Can chemical equations only be memorized, and how to memorize too many chemical equations

You don't need to memorize a lot of chemical formulas, you can do the problem according to the gain and loss of the electrons of the element, I recommend that you can write ion equations as much as possible to write ions, that is the essence of chemistry.

First identify the atoms or clusters that are oxidized and reduced, first write out these two substances and their redox products, mark the price rise and fall of oxidant and reducing agent, and then match the coefficient in an inverse form, such as the oxidant price reduction 2, the reducing agent price increase 3, then the coefficient 3 before the oxidant, and the coefficient 2 before the reducing agent, which is called the conservation of electrons.

The total amount of positive and negative charges on both sides of the horizontal line, according to the information, use hydrogen ions and hydroxide to balance the charge, for example, the left is two positively charged, and the right is not charged, then two hydroxides should be added on the left or two hydrogen ions on the right, and the specific situation is analyzed, for example, if the reaction conditions are alkaline, two hydroxides are added on the left, if not, two hydrogen ions are added on the right (generally water molecules will be added on the left at this time), which is called conservation of charge.

Finally, according to the conservation of elements, the corresponding compound is not applied on the side where the element is missing, and water is generally supplemented.

Chemistry also belongs to the discipline of memory, and many things need to be memorized.

But after knowing the principle of the equation and thinking about it carefully, there are many things that do not need to be memorized.

The main thing is to understand.

Remembering is essential, you can better associate equations with the problem, when I was studying chemistry, the teacher asked us to write equations, and I would write 100 equations a day, and then as soon as I did the problem, I knew which reaction it was, and it was not only a matter of interest, but also of effort.

Although chemistry is also a memory discipline, and many things need to be memorized, there are still many rules that can be used to understand it, and you can write it yourself.

I don't like to memorize things, so chemical equations only remember reactants and products, write them out and then trim, but it will be a bit of a waste of time. If you hate memorization as much as I do, give it a try.

Just remember the characteristics of the four major reaction types, and you don't need to memorize all the chemical equations, which is troublesome.

There are indeed a lot of chemistry equations in high school! It's miscellaneous! It's a mess! And you need to remember them all.

But as a chemical equation, it satisfies only one sentence: the type and quantity of substances do not change before and after the reaction.

Based on this and understanding, it should be possible to write well without rote memorization.

I give a few suggestions:

1. Classification. It can be memorized according to the classification of substances, according to the classification memory of elements, the relationship between divided elements, and special equations one by one.

Classification of substances: It is classified according to the chemical properties of acids, bases, salts, and oxides. Elemental classification: It is the category of reactions of other substances in each element.

Non-redox reactions.

1 If the laboratory uses CAO and ammonium carbonate as raw materials to produce ammonia, a chemical equation is used to express the reaction principle.

Analysis] NH4HCO3 thermal decomposition of NH3 is NH3, CO2 and H2O, and CAO absorbs both CO2 and H2O.

NH4HCO3 2CAO NH3 CAC3 CA(OH)22 "The ion exchange reaction that occurs in solution generally always proceeds in the direction of a decrease in ion concentration. In fact, there are a few counter-examples in this statement. As a typical counter-example, the wheel is expressed by the chemical reaction formula (or ion equation).

Answer] NH3·H2O CH3CoOHNH4 CH3COO-H2O

The first 20 elements must be remembered, and then the principle of conservation of elements is remembered, that is, the number of elements before and after the reaction is the same.

That is, if there are 3 h elements in the front, then you should also have 3 h elements in the back of the equation, otherwise you have to check that there are less.

It is not until after high school that it is required to remember that the valence is conserved, that is, the total valence state before and after the reaction is constant.

Concentrate in class and understand the rules of regular responses; After reading a chemical equation, try to recall the types of products produced by this reaction; But before you learn, let's take a look at what's going on in the periodic table at this point: The first 7 columns, each of which is a major group. There are mainly seven families.

Each group of elements has similar chemical properties, so we select only one representative element for study. This is the element that we are familiar with, all the other elements in the same row, have similar chemical properties, so this is the main group, we know everything.

Carbon is mostly organic, and in the book of organic, it is independent. I crossed out everything I didn't need. The rest that are not circled are used by accident.

Is it easy to remember? It is a compulsory course in the high school chemistry equation, the required equation is basically in the metal and non-metal parts, let's look at the metal parts, the metal parts are proficient, this chapter mainly introduces the three elements, sodium, aluminum, iron, these three elements you compare with the periodic table, it is very typical and sodium is a representative of the active elements, similar to alkali metals, alkaline earth metals. Aluminum is an amphoteric metal, similar to the third group of elements.

By the way, learn the rules of diagonals.

Iron is a variable metal that resembles a subgroup element. So, sodium-aluminum-iron is basically a representative of the metallic element! Sodium is an active metal that contains oxides and peroxides, which are different products with oxygen, water, carbon dioxide, etc., respectively, and my sentence basically summarizes the equation of sodium in high school chemistry and does not make you forget!

Look at aluminum and aluminum are amphoterics, aluminum and related compounds can react with acids and bases, and acid reactions can produce aluminum ions, which is only known in junior high school, aluminum's acid radical reaction and alkali formation, pay attention to the weak alkali in the product, the formula of aluminum and its compounds is summarized, one word to iron, can be converted between alkali metals, can produce precipitation!

First the symbol of the chemical element, then the molecular formula chemical formula, then the reaction law, and finally the reaction conditions.

Homonyms, such as sodium Na, fluorine F.

For example, acids have H, bases have OH, and oxides have O.

Categorization, e.g. acid + base = salt + water acid oxide + basic oxide = salt.

Active metal + acid == salt + h2 more active metal + salt == another metal + another salt.

Metal + Non-metal == Salt Salt + Salt == New Salt + New Salt.

Acidic oxide + alkali = salt + water Basic oxide + acid = salt + water.

Acid + salt == new acid + new salt alkali + salt == new alkali + new salt.

Metal + O2 = = Metal Oxide Non-Metal + O2 = = Non-Metal Oxide.

Acidic oxide + water = acid Alkaline oxide + water = alkaline.

For example, aluminum can react with strong bases, and HF can react with SiO2.

Comprehension: Many redox reactions do not conform to the above general rules and need to be understood and recorded separately.

The conditions for metathesis reactions should be understood: there are volatile, or insoluble, or difficult ionization substances to be generated.

Concentrate on the reaction conditions, some ignition, some high temperature, some light, some energized, some discharged, some high voltage, some catalyst and so on.

In short, read more and write more, memorize more and use more, do more questions, and naturally remember it. Good luck!

It's good to have a good grasp of the rules. I don't know if you're talking about junior high or high school, inorganic or organic. But since you still need to memorize chemical equations, it is obvious that you should be a junior high school student, so you will learn inorganic chemistry.

But whatever it is, to know the type of reaction (redox reaction?) Decomposition reactions? Displacement reaction?

Conform to the reaction? ), reaction laws (each type of reaction is especially regular), master these, you don't need to memorize chemical equations, as long as you know the reactants and reaction conditions, you can infer the products. Now that the reactants, products, and reaction conditions are there, won't they be balanced?

And sometimes you don't need a trim. And the more you do the questions and the more you react, the more proficient this skill will become. Remember, chemical equations are endless, and you can't memorize them one by one for a lifetime, but if you master the rules well, you don't need to memorize chemical equations.

As for how to master it, learning depends on the nature of the reaction in order to determine the type of reaction. I hope you can have a good teacher to teach you rules.

You can memorize the reactants and products first, write them out, and then trim.