Now that the school year is in its third year of junior high school, how can I learn chemistry well?

Chemistry a lot of little details. The test is to write detailed knowledge points. Junior high school is not yet systematic.

You have to be serious. Go remember. The attitude can't be bad.

This is actually very simple, don't be afraid. There is also a table of elements. Don't remember.

In junior high school exams will be given. The teacher will also tell you the mantra for memorizing the elements. Carefully write down the little knowledge points that the teacher told you.

That's where the gap opens.

The mantra is also temporary, read and write it a few more times, and remember the position of each element (horizontal and vertical) and the elements of this column, and it's OK.

Hydrogen helium. Lithium, beryllium, boron, carbon, nitrogen, oxyfluorine, neon.

Sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chloride, argon.

Potassium and calcium... This is good for both junior high and high school chemistry.

Grasp the basics in all subjects!

Take good notes in class and read the textbook carefully.

The very important thing in science is to do the questions, learn from the questions, and learn the knowledge points tested in the questions thoroughly, so as not to leave dead ends.

element....There is no need to rush this, each teacher will have a different formula, and it is good to master the first 18 elements in junior high school.

In the third year of junior high school, just remember the first 20 of the periodic table, five or five back, it should not be difficult, to remember more chemical formulas, and collect what you usually see into a special small book, which has benefited a lot after a long time! You can ask your chemistry teacher for help! Junior high school chemistry is not difficult, as long as you understand it carefully, exercise your imagination, understand the essence of those reactions, and ask more questions to the teacher, junior high school chemistry will be done.

The teacher will know a lot about it, and it will also help you understand memorization.

Learn more and memorize more, remember the phenomenon, and analyze the essence. Everyone has their own method of formula, associative memory.

Just read it all the time. If it's smooth, you'll be able to memorize it.。。。 Hydrogen, helium, lithium, beryllium, boron... How smooth it is.

I remember the two sentences when I was learning: the beautiful Guilin, the beggar of Liuluajia. Not sure if it will help you.

In fact, chemistry I know is half-literate and half-rational, and I have to memorize chemical equations. I also need to do a lot of problems, but I think I try to make sure I have as much time as possible to do math. Because chemistry is, after all, a half-liberal and half-science topic, which is basically assigned by the teacher, I still do more mathematics in my spare time.

It doesn't seem to be. Chemical formulas are important, and at the same time, pay attention to the lectures and take good notes.

5 5 backs Slip the back of the slip.

I don't need to memorize, I usually remember it when I do the exercises, I am now ready to go up to the third level, and I only need to memorize the first 20 of the periodic table.

Basically, it's 5 5 notes, and when you see more, you remember them all.

Hydrogen, helium, lithium, beryllium, boron...

Carbon, nitrogen, oxyfluorone, neon.

Sodium, magnesium, aluminum, silicon, phosphorus.

Calcium potassium argon thiocide.

The third year of junior high schoolChemical elementsTable good memorization mantra:

Hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chloride, argon, potassium, calcium.

Memory formula: Dear Li Pipeng, open and blessed.

Hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon) that beauty Guilin, beef to add calcium. (sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chloride, argon, potassium, calcium).

The story version of chemical elements slipped by:

Hydrogen, lithium, sodium, potassium, rubidium, cesium, francium - Li Na, please bored.

Add the manuscript to the private interview.

Beryllium, magnesium, calcium, strontium, barium, radium - comparable to Gates.

Thundered. Boron, aluminum, gallium, indium, thallium - touching the girl to marry him.

Carbon, silicon, germanium, tin, lead—the westward migration of returnees.

Nitrogen, phosphorus, arsenic, antimony, bismuth - the egg is closed in the body.

Oxysulfur, selenium, tellurium, noisy potatoes, polonium - raising cattle West hoof flutter.

Chlorochlorobromoiodine astatine - father and daughter embroider some love.

Helium, neon, argon, krypton, xenon, radon, - harm to the first move.

Periodic table of chemical elementsThe mantra song must be memorized in junior high school: hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, argon, potassium, calcium.

