and deepen them continuously, and finally we can skillfully use what we have learned and solve various problems flexibly. Chemistry is different, because chemistry is a subject based on experiments, and inevitably there will be more narrative words.
In addition, knowledge is not systematic, and experiments play an important role in the whole learning process, so chemistry is different from learning mathematics and physics. When I was studying chemistry myself, I realized that to learn chemistry well, we must first understand the subject of chemistry, and we must know that chemistry is closely related to our lives and plays a very important role.
For example, paint, food, medicine and daily necessities in life are inseparable from chemistry. Knowing this, you will have a certain purpose, interest and a good start when you study.
If you look at our textbooks yourself, you will find that many things in the textbooks actually come from our daily life. We talked a lot about chemical phenomena in our lives.
For example, it tells us that the candles we usually use for lighting will form water and carbon dioxide after burning, which makes us know that some substances can be "changed" into other substances. The book mentions that iron rusts, so we naturally ask why iron rusts. What is rust? Learning with questions in this way will make us interested in learning and learn more solidly.
Secondly, I realized that to learn chemistry well, we must pay close attention to the foundation. Many students pay little attention to basic knowledge.
You think the basic things need to be known and understood. But I personally realize that to learn chemistry well, we must lay a good foundation.
Grasping the foundation cannot be overemphasized. I have a deep understanding of this.
When I first rose. I took part in the school's Olympic trials and was selected to train in the chemistry competition class.
At that time, the courses were very tight. I talked about some of them in three days, and finished most of the senior high school chemistry courses in less than a month. Then in the later study, it took me about a year to complete all the chemistry courses in the university. The training course adopts the natural elimination system. In the process of intensive study, the class of more than 80 people is getting smaller and smaller. By the time of our senior three competition, there were only 10 people left in the class.
In the whole learning process, I think the most important thing is to pay attention to the basics and understand the concepts. At the beginning, I didn't come into contact with high school chemistry at all, and I didn't even have a basic concept of each part.
In the process of learning, I don't pay attention to mastering these concepts accurately, but only know the contents of various laws and theorems, and I can't fully understand their meaning and scope of application. This makes me can only draw a tiger according to the cat when I do the problem, and there is no clear idea of solving the problem. When the teacher talks about a topic, I solve a problem.
When you encounter a problem that you have never seen before, there is nothing you can do. For example, when I study chemical reaction rate and chemical equilibrium, I often confuse them. I don't know which type to start with when I encounter problems. I only do a few distinctive questions that the teacher has taught me. If you encounter a problem that changes a little, you can't solve it according to the meaning of the problem.
Later, I changed my study strategy. I didn't rush to do the problem first, but paid close attention to the foundation. I fundamentally understand what chemical equilibrium is and how to calculate the chemical reaction rate. I thoroughly understood these concepts, and then I began to do the problems and became handy. By paying close attention to the foundation, we mean not only understanding the foundation, but also mastering it skillfully.
After learning the lesson, I attached great importance to every part of knowledge when studying chemistry. When learning knowledge, I will read books repeatedly, while recalling what the teacher said, and try to establish a correct view when I begin to accept this new knowledge.
After that, we should also pay attention to reviewing this part to deepen our understanding of this part of knowledge and establish a deeper thought. After learning part of this way, choose some typical questions to practice properly, so as to test how well you have learned this part of knowledge.
While carrying out the above-mentioned learning process, we should remember, summarize and summarize the characteristics of chemistry, especially when learning the properties of chemical substances, we can take the knowledge of elemental compounds as the basis and the theory of material structure as the guidance. For example, when studying nitrogen group elements, we can use the theoretical knowledge of atomic structure and periodic law of elements to summarize the changing law of structure and properties of nitrogen group elements, and thus draw the conclusion that "with the increase of the number of layers of electrons outside the nucleus, the trend of nitrogen group elements gaining electrons gradually weakens and the trend of losing electrons gradually strengthens".
