Second year junior high school students hope you can talk to me and help me! 30

I'm glad to see this article, I'm about the same as you, my academic performance in the first year of junior high school is also very good, the first exam in our class on me a score of more than 90, I'm very happy, and I'm very proud, so my grades have dropped very much, I haven't eaten the exam, I will be disciplined by the class teacher, I am sad every time, I am determined to study hard at the beginning of every semester, but every time I give up halfway, but this semester is different, my grades began to improve, my method is: I bought post-it notes, and there is a big book. The post-it notes are:

I think it's hard to remember the English words taught by the English teacher and write them on post-it notes, paste the post-it notes to the places I will often see, buy and see once I read and spell again, so that the spoken English will be learned well, the words are remembered well, and when memorizing English texts, if you are not too troublesome, you can translate the texts into Chinese, memorize Chinese, so that it is good to memorize English. Before the teacher teaches mathematics, you should preview it and memorize the concepts, so that you can keep up with the teacher's pace in class. Physics,It's the same with chemistry.,The same is true for language.,If you have free time,You can preview in advance.,The times can be memorized in advance (in your spare time),Book:

It's very simple, that is, you will learn from the books first after each class, and then organize it again after class, so that it is easy to remember.

Yaya: I hope you can.

Forehead. There is no good way to help you. Sometimes your own mentality determines everything, and the supervisor affirms yourself, and objectively your results are really good.

There is nothing to be anxious about, too much anxiety can affect yourself. Don't think so much, just focus on learning. The teacher's words are also right and wrong, but he has more professional knowledge than you in learning, after all, this is his job, as for other aspects that you really don't want to say to your parents, just talk to your friends!

I wish you success in your own right

* Hee-hee-hee ......Your problems are related to your age, when you go through this paragraph, you will find that in fact, these problems are not problems, but this still needs a process, that is, the process of your growth So you don't think about the problems other than learning now, be down-to-earth, study well steadily, everything will be in time, and everything will become very beautiful.

Bottom line: It's more valuable to find your own learning methods that work best than to borrow someone else's temporary methods!

I see you're really messy, why are you in such a hurry! Keep your mind calm, do what the teacher says, and don't rush it! Take your time to get used to it, and be sure to study hard when you're in a calm mood!

When the state is particularly bad, you must adjust and learn again, otherwise you will get half the result! Persistence, don't give up is the greatest success!

Don't be nervous, relax your mind, study appropriately, and be diligent and hardworking.

Remember that practice makes perfect, read more books, do more questions, and believe that you will be able to do it.

Combine work and rest. It's okay to be too nervous, play appropriately.

Mine can be added to me, or you can send an email. I just got out of college on the sea of misery.

Talk to parents and let them figure it out.

The story of Xiao Ah Q, how to be reborn in pain, how to be oppressed and not give in, and then be reborn. The story is told by itself.

The world's annual apple production is about 32 million metric tons. Apples grown in the U.S. are usually half eaten fresh; about 1 5 for vinegar, juice, jelly, apple puree, etc.; About 1 6 are made into canned applesauce and used as an ingredient for pies. In Europe, a large portion of apples are made into cider and brandy.

Apple cider is used to make 1 4 percent of the world's production. The United States, China, France, Italy, and Turkey are the largest producers, while France, Italy, Hungary, Argentina, Chile, South Africa, and the United States are the largest exporters. Apples are rich in carbohydrates and vitamins A and C, and contain a lot of fiber, which is also necessary for the body.

Fresh apples have a moisture content of 85%.

Apples are rich in carbohydrates, vitamins and trace elements. It is higher in vitamin A and carotene.

Effects on disease and health.

It is rich in pectin, a water-soluble dietary fiber. Pectin has the effect of protecting the intestinal wall, activating useful bacteria in the intestines, adjusting gastrointestinal function, absorbing water, eliminating constipation, stabilizing blood sugar, beautifying the skin, adsorbing bile and cholesterol, and can effectively prevent hyperlipidemia, hypertension, hyperglycemia, clean the intestines, and prevent colorectal cancer.

Malic acid and citric acid in the sour taste of apples can increase the secretion of gastric juice and promote digestion.

