How to learn chemistry. I had 9 doors in my first year of high school, and I was busy to death

If you are a boy, put down the liberal arts, so that you will have six, and then concentrate on science and mathematics, for the study of chemistry is mainly to do problems, and if you do more, it will be, and it is unrealistic to memorize equations, because you don't know when to use them, so do more questions.

Possible compositions: Fe, Cu, Fe2O3, Cuo

Sulfuric acid analysis is added: Fe is used to generate gas to generate Fe2+, OH- is added, and Fe2O3 is obtained after filtering and burning in the air

Cu, does not react, leaving filter residue.

Fe2O3, to generate Fe3+ or Fe2+ (reacts with Fe), add enough OH-, burn to produce Fe2O3, CuO, to generate Cu2+

As can be seen from the title: there is no cuo; Cu= Finally total Fe2O3 = so iron mass: Fe = X

Equation: x*(160 112)+

Solution: x=generate hydrogen v=(,(think that Fe reacts with Fe3+ first and then reacts with H+ to form gas) is not necessarily correct, just know the meaning.

Partially oxidized Fe-Cu alloy (oxides are Fe2O3, Cuo) altogether, add a sufficient amount of dilute sulfuric acid, product: 1 standard condition VML of gas; 2. Consideration of slag; 3 filtrate a (no copper ions). Add a sufficient amount of sodium hydroxide to the filtrate, filter, burn, and find the remaining solids.

First: understanding is the most important thing. Of course, understanding here is not just about understanding in the classroom. You don't have to say that you must understand, because it is impossible to forget it in just a few days or weeks after understanding, and with the usual consolidation, it will be easy to learn in general.

Second: From the above, it can be seen that memory is essential. Since high school is just a foundation, memory is very important, and in order to get a good grade, memory can be just as important as understanding.

For example, who is more important, spirit or wealth? Matter determines the superstructure, so it is equally important.

To put it simply, comprehension is the foundation of memory, memory is the consolidation of understanding, comprehension is classwork, and memorization is homework. In high school, you should relax and not be anxious, chemistry is easy to learn. As long as you understand the principle and know it by heart, you can be invincible.

Respond to all changes with the same, never deviate from the original, and do not fall into the sea of questions or do no homework at all. The best way to learn is to have both the bottom of your mind and follow the teacher.

Well, your chemistry in junior high school must not be very good, otherwise you wouldn't be bad in your first year of high school. Your foundation is not solid, and there are not many things you need to memorize in junior high school, mainly chemical formulas, equations, phenomena, gains and losses of electrons, etc. It's not too late if you put your mind to it now.

The idea of doing a question every time you do it now should be, you should know the new thing you will do, you will know the correct answer to the idea that you won't do, remember it after you finish, and the way to memorize it is to keep doing the question, other feelings are not suitable for you, there is no time, just squeeze time, there are no books to think in your head! Equations can't be written, you have to flip through the book to read, the teacher teaches the smooth law to often say, you such as 1-20 elements, you repeat it a few more times, to memorize the chemical symbol h he li ......Electron gain and loss remember, feo, fe3o4 fe2o3 discrimination and analysis, reasoning also to remember the elemental hair oxidation reaction, what color changes will occur. The law of conservation, which is very important, will be used in calculation problems.

In general, you have to be diligent, and if you like it, you will learn well and turn the book often. It's not hard to remember.

Indeed, chemistry is a liberal arts in science, if you can't memorize the equation, it's the same as not learning, but now there are not many equations that really ask you clearly in the exam, all of them are what you haven't learned, the main thing is the conservation of elements, the conservation of materials or something, and then use the given mass calculation, generally the integer can be divided, it really can't be logarithmic, except for the can't be definitely wrong, and even if you can't, you can never give up, the real college entrance examination is not as difficult as you think, you just follow the study, don't fight for the first, but to keep the middle, That's enough, you are now in your first year of high school, and you haven't learned much, you can look at the college entrance examination papers to see which ones you are learning now are the key points, but the second year of high school is very important, and the class is almost over, so you must study hard. I'm not good at physics, I haven't passed for three years, you guess it's not as miserable as me, but I just don't give up and don't fight, just go to the public, and finally took the college entrance examination 90, I think I'm quite satisfied, you don't pay too much for a subject that you are not very good at, you have talent in learning everything, your energy is limited, you can learn well and learn well, and if you are not good, you will be at the middle level, and you can do this in the end.