This is an important basis for the gradual change of their chemical properties, and it is also the main reason why these elements "gradually weaken their nonmetallic properties and increase their metallic properties with the increase of nuclear power charge". At the same time, according to the position of nitrogen group elements in the periodic table of elements and their extranuclear electronic configurations, it can be inferred that nitrogen group elements are more nonmetallic than carbon group elements in the same period, but less nonmetallic than oxygen group and halogen group elements in the same period.
In this way, under the guidance of theory, we have deepened our understanding of the knowledge of elemental compounds, and changed the knowledge of elemental compounds from a scattered, listed and mechanical description to a whole, systematic and organized knowledge network. In addition, as I said above, chemistry learning is easy to be confused, because there are many knowledge points, mixed memories, chemistry.
5. For the understanding of chemistry, write an article with a minimum of 0.27 yuan for library members to check the complete content > Layout and thickness Understanding of chemistry is a science that studies the composition, structure, properties and changing laws of substances.
The world is made of matter, and chemistry is one of the main methods and means used by human beings to understand and transform the material world. It's a 323133532363134313635438+03635438+036353333e4b893E5b65438. If the word "chemistry" is interpreted literally, it is "the science of change".
Chemistry, like physics, is the basic science of natural science. Chemistry is a natural science based on experiments.
Many people call chemistry "central science", but this is an inaccurate concept. It is a science that studies the composition, structure, properties and changing laws of matter.
This is the core foundation of chemical change and western science. Chemistry plays an important role in our understanding and utilization of matter. The universe is made of matter, and chemistry is one of the main ways and means for human beings to understand and transform the material world. It is a discipline with a long history and full of vitality. It is closely related to human progress and social development, and its achievement is an important symbol of social civilization.
Chemistry ensures the survival of human beings and constantly improves the quality of human life. Such as: using chemistry to produce fertilizers and pesticides to increase grain output; Using the chemical synthesis of drugs to inhibit bacteria and viruses and protect human health; Using chemistry to develop new energy and new materials to improve human living conditions; Using chemistry to comprehensively utilize natural resources, protect the environment and make human life better.
From the primitive society in which fire was used to the modern society in which various artificial substances were used, human beings are enjoying the fruits of chemistry. Human life can be continuously improved and improved, and the contribution of chemistry plays an important role in it.
Chemistry is an important basic science and an applied science, which is closely related to physics, biology, geography and astronomy.
6. "Chemistry Life Learning" What is the most important in composition life, of course, is food, clothing, housing and transportation.
Clothes: It was really cool for a while, but now pure cotton is popular. But can cotton-padded jacket sell for such a good price without so much chemical treatment? The buttons of clothes are also chemicals. Also, washing clothes requires washing powder.
Food: It is popular for us to eat green food now, but the oil, salt, sauce and vinegar are still related to chemistry, right? A healthy diet is inseparable from chemical knowledge.
Live: some people will say, is the house I live in also built by chemical methods? Yes, there is a kind of brick made of chemical solid waste now. Even if you don't live in such a house, your house must be decorated. The paint used for decoration is chemicals.
Ok: Do I have to use chemistry when I walk? Walking on two legs, of course not. Chemistry is used in bicycle chrome plating, automobile painting, automobile tires and gasoline.
Since chemistry is so important, is it a hot subject? Is chemistry a very popular major? Not for the time being. At present, materials, energy and biology related to chemistry are very popular, and related industries are also very profitable. It seems that things that can be used anywhere are not necessarily the most popular. On the contrary, because it is the foundation, the threshold is low (of course, it will be profound if it goes deep), and there are many people engaged, but it is not prosperous. Chemistry is a basic subject, and many researches serve other industries. Chemical-derived materials, energy and biological industries have better economic benefits because they directly serve the national economy and meet social needs. Economically, value is related to scarcity. Things that seem very useful are not necessarily the most valuable economically.
Of course, since chemistry is the foundation of so many popular industries, it is indeed necessary for a country to develop it; As an individual, you will certainly find opportunities to develop yourself in it. How to find it? I haven't figured it out yet.