Malic acid can also stabilize blood sugar and prevent diabetes, so diabetics should eat sour apples.

Apples are rich in potassium, which can prevent high blood pressure. Because the salt intake in the diet of Chinese is seriously excessive, it leads to sodium and water retention in the body and promotes hypertension. Potassium lowers blood pressure by increasing the amount of sodium that promotes high blood pressure from the kidneys, reducing the amount of sodium in cells.

Potassium also dilates blood vessels, and works with pectin to prevent metabolic syndrome.

Apples also protect against cancer and prevent lead poisoning.

Apple juice has a powerful anti-infectious effect, and people who eat more apples are far less likely to catch a cold than those who don't eat or eat less apples. Therefore, some scientists and doctors refer to apples as "all-round healthy fruits", or "general practitioners". Nowadays, air pollution is more serious, and eating more apples can improve the respiratory system and lung function, and protect the lungs from pollution and soot.

Apples have a natural pleasant aroma and have a clear effect on eliminating depression.

Traditional Chinese medicine believes that apples are flat in nature, and have the effects of nourishing the heart and lungs, invigorating the stomach and detoxifying, invigorating qi and stomach, and sobering up and flattening the liver.

It's very simple, you can write about the prodigal son's return with more than 70% of your vocabulary (narrative), or write an essay on the theme of spring.

It is sodium chloride, which is table salt, and the quality does not change. Quicklime is calcium oxide (reacts with water): CaO+H2O=Ca(OH)2 Ca(OH)2+CO2=CaCO3!

H2O mass increases. Concentrated sulfuric acid absorbs water in the air and increases in mass.

Because Ca(OH)2 reacts with CO2 to produce CaCO3 precipitate and H2O, it is not necessarily.

Soda ash is Na2CO3, which is salt, but it is alkaline when soluble in water and does not react with rust. It can only be removed with acids (HCl, etc.).

4.Because CaO+H2O=Ca(OH)2, the reaction consumes water, and there will be solute precipitation, so the solute mass decreases. However, the solubility of Ca(OH)2 and Na(OH)2 decreases with increasing temperature.

After a period of time, the temperature decreases, the solubility increases, and the solute mass also increases. But it does not exceed the original solute mass because Ca(OH)2 is slightly soluble.

Heating can make the solute easier to dissolve, and then it is also convenient to cool down the crystallization operation, which can better precipitate solids.

No, it's a physical change, it's just that the gas expands**, there is no chemical reaction, no new matter is generated, so it's not a chemical change.

Because the condition for water to reach the boiling point is 100 degrees, but it also needs to absorb higher heat from liquid to gaseous state, in the water bath method, the water in the beaker can only have a temperature of 100 degrees before it becomes water vapor, which cannot provide more heat for the water in the test tube, so the liquid in the test tube cannot boil. Therefore, the principle that the temperature does not change is often used to heat some reactions that need to be heated at a constant temperature in a water bath. Add water to a large container first, then place the container you want to heat into the container to which the water is added.

The purpose of heating is achieved by heating the water in the large container and then transferring the heat to the container that needs to be heated through the water.

The advantage is that the object is heated evenly, slowing down the melting process and making it easy to observe. In some tests, it does not cause boiling.

The first question is NaCl, and this is salt.

Concentrated sulfuric acid is absorbent.

Quicklime absorbs water in the air because quicklime is composed of calcium oxide, which is placed in the air to absorb water to produce calcium hydroxide, that is, hydrated lime.

Sorry, I just got it wrong.

Supplement upstairs, 2There must be Na2CO3, there may be CaCO3 It is composed of insoluble matter and substances in the subject stem with a sufficient amount of water, and it is known that there is CaCO3, but this CaCO3 may be contained in the substance itself, or it may be produced by the reaction of Ca(OH)2 with Na2CO3. It is known that there must be CO3 2 and CaCO3 has been filtered out in the first step, so it must contain Na2CO3 3 Soda ash is Na2CO3, which is alkaline in hydrolysis, and the composition of rust contains Fe2O3, and it is necessary to use an acidic solution to remove the rust, such as NH4Cl dissolved Filtration, heating and concentration, cooling and crystallization.