The periodic table of chemical elements is based on atomic weight.

A list of chemical elements sorted from smallest to largest. The list is generally rectangular in shape, with spaces in the period of some elements, so that elements with similar characteristics are grouped into the same family, such as alkali metal elements, alkaline earth metals, and halogen group elements.

Noble gases, non-metals, transition elements, etc.

This results in the periodic table forming an elemental partition with seven primary families, seven secondary groups, and zero families. Because of its ability to accurately ** the properties of various elements and the relationships between them, it is widely used in chemistry and other scientific fields as analytical chemistry.

Useful frameworks for behavior.

The song of chemical valence in junior high school:

Potassium hydrochloride, sodium monovalent silver, bivalent barium oxygen, calcium, magnesium, zinc, trialuminum, tetrasilicon, phosphorus, pentavalent, 246 sulfur are all all. It is not difficult to talk about price change, two or three iron, two or four carbon, three two four five nitrogen are available, two four six or seven manganese to occupy, copper and mercury bivalent is the most common.

Chlorochlorobromo-iodine is minus one, and the special condition is plus seven.

The formula for the third chemical element table to memorize:

1. A donkey's foot is asked to take silver, (monovalent potassium hydrochloride sodium silver.) )

Two sheep cover the beauty vest. (Divalent oxygen, calcium, magnesium, barium, zinc.) )

Monovalent potassium hydrochloride, sodium silver, divalent oxygen, calcium barium, magnesium zinc.

3. Aluminum, 4 silicon, pentavalent phosphorus, 23 iron, 24 carbon.

Nitrogen is found in the first to fifth valents, with copper mercury bivalent being the most common.

Positive copper, potassium, potassium, sodium, silver, copper, magnesium, calcium, barium zinc.

3. Aluminum, 44 silicon, 46 sulfur, 245, nitrogen, 35 phosphorus.

157 chlorine 23 ferric, 2467 manganese is positive.

Carbon has positive four and positive two, and then keep the negative price in mind.

Negative iodine bromo, fluorochlorine, negative dioxysulfur, phosphorus triazonide.

2. Divide the five elements into a group and memorize them.

Hhelibeb (hydrogen, helium, lithium, beryllium, boron).

CNOFNE (carbonnitrogenoxyfluorone).

Namgalsip (sodium, magnesium, aluminum, silicon, phosphorus).

Sclarkca (calcium argon thiochloride).

Sctivcrmn (scandium, titanium, vanadium, chromium, manganese).

feconicuzn (iron, cobalt, nickel, copper, zinc).

3. I am hydrogen, I am the lightest, and the rocket relies on me to carry satellites; I'm helium, I'm a scoundrel, and I'm the best at gaining and losing electrons.

I am lithium, which has a low density, and bubbles up when it encounters water and acid; I am beryllium, playing with the skin, although it is difficult to ionize metal.

I'm boron, a little red, and I'm poor when it comes to electrons; I am carbon, slow to react, able to form both chains and rings.

I am nitrogen, I am flame retardant, and ammonia can be synthesized by hydrogenation; I'm oxygen, don't think about it, I'll be panicked when I leave.

I am fluorine, the most vicious, grab an electron and be satisfied; I'm neon, and it's not bad, and the red light is emitted when it's energized.

I am sodium, I have a big temper, and when I encounter acid and water, I will be angry; I'm magnesium, I love beauty the most, and photography fireworks shine brightly.

I am aluminum, at room temperature, in concentrated sulfuric acid to take a bath; I'm silicon, black and gray, and the information elements pile me up.

I am phosphorus, a pest, and my name is on the list of poisons; I'm sulfur, I've been around for a long time, and I'm the best at precipitating metals.

I am chlorine, yellow-green, metallic electrons I rob; I'm argon, the activity is poor, and the neon purple light I will emit.

I'm potassium, add fire, superoxide to the house; I am calcium, body love, bones and teeth I am in.

