How to quickly memorize chemical knowledge points, and how to quickly memorize chemical elements

Draw inferences from one another, and unite points, lines, and surfaces.

The difficulty of junior high school chemistry focuses on acid, alkali and salt in the second semester of junior high school. There are several types of reactions: chemical reactions, decomposition reactions, displacement reactions, oxidation reactions (not basic reaction types), and metathesis reactions.

Some calculations related to chemical equations are used, so we must learn to write and be proficient: the mass fraction of the solution after the chemical reaction should clarify the meaning of the solution and reflect the type of solute and solution, and generally use the law of conservation of mass.

Chemical reaction: The reaction of two or more substances to form a substance.

Decomposition reaction: The decomposition of a substance into two or more substances.

Displacement reaction: One element and one compound react to produce another element and another compound.

Metathesis reaction: Two compounds exchange components in pairs to form two other compounds. Reaction conditions: Water or gas or precipitate in the product.

Types of metathesis reactions: 1. Acids and metal oxides form salts and water 2. Acids and bases generate salts and water 3. Acids and salts generate new salts and new bases (occurrence conditions: the salts generated must be precipitated or the acid is carbonic acid) 4. Alkalis and salts generate new salts and new bases (occurrence conditions:

The generated salt should be precipitated) 5. Salt and salt generate two new salts (occurrence conditions: the generated salt must be precipitate).

Solubility of salt.

1. Potassium salt, sodium salt, ammonium salt, and ammonium salt are soluble in water.

2. Only AgCl is insoluble, and the rest are soluble.

3. Only barium sulfate is insoluble, and the rest are soluble.

4. Only sodium carbonate, potassium carbonate and magnesium carbonate are soluble in carbonate, and the rest are insoluble.

Common insoluble substances in junior high school: copper hydroxide (blue), magnesium hydroxide (white), aluminum hydroxide (white), agcl (white), barium sulfate (white), calcium carbonate (white), barium carbonate (white).

The easiest way to learn is to:

Try to take notes in class to focus on the lesson.

In fact, students should focus on learning and develop in an all-round way.

There is a road and diligence in the book mountain, and there is no end to learning from the sea to make boats, and diligence can make up for clumsiness.

Improve learning methods.

In the process of learning, we must: listen more (listen to lectures), remember more (remember concepts, remember formulas), read more (read books), do more (do homework), ask more (ask if you don't understand), do more hands (do experiments), review more, and summarize more.

I believe that you will gradually develop good study habits and achieve success.

In particular, it will be easier to learn chemistry by memorizing concepts such as the periodic table, the priority of metal reactions, and the conditions of chemical reactions.

Memorize when you see it, and write down any equation immediately when you think of it, don't be afraid of trouble.

Memorization itself is a repetitive process.

You can't memorize it, you can only do more questions, and you will think of knowledge points when you do it, so that you can remember it best.

Also, develop interest and a sense of competition.

The method of fast memorization of chemical elements is as follows:

1. Pinyin.

Sodium (Na), Barium (Ba), Fluorine (F), Tungsten (W), Lithium (Li): The Chinese pinyin of the names of these elements is similar to the element symbol of the element, such as sodium (na), and the Chinese pinyin of "sodium" is nà; The barium element (ba), the pronunciation of "barium" is spelled by the pronunciation of the Chinese pinyin "b" and the pronunciation of the English letter "a"; Fluorine element (f), the initial of "fluorine" pronunciation is "f", tungsten element (w), and the initial of "tungsten" in Chinese pinyin is "w"; Lithium element (li), "lithium" in Chinese pinyin is "lǐ".

2. Image law.

Some elements can be memorized using a figurative approach. For example, the tungsten element (W) can be associated with the tungsten filament in an incandescent lamp, which resembles a "W" shape; Sulfur (S), which can be reminiscent of flowing water in a meandering stream, is shaped like an "S"; Oxygen (O), which can be associated with the shape of a round sun; The potassium element (k) is reminiscent of the shape of scissors that open when cutting nails.

3. Homophony method.

For example, if someone suddenly sees a piece of gold shining on the ground, he can't help but exclaim "ouch", isn't this "ouch" pronounced exactly the English letter "au"?

Fourth, rhyme grammar.

One of them: contrast memory by letter.

For example, gold, silver, aluminum, argon begins with "A", "B" begins with barium and bromine, calcium, copper, carbon and chlorine first write "C", and "M" leads with manganese and magnesium.

1. Pinyin.

Sodium (Na), Barium (Ba), Fluorine (F), Tungsten (W), Lithium (Li): The Chinese pinyin of the names of these elements is similar to the elemental symbol for that element.

For example, the element sodium (na), the Chinese pinyin of "sodium" is nà;

The barium element (ba), the pronunciation of "barium" is spelled by the pronunciation of the Chinese pinyin "b" and the pronunciation of the English letter "a";

Fluorine element (f), the initial of "fluorine" pronunciation is "f", tungsten element (w), and the initial of "tungsten" in Chinese pinyin is "w";

Lithium element (li), "lithium" in Chinese pinyin is "lǐ".

2. Image law.

Some elements can be memorized using a figurative approach.

The tungsten element (W), which can be associated with the tungsten filament in an incandescent lamp, resembles a "W" shape;

Sulfur (S), which can be reminiscent of flowing water in a meandering stream, is shaped like an "S";

Oxygen (O), which can be associated with the shape of a round sun;

The potassium element (k) is reminiscent of the shape of scissors that open when cutting nails.

3. Homophony method.

For example, if someone suddenly sees a piece of gold shining on the ground, he can't help but exclaim "ouch", isn't this "ouch" pronounced exactly the English letter "au"?

Many students think that chemistry is difficult, one of the reasons is that there are many chemical equations, and it takes a lot of time to memorize these equations.

Remembering the creatures. If you remember the chemical products, you can go to the balancing by yourself, because each chemical element has its own valency, and there are also specific formulas to memorize, although the valency of some chemical elements is uncertain, but the reactants and products are available, and the balancing is not troublesome, and it will be very fast after being familiar, and it can even be seen directly.

Directly memorize the equation. If you feel that it is difficult to trim, then you can also memorize chemical equations directly, but there is also a problem, that is, there are many equations that need to be memorized, which is easy to remember, and when you encounter equations that need to be trimmed by yourself, it will be a waste of time and difficult to get it done.

Only the reactants are remembered. It is more difficult to guess the products directly according to the reactants, but it is not too big, the two reactants are still relatively simple, and the substances that generate precipitates and gases are relatively fixed, as long as you memorize those common substances.

There are fewer chemistry equations in junior high school, and you can memorize them directly, but there are more chemical equations in high school, so it is recommended that students go to the balance by themselves, understand the essence and essence, and the simple equations can be memorized directly.

The chemical equation is more difficult and slow to balance at the beginning, so don't worry, you must do it seriously and do it right, especially the gas, precipitation, heating and other conditions and trim should not make any mistakes, otherwise it will take a long time in vain.

The chemical equation seems simple, but there should be no mistakes in every corner mark, because it is very critical in the calculation problem, and it needs to be particularly careful and careful in chemical calculations, and there is no room for sloppiness, otherwise the content of a certain element will be calculated incorrectly. Equations are the most basic in chemistry, not difficult, as long as you memorize them by heart, you can learn them, so students must have a down-to-earth spirit when learning chemistry, and they can't be ambitious.