How to Improve High School Chemistry Fast? Thank you!

This is to find the law, and some special ones should be remembered ......Such as:

Na is a very reactive metal, and it can react strongly with water at room temperature, so no matter what aqueous solution is used to react with it, as long as there is water, Na will react with water first, and the generated NaOH will react with the substances in the solution. For example, when Na reacts with hydrochloric acid solution and dilute sulfuric acid solution, it first reacts with water to generate NaOH, and reacts with hydrochloric acid and sulfuric acid in the solution without displacing hydrogen.

Al, Mg, Zn, Fe and so on are relatively active metals, which cannot react with water at room temperature, but can react with acids, such as hydrochloric acid, dilute sulfuric acid, acetic acid and other non-strong oxidizing acids, and the reaction releases hydrogen. However, nitric acid is special, nitric acid has strong oxidizing properties, and the reaction produces not hydrogen, but nitric oxide (dilute nitric acid), or nitrogen dioxide (concentrated nitric acid). But iron and aluminum can be passivated in concentrated sulfuric acid, which is another special, remember.

Hydrogen, carbon monoxide, etc. are reducible, so some metal oxides can be reduced, such as iron oxide, copper oxide, etc. But carbon monoxide is toxic and needs to be known.

Chlorine and oxygen have strong oxidizing properties, so they can oxidize some reducing substances, such as carbon element, hydrogen, metals, etc.

Iron oxide, copper oxide, etc. are alkaline oxides, which can react with acid to produce corresponding salt and water, hydrochloric acid, sulfuric acid, etc.

Carbon dioxide, sulfur dioxide, etc. are acidic oxides, soluble in water to form the corresponding acid, can react with alkali to form the corresponding salt and water, but sulfur dioxide and water produce sulfurous acid, and then oxidize into sulfuric acid, which is special.

Hydrochloric acid, dilute sulfuric acid, and acetic acid are non-oxidizing acids that can react with metals to produce hydrogen and their corresponding salts.

Sodium hydroxide, barium hydroxide is a base that can neutralize with acids.

Calcium carbonate, sodium carbonate, sodium bicarbonate are salts, which can react with acid to form another salt and carbon dioxide and water, but calcium carbonate can be decomposed at high temperatures, and sodium bicarbonate can be decomposed by heating.

Barium nitrate is also a salt, which is generally used for testing, such as using barium ions to test sulfate, carbonate, and precipitate.

There are thousands of chemical substances, it is impossible to be familiar with each of them, they have all been seen, which is very particular about the classification of substances, the same kind of substances have similar properties, for example, there are some substances that you have not seen during the exam, but you can know whether it is an acid, a base, or a salt, or an oxide, so that you can roughly deduce what kind of properties it has.

Memorize more and summarize more, so that it forms a system. The specific ones can be found on the Chemistry website.

After memorizing the knowledge, do more questions to apply the knowledge flexibly.

The most practical thing is: practice makes perfect.

A lot of practice is the fundamental way to deal with exam-oriented education nowadays.

Don't memorize chemical formulas, you won't have enough time to memorize them. It is important to remember the color of the main ions, the phenomenon of the reaction. In connection with the chemical formula by the phenomenon, there are many things that can be ignored in that case.

Because there are not many chemical formulas in chemistry in junior high school or high school, there is no need to memorize them. Memorizing phenomena can also help you solve inference problems. It is recommended to classify chemical formulas such as neutralizing, redox, batteries (although they are all redox), etc.

Then it is necessary to memorize the valence thoroughly (there is no way to do this, use the formula, the formula is not mandatory to remember, anyway, there are not many).

Then it's time to practice trim more.

Write down the relative molecular weights of some commonly used substances and ions that are easy to remember, such as CaCO3 is 100, NaOH is 40, sulfuric acid is 98, etc., which can save you trouble when doing problems.

Make the basic knowledge common-sense, try to complete it within 5 points when dealing with multiple-choice questions, and pursue a 100% correctness rate (because multiple-choice questions are not difficult to do, 70% are basic knowledge, and they are generally cleverly calculated, and there is no need to count a bunch of things).

The inference question is as stated at the beginning.

For fill-in-the-blank and calculation questions, please find the chemical formula.

It's still the same sentence. Skill comes from practice. It's good when you do it with feeling.

Find a review book first, common in the market, and memorize some basics.

If you do more corresponding exercises, and if you do more questions, you will have a feeling, and you will be able to do some things that you can't remember before, and you can make old mistakes.

The most important thing in learning chemistry is to memorize, and if you know how to memorize, it is the king.

Chemistry knowledge is particularly fragmented, and the teacher in the third year of high school will review it in a unified manner, so be sure to follow a good teacher and take good notes. I wasn't good at chemistry before my junior year of high school, but it was pretty much the same after the first round of my junior year of high school. Chemistry is a liberal arts subject in science, mainly by memorization, in short, just follow the teacher closely.

Also, if you know, you will definitely forget. So be sure to review it in time. The point, because it's broken, can be said to be the point, or not the point.

I don't think it's useful to tutor. But it also depends on the individual, and some students' grades are made up, really.