Methods of learning chemistry in the third year of junior high school

1. Have a firm grasp of chemical terminology.

Serious use of chemical tools is the minimum condition for learning chemistry well. In junior high school, students should master the following chemical terms:

Some element names, element symbols and classifications2Accurately grasp the name, common name and chemical formula of a substanceThe chemical formula is a combination of the type of element and the number of atoms in the smallest particle (generally referred to as a molecule) of the substance. Write accurately, learn to name, and be familiar with common names.

In order to accurately grasp the writing of chemical formulas, students should be proficient in the use of "valency" on the basis of understanding when learning "valency" to ensure that the writing of chemical formulas is accurate.

2. Write chemical equations accurately.

The chemical equation is the correct result of the chemical reaction expressed by the chemical formula, and is based on the chemical reaction facts and the law of conservation of mass to guide the production of the chemical industry.

Writing chemical equations and making relevant calculations according to chemical equations are the key and difficult points for students to learn chemistry. Students should pay attention to this part of learning, understanding and memorization.

The periodic table of chemical elements slips smoothly:I am hydrogen, I am the lightest, and rockets rely on me to carry satellites;

I'm helium, I'm a scoundrel, and I'm the best at gaining and losing electrons.

I am lithium, which has a low density, and bubbles up when it encounters water and acid;

I am beryllium, playing with the skin, although it is difficult to ionize metal.

I'm boron, a little red, and I'm poor when it comes to electrons;

I am carbon, slow to react, able to form both chains and rings.

I am nitrogen, I am flame retardant, and ammonia can be synthesized by hydrogenation;

I'm oxygen, don't think about it, I'll be panicked when I leave.

I am fluorine, the most vicious, grab an electron and be satisfied;

I'm neon, and it's not bad, and the red light is emitted when it's energized.

I am sodium, I have a big temper, and when I encounter acid and water, I will be angry;

I'm magnesium, I love beauty the most, and photography fireworks shine brightly.

I am aluminum, at room temperature, in concentrated sulfuric acid to take a bath;

I'm silicon, black and gray, and the information elements pile me up.

I am phosphorus, a pest, and my name is on the list of poisons;

I'm sulfur, I've been around for a long time, and I'm the best at precipitating metals.

I am chlorine, yellow-green, metallic electrons I rob;

I'm argon, the activity is poor, and the neon purple light I will emit.

I'm potassium, add fire, superoxide to the house;

I am calcium, body love, bones and teeth I am in.

I'm titanium, transition comes, shuttle I come cover;

I'm chromium, hexachrome, and the alcohol comes green when it comes over;

I am manganese, with a lot of valence and heptaoxide ** fierce;

I am iron, with a wide range of uses, and stainless steel calls me Lord;

I am copper, purple and red, and brown and red with nitric acid;

I am arsenic, dark in color, and the trivalent element takes your soul;

I am bromine, volatile and smelly, and the liquid non-gold I come to show;

I am rubidium, alkali metal, dipping water fireworks potassium is not as good;

I am iodine, sublimated smoke, encountering starch blue spots;

I am cesium, golden yellow, into the water ** container broken;

I'm tungsten, high temperature, and other metals whine early;

I am golden, very stable, thrown into the king water shadow invisible;

I am mercury, highly toxic, and liquid metal is my own;

I am uranium, and after enrichment, I am the best at building atomic bombs;

I am gallium, which is easy to melt, and the boiling point is very high and difficult to evaporate;

I am indium, soft as gold, and careful with slight radiation;

I am thallium, can lose hair, poisoned and famous to see Tsinghua;

I am germanium, can be lattice, infrared window can be used as a shell;

I am selenium, tonifying the human body, and there is a mystery in the oral liquid;

I'm lead, I can store electricity, and I can also show up in bullets.

The mantra for the third chemical element table to memorize is:Hydrogen, lithium, sodium, potassium, rubidium, cesium, francium - please Li Na to join the private interview;

Beryllium, magnesium, calcium, strontium, barium, radium - comparable to Gates was thundered;

Boron, aluminum, gallium, indium, thallium - touching the girl to marry him.