Chemical memory verbal decision.

Oxygen production formula:

potassium manganese chlorate dioxide; Mix evenly and add heat.

Oxygen concentrators have characteristics; The bottom is high and the mouth is low and slightly sloping.

Gas collection formula: with water with exhaust method; Set up and down according to the density.

insoluble micro-dissolution drainage method; The resulting gas is of high purity.

Electrolyzed water formula:

Positive oxygen body can help combustion; Negative hydrogen body can be burned with great energy.

Valency formula:

The main valency of common elements.

chlorochlorobromoiodine negative monovalent; N-monohydrogen silver with potassium sodium.

The minus two of oxygen should be remembered first; n-dimagnesium, calcium, barium and zinc.

positive three is aluminum, positive four silicon; Let's put the price change down.

All metals are regular; One or two coppers come two or three irons.

Manganese is 24 and 67; The two or four of carbon should be kept in mind.

non-metallic negative main is uneven; Chlorine is negative one positive one five seven.

Nitrogen and phosphorus minus three and plus five; Different phosphorus, three nitrogen, two or four.

Sulfur has minus two, positive, four-six; It will be cooked when you use it while memorizing it.

Common root price formulas:

monovalent ammonium nitrate; Hydrohalide hydroxide.

permanganate chlorate; Perchlorate acetate.

divalent carbonate sulfate; Manganese hydrosulfate.

Suspense ammonium is the normal price; Negative three has a phosphate group.

Metal Activity Order Table:

Junior high) potassium, calcium, sodium, magnesium, aluminum, zinc, iron, tin, lead, hydrogen, copper, mercury, silver, platinum.

High school) potassium, calcium, sodium, magnesium, aluminum, manganese, zinc, chromium, iron, nickel, tin, lead, hydrogen; Copper, mercury, silver, platinum.

Valency formula two.

monovalent potassium hydrochloride sodium silver; Divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, pentanitrogen phosphorus; 23 iron, 24 carbon, 24 6 sulfur are all Qi; All copper is most commonly bivalent.

Solubility of salt:

Potassium, sodium, ammonium, nitrate are soluble, hydrochloride is insoluble silver mercurous;

Sulfate is insoluble barium and lead, carbon phosphate is mostly insoluble.

Most acids are soluble and alkaline, and only potassium, sodium, ammonium, and barium are soluble.

Mention a method of my own;

Take care of the book, organize the important knowledge and equations, write it on a piece of paper and paste it in front of the number (it is not easy to lose) or find a large place without words to write. There is actually not much knowledge to have the patience to write. When you encounter a question that you don't know, you can take a look at the knowledge, and the more times you do, you just keep it in mind.

It works. That's how I learned it. By the time you review in the third year of high school, you will find that chemistry is very thoughtful.

Learning chemistry is very simple, just understand the basic reaction principles and elements (the relationship between structure and properties). The part of memory is very small, and it is very quick to learn by heart.

When you understand it, you will feel that everything is very easy, and all kinds of chemical and physical properties are related to the elements. Let's summarize the learning process. The key to the calculation problem is the recipe program, and you must learn this aspect well. You can see how much of a chemical reaction is judged by the ability to lose electrons.

In the whole high school chemistry, as long as you understand the textbook, you will be able to get a high score in the college entrance examination, and you must strengthen your memory if you should memorize it! Read the textbook of the first year of high school carefully, focus on memorization, and it will definitely work!

Understand and memorize chemical formulas, and memorize conventional knowledge deeply. Thank you for the questions, and the mistakes will deepen your memory.

It is recommended that you go to a chemistry tutor, which will not be clear for a while.

If you memorize the chemical equation well, you will usually get some points.

The basis of everything is equations, and this must be learned well.

At first glance, chemistry 6 points rely on memory.

Study carefully, 8 points in chemistry depend on understanding.