Is there a knack for memorizing chemical equations?

In fact, chemical equations don't need to be memorized, you have to learn to look at the reactants and write the products, and then trim them. As for how to write about the product: for example, if you write about redox reactions, you will naturally know that those ions are easily reactable, and I remember that there is a order about the redox capacity of common elements, so that you can judge the products; For example, metathesis reaction, this is not certain, depending on the amount of several reactants, and the products produced in different proportions are different.

The above is for those who have never seen it, generally speaking, this kind of question will give hints, of course, it is also suitable for some simple ones, you can check it yourself. In fact, there is no trick, and if you see more, you will naturally become familiar with it

If C is fifth, then we can know that B is the second from D's statement, then E can only be fourth from B's statement, and then from E's statement, we can know that A can only be third, and D can only be first (E is fourth, Ding cannot be fourth, and E's statement must be correct, so A can only be third, and combined with the above reasoning, we can know that D is the first). If we test it again, we can find that the derivation is reasonable, so the first place is D, the second place is B, the third place is A, the fourth place is E, and the fifth place is C.

The key is to master the law of reaction and grasp the essentials, and the key is to practice more, and practice more naturally by heart

The best way to memorize chemical equations is to understand why the reaction is the way it does, and ask the teacher if you don't understand. But don't be too anxious, if you are in the third year of junior high school, you can understand the basic formula after learning the chapter on acid-base salts.

How to memorize chemical equations

1. Master the essentials of writing chemical equations.

Write the reactant on the left, write the generation on the right, write the chemical formula, the coefficient to balance, the middle with an equal sign, the condition should be clear, the precipitate gas is generated, and the arrow is indicated.

2. Categorize memory.

According to the knowledge series or reaction type or substance category memory, the scattered knowledge is summarized into a knowledge network with rules to follow and key substances as the center.

3. Linking the memory of experimental phenomena.

Chemical equations are boring and difficult to remember, how to make the learning of chemical terms sound and interesting, and can be linked to the memory of experimental phenomena.

For example, sulfur burns in oxygen, memory associations: burning sulfur into oxygen, burning becomes vigorous, the flame is blue and purple, beautiful and beautiful, and produces gas, which is really enough to "choke".

Phosphorus burns in oxygen, memory association: red phosphorus burns, it can be really lively, thick smoke billowing, bright like a "light bulb".

Methods of memorizing chemical equations.

Experimental Puzzle.

From vivid and intuitive to abstract thinking, chemical equations are faithful and essential descriptions of chemical experiments, and are generalizations and summaries of experiments. Therefore, it is most effective to memorize the relevant chemical reaction equations based on chemical experiments.

For example, under the condition of heating and using a catalyst (MNO2), the decomposition of KCLO3 is used to produce oxygen. As long as we pay attention to the experimental situation, and associate the experimental fact that white crystals are mixed with black powder and heated to produce oxygen, we will promote the understanding and memory of this chemical reaction equation

Reaction law method.

Chemical reactions are not random. The reaction laws of compounding, decomposition, displacement and metathesis are more familiar to everyone, and here we will emphasize the laws of oxidation-reduction reactions.

For example, FeCl3 is a stronger oxidizing agent, and Cu is a reducing agent that is not too weak, according to the principle that the oxidation-reduction reaction always occurs first between the stronger oxidant and the stronger reducing agent, so the two can react

2fecl3＋cu=cucl2＋2fecl2

The tips for memorizing chemistry equations in junior high school are as follows:

1. Memorizing chemical equations should be combined with reality and imagination. Experimental Ideas From vivid and intuitive to abstract thinking, chemical equations are faithful and essential descriptions of chemical experiments. For example, under the condition of heating and using a catalyst (MNO2), the decomposition of KCLO3 is used to produce oxygen.

As long as we pay attention to the experimental situation, it will promote the understanding and memory of this chemical reaction equation.

Second, the reaction law method shows that chemical reactions are not irregular. For example, FeCl3 is a strong oxidant, and Cu is not too weak a reducing agent, according to the principle that the redox reaction always occurs first between the stronger oxidant and the stronger reducing agent, so the two can react; In contrast, CuCl2 and FeCl2 are weaker oxidizing and reducing agents, so they cannot react with each other.

3. A kind of memorization technique for categorizing and summarizing. The indexing method is to number, arrange and fill in the learned equations according to the chapters or reaction characteristics in general, so as to form an equation system. Reproducing these cards in fragments of time creates a strong impression in the cerebral cortex.

4. Make good use of formulas to help yourself memorize chemical equations. In order to blurt out chemical equations when they are used, sometimes they can be compiled into some form of easy-to-remember statements according to the characteristics of chemical equations, which is called formula. For example, the mantra is:

dialkali (raw) monohydrate, sodium metaaluminate; Tricopper, eight acids, dilute, nitric oxide.