Carbon, silicon, germanium, tin, lead—the westward migration of returnees.

Nitrogen, phosphorus, arsenic, antimony, bismuth - the egg is closed in the body.

Oxysulfur, selenium, tellurium, polonium - cattle raised west hoof puff;

Chlorochlorobromoiodine astatine - father and daughter embroider some love.

Helium, neon, argon, krypton, xenon, radon, - harm to the first move.

The top 20 elements of junior high school chemistry slip smoothly.

I am hydrogen, I am the lightest, and rockets rely on me to carry satellites;

I'm helium, I'm a scoundrel, and I'm the best at gaining and losing electrons.

I am lithium, which has a low density, and bubbles up when it encounters water and acid;

I am beryllium, playing with the skin, although it is difficult to ionize metal.

I'm boron, a little red, and I'm poor when it comes to electrons;

I am carbon, slow to react, able to form both chains and rings.

I am nitrogen, I am flame retardant, and ammonia can be synthesized by hydrogenation;

I'm oxygen, don't think about it, I'll be panicked when I leave.

I am fluorine, the most vicious, grab an electron and be satisfied;

I'm neon, and it's not bad, and the red light is emitted when it's energized.

I am sodium, I have a big temper, and when I encounter acid and water, I will be angry;

I'm magnesium, I love beauty the most, and photography fireworks shine brightly.

I am aluminum, at room temperature, in concentrated sulfuric acid to take a bath;

I'm silicon, black and gray, and the information elements pile me up.

I am phosphorus, a pest, and my name is on the list of poisons;

I'm sulfur, I've been around for a long time, and I'm the best at precipitating metals.

I am chlorine, yellow-green, metallic electrons I rob;

I'm argon, the activity is poor, and the neon purple light I will emit.

I'm potassium, add fire, superoxide to the house;

I am calcium, body love, bones and teeth I am in.

The formulas for the three chemical elements are as follows: hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxyfluorine, neon. (sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chloride, argon, potassium, calcium). Manganese, iron, copper, zinc, silver, iodine, barium, tin, lead, hydrogen. Tungsten-magnesium-aluminum alloy, helium-neon laser empty.

1. The mantra of the chemical element table is easier to remember.

Dear Li Pipeng, preserved eggs pave the road of iron and blindness. (hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon).

Sodium magnesium flashes red walls, and the pebbles are glorious. (sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chloride, argon, potassium, calcium).

There are thousands of crooked necks on the mountain, who loves who is not as good as pomelo fragrance. Tungsten-magnesium-aluminum alloy, helium-neon laser empty.

2. Table of chemical elements.

The list of chemical elements is a list of elements arranged in order of the number of nuclear charges of the elements, atoms, and nuclear charges. One of the expressions is the periodic table burning, which shows the regularity of the electron configuration outside the nucleus of an element and the periodicity of the element's properties.

The list of chemical elements contains all known chemical elements, including metallic elements, non-metallic elements, transition elements, noble gases, etc. It is an important tool for understanding the composition and properties of matter, as well as for exploring new chemical reactions and materials.

The important role of the table of chemical elements in the study of chemistry:

1. It is the foundation of chemistry learning

The list of chemical elements is the first step in learning chemistry, which provides a list of all known chemical elements, which is convenient for students to query and understand the basic information of the elements.

2. It helps to understand the periodic law:

The periodic table shows the regularity of the electron configuration outside the nucleus of the element and the periodicity of the element's properties, which helps to understand the periodic law and thus better understand the similarities and differences between the elements.

3. It provides tools for element comparison and classification:

The periodic table makes it easy to compare the atomic structure, electronic configuration, and chemical properties of different elements, and to classify and organize the elements.

4. It is a tool for understanding and describing chemical reactions and material compositions

Through the periodic table, it is possible to understand and describe the composition and properties of substances involved in chemo-pure reactions, so as to better understand chemical processes and changes.