How simple is the coefficient of a chemical molecule to remember

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.

Such as sulfur burning 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 associations:

The red phosphorus burns, but it is really lively, and the smoke is billowing out, bright like a "light bulb".

The above is the junior version

I've never memorized chemical equations, because if you have to memorize reactants, products, and coefficients, the equations written incorrectly or misremembered are meaningless.

The most obvious example is the combustion of organic chemical reactants, such as ethanol

2CH3CH2OH + 5O2 = ignition = 4CO2 + 4H2O

How many types of organic matter are there? Do you have to remember all the organic products produced under different reaction conditions? Especially the corresponding coefficients? It's impossible and pointless.

Let's take another example of an inorganic reaction:

Iron tablets are dissolved by nitric acid, you know, the concentrated nitric acid product is generally NO2, dilute nitric acid is generally NO, and in special cases it is more likely to be N2, NH3, etc. Also, if there is an excess of nitric acid relative to iron tablets, then the product of iron is Fe(No3)3 and the deficiency is Fe(No3)2. It's also pointless.

Therefore, what you need to memorize is each knowledge point, from which the product is deduced, and the chemical equation of each coefficient is deduced from the reactant and the product, both of which must be completed in a very short time.

Of course, these two steps of the commonly used simple equation that does not change can be omitted, and you must remember it, such as zn replacing cuso4, and these are not deliberately memorized, just because there are too many such equations, too simple, so you can write from beginning to end without thinking about it.

The above is the high school version.

Remember the characteristics of a few major types of reactions.

It is relatively easy to find the oxidized and reduced atoms in the redox reaction, grasp the common valence state, and carry out the trim complex decomposition reaction.

Think about what the product has, analyze it, and practice trimming. Commonly used a few difficult to trim, the measurement number memorized. What 38324. It's good to be familiar.

To understand the principle of reaction, according to the conservation of elements and electrons, there is no need to memorize chemical equations at all, and memorizing means that you do not understand the principle at all.

If you want to find a pattern, you can draw inferences from the future!

Do more questions, I've never memorized it, and when I can't read it, read the book.

Equations are the most important chemical terms for learning chemistry, so proficient memorization and writing of chemical equations is the guarantee for learning chemistry. 1. Master the writing essentials of chemical equations Write reactants on the left, generate on the right, write the chemical formula, the coefficient to balance, the middle with an equal sign, the conditions should be clear, generate precipitated gas, and the arrow will be marked. 2. Categorize memory.

To memorize chemical formulas, you must first memorize the symbols and names of commonly used elements in the periodic table, and also understand the naming rules of chemical formulas for comprehension memory. For example, why is the molecular formula of ferric oxide Fe3O4? According to the naming convention:

The metallic element fe is written on the left, and the non-metallic element o is written on the right, which is read as (the name of the element on the right) (the name of the element on the left); If the number of fe is 3 and the number of o is 4, the number should be read out, which is read as ferric tetroxide. That is to say, you can get the type of element and the number of atoms of each element based on the name of the molecular formula, and write the molecular formula based on this.

You're in junior high school or high school. This one is different.

Starting from the essence, look at what properties each substance has, and what is the nature of this reaction. This allows you to better understand and remember the substance you generate. Then, trim yourself.

Or you can memorize the ion equation. Because the ion equation represents the nature of the reaction, it is easier to remember. Then the ion equation is introduced to the chemical equation, which is much simpler.

The memory of understanding is the longest, to understand the reaction principle of the equation, whether it is acid-base neutralization, or redox, after understanding, there is no need to memorize, do a few questions to deepen the impression.

Rote memorization, it's good to memorize well.

1. Memorize the chemical formula of the substance.

2. Be familiar with the chemical properties and preparation methods of common substances, that is, understand which substances react with, what the products are, and what the reaction conditions are.

3. Linking the properties of matter and the chemical formula of the substance mentioned above can quickly memorize the chemical equation.

