What should I do if I don t adapt to the chemical reaction in the first year of high school, and wha

Figuring out what the essence of the reaction is, is regular... To sum up, if you don't understand, you don't understand...

It is necessary to pay attention to the rules in it, and in high school, it is necessary to look at the classification of question types.

The first thing to say is that this is a very normal phenomenon, don't worry.

Junior high school chemistry is an entry-level level, there are relatively few equations, and the regularity between equations is very obvious, even if you don't understand it, it is easier to remember.

However, the chemical reaction in high school requires a deeper level and needs to be understood from a deeper level, such as the oxidative and reducing relationship between substances, intermolecular forces, etc., which are much more complex than those in junior high school.

Don't be in a hurry! It's going to take a long time.

However, the chemical reaction in high school requires a deeper level and needs to be understood from a deeper level, such as the oxidative and reducing relationship between substances, intermolecular forces, etc., which are much more complex than those in junior high school.

Don't be in a hurry! It's going to take a long time.

Solution: 1. Stick to the bottom line and do what you can on the road to improving your ability

The course of the first year of high school is indeed difficult, and the large number of abstract concepts that appear is difficult to understand, and it is undoubtedly more difficult to use these concepts to solve problems. Then you need to stick to the bottom line, that is, to study in class with quality and quantity, and then complete the homework in the textbook independently.

2. Sort out your clues and quickly find your own way of learning

To make the most of the timetable, it is recommended to study the timetable carefully, which will give you a clue about your daily learning. In the process of continuous experimentation, you will find your own way of learning, and the best way to learn is to follow the steps.

3. Grasp the main and grasp the weight, release the pressure in a timely and effective manner, and obtain power

The most important thing in the first year of high school is to maintain a state of learning, step by step, and explore as much as possible.

4. Take a long-term view, dilute the immediate difficulties and focus on future progress

If you can see the learning process and learning rules of the entire high school in the first year of high school, and have a macro understanding of high school learning and the college entrance examination, then there will be less anxiety in your heart.

Phenol + CO3 (2-)-phenol ion + HCO3 (-).

Therefore, sodium phenol + CO2 + H2O cannot form positive salts, which is determined by the strength of acidity.

H2C2O4 has 2 carboxyl groups and is a dibasic acid. NaOH and H2C2O4 are mixed in a 1:1 ratio, and of course NaHC2O4 is generated.

Similarly, the 1:1 ratio of NaOH and H2SO4 is mixed to produce NaHSO4 instead of sodium sulfate.

The reaction of NaOH and H2C2O4 solution is divided into two steps: first NaOH + H2C2O4 == NaHC2O4 + H2O, and when all the H2C2O4 is all reacted, there is still NaOH before it continues to occur.

NaOH + NaHC2O4 == Na2C2O4 + H2O, multiple weak acids all react in this way because multiple weak acids are ionized step by step. So the NaOH and H2C2O4 solution are mixed in a ratio of 1:1, and only the first reaction occurs, but the poly strong acid is not like this, but in one step, because the strong acid is fully and completely ionized, such as 2NaOH + H2SO4 ==Na2SO4 + 2H2O, so NaOH and H2SO4 1:

When the ratio of 1 is mixed, the sulfuric acid is excessive, and there are Na2SO4 and H2SO4 in the solution after the reaction

I hope you can understand the above explanation and help you.

The NaOH and H2C2O4 solution reaction is carried out in two steps: first NaOH + H2C2O4 == NaHC2O4 + H2O, when all the H2C2O4 reactions are completed, there is more NaOH to continue to occur if so.

Sodium hydroxide + NaHC2O4 = = sodium oxalate + H2O multiple weak acid reaction, much weaker ionization step by step. So the NaOH and H2C2O4 solutions are mixed in a ratio of 1:1 and only in the first reaction occurs, but this is not the case with multiple strong acids, but in one step, because the strong acids are fully and completely ionized, such as 2NaOH + H2SO4 == Na2SO4 + 2H2O, NaOH and H2SO4 1:

1 ratio mixed with excess sulfuric acid, reaction solution Na2SO4 and H2SO4 Hope the above explanation, you can see this, is helpful to you.

According to the equation for the reaction of manganese dioxide and concentrated hydrochloric acid, it can be seen that when moles of hydrochloric acid are oxidized, the amount of total hydrochloric acid required for the reaction is moles. By calculating the molar hydrochloric acid that can be obtained, the molar chlorine gas produced is the mass of calcium hypochlorite produced by the reaction of molar chlorine gas with calcium hydroxide is grams. Equations are not easy to write, you look at the textbook and find out the proportional relationship between known and unknown quantities and calculate them.

As a reminder, in the reaction between manganese dioxide and concentrated hydrochloric acid, there are 4 molecules of hydrochloric acid, of which only two molecules are converted to chlorine and two molecules are converted to manganese chloride. Therefore, the oxidized hydrochloric acid is only half of the total hydrochloric acid.

A finds the relationship between the amount of matter of the cl element.

The last generation of Ca(clo)2, both bleaching essence.

Organic: A substitution reaction: A reaction in which some atoms or clusters of atoms in a molecule are replaced by other atoms or clusters.

Addition reaction: A reaction in which an unsaturated carbon atom in a crude organic molecule is directly combined with other atoms or clusters to form a new compound.

Elimination reaction: organic matter is removed from the molecule and becomes an unsaturated molecule.

Esterification: A reaction in which acids and alcohols react to form esters and water.

Hydrolysis reaction: A reaction in which organic matter and water react to produce two or more products.

Oxidation reaction: a reaction in which organic matter is burned or oxygen is obtained and hydrogen is lost.

Reduction reaction: The reaction in which oxygen is lost to obtain hydrogen. (The hydrogenation reaction is a reduction reaction).

Polyaddition: A reaction in which unsaturated monomers polymerize to form polymer compounds.

Shrinking rock annihilation polymerization reaction: The monomers react with each other to form polymer compounds and also generate small molecules.

Cracking reaction: under certain conditions, the reaction of breaking a long-chain hydrocarbon with a large relative molecular mass and high boiling point into a short-chain hydrocarbon with a small relative molecular weight and a low boiling point.

Inorganic: Chemical reactions can be classified into four basic reaction types: chemical reactions, decomposition reactions, displacement reactions, and metathesis reactions.

Chemical reaction: The reaction of two or two substances on the modified mass to produce another substance, called chemical reaction.

a+b=c decomposition reaction: a chemical reaction in which two or more other substances are generated from one substance, which is called a decomposition reaction. a=b+c

Displacement reaction: The reaction in which one element reacts with another compound to form another element and compound is called a displacement reaction. a+bc=ac +b

Metathesis reaction: The reaction in which two compounds exchange ions with each other to form two other compounds is called metathesis reaction. ab+cd=ad +cb

And in the end, of course, there is nothing at all, for example, oxygen becomes ozone, the valency does not change, and I will add something to my mind.