Recorded according to the law of reaction;

Combined with experimental phenomena to help memory.

Organic chemistry is not difficult, and memorizing quasi-formulas is crucial.

Containing only C, H is called a chain or a cyclic hydrocarbon structure.

Double-bonded alkyne, a single-bonded alkyne, a single-bonded alkyne. Target.

Lined with chain lipids, aromatic ones with benzene rings.

Heterogeneous shared molecular formula, formula generic researcher.

Olefins addition alkanes replace derivatives what can tell me.

Hydroxyl hydrocarbons of carboxylic acids, called: alcohols, aldehydes and carboxylic acids. Target.

Carbonyl ether bonds and amino groups, etherketone derivatives are amines.

Phenylhydroxyl, phenol, naphthalene biphenyl are parallel.

To what is the so-called oxidation, to o plus h is called recovery.

Aldehydes oxidized to ketoaldehydes to become carboxylic acids.

Carboxylic acid is stronger than carbonic acid, and carbonic acid is stronger than carbolic acid.

The benzene ring in the side chain is photohalogenated to catalyze halogenation.

Halogenated hydrocarbon derivatives, halogens can be hydroxyl AC. Target.

Eliminates a small molecule, generating dilute and hydrohalic acids.

Potassium and sodium can alter hydrogen alcohols, and aldehydes are clearly discernible in the silver mirror reaction.

The mixture of copper hydroxide polyol solution is dark blue.

Alcohol is formed with esters, ester hydrolysis changes alkyd resin.

In the case of phenol, the starch precipitated by bromine turns blue when met with iodine. And.

Amino acids and acidic formic acid are acidic butteraldehydes.

Polymeric monomeric streptococcal ganglion fractures of the key series.

Do more questions and remember it naturally. You can also sum up your own experience.

Brother, you still honestly memorize the periodic table Brother came over like this back then, and sometimes you can make mistakes if you cheat.

How do you remember the chemical formula? I believe that the following points can achieve the effect of fast and effective memorization: 1. Mastery of basic chemical structures.

No matter how complex the chemical structure of medicine is, it is composed of a simple chain and ring structure, so if you don't understand the basic chemical structure and their simple connection rules, you will look at the drug structure as soon as you come up, which is undoubtedly a ghost drawing, and the human brain is not a scanning code booth, so how can you talk about memory! The most common in the structural formula of drugs is heterocyclic knowledge, and you must be familiar with them when learning medicinal chemistry. Heterocyclic Compounds Encyclopedia [Pharmacist Learning Encyclopedia] —Issue 5?.

I hope it will be helpful to everyone. Some students may have a very poor foundation in chemistry, and even double bonds, single bonds, benzene rings, chemical formulas, molecular formulas, and structural formulas cannot be understood, and may be more difficult to learn. Second, the memory structure should be memorized according to the classification of drugs.

Usually the same class of drugs have the same or similar parent nucleus, for example, the basic parent nucleus of penicillin antibiotics is 6-aminopenicillaneic acid (6-apa), cephalosporins are 7-aminocephalosporines (7-ACA), steroids of adrenocortical hormones, phenylethylamines of adrenergic agonists, quinolones of quinolone antibiotics, and so on. Knowing these basic structures, it is much clearer to look at the structural formula. Therefore, when faced with a structural formula, we can basically first judge its basic structure, determine its classification, and then structure its characteristic groups to distinguish and remember specifically.

3. Distinguish the structure from other similar drugs according to the characteristic groups. When memorizing a drug structure, it is not an isolated memory, but after being familiar with the basic parent nucleus of its mold wheel, it should be distinguished from the structure of other similar drugs. For example, cephalexin and cefaclor, their basic parent nucleus is the same, the difference is that cefaclor 3 is chlorine and cephalexin 3 is methyl, so as to distinguish it, it can be remembered more clearly, and the effect of twice the result with half the effort is achieved.