Does anyone know the details of chemistry in secondary school 5

Potassium, sodium, ammonium salt, nitrate, are easily soluble in water.

Chlorine insoluble silver mercurous (meaning silver chloride, mercurous chloride are insoluble in water) sulfuric acid insoluble is barium lead (barium sulfate, lead sulfate insoluble).

Most of the above are what you will use in junior high school.

Valence: potassium, sodium, silver, hydrogen positive monovalent, calcium, magnesium, barium, zinc positive bivalent; Aluminum is positive trioxygen-di, chlorine minus monovalent is the most common; Sulfur has negative two positive four six, positive two positive three iron variable; positive one, two, copper, two four, and the zero price of the element will never change;

Other elements have valence, which is calculated by dying first and then living.

The valence should be accurate, monovalent potassium, sodium, silver chloride, divalent oxygen, calcium barium, magnesium, zinc, trisilicon, tetraaluminum, and pentavalent phosphorus;

It is not difficult to talk about price change, 23 iron, 24 carbon, 246 sulfur are complete, and copper and mercury bivalent are the most common;

The atomic group should not be divided, monovalent ammonium hydroxide, divalent sulfate carbonate, and trivalent phosphate.

Monovalent fluorochlorobromide, iodidine, hydroodium, and metals, potassium, sodium, silver, divalent barium oxide, calcium, magnesium, zinc, aluminum, trisilicon, and tetrasilicon, all fixed chloride and nitrogen, and the valence should be paid attention to: 12, copper, mercury, 13, gold, 24, carbon, lead, 23, iron, 246, sulfur, 35, phosphorus, fluorochlorobromo, iodine, negative monovalent; N-monohydrogen silver with potassium sodium. The minus two of oxygen should be remembered first; n-dimagnesium, calcium, barium and zinc.

positive three is aluminum, positive four silicon; Let's put the price change down. All metals are regular; One or two coppers come two or three irons.

Manganese is 24 and 67; Carbon 24 to keep in mind. non-metallic negative main is uneven; Chlorine minus one positive one five seven.

Nitrogen and phosphorus minus three and plus five; Different phosphorus, three nitrogen, two or four. Sulfur has minus two, positive, four-six; It will be cooked when you use it while memorizing it. Valency.

potassium, sodium, silver, hydrogen positive bivalent, calcium, magnesium, barium, zinc; Aluminum is positive trioxygen-di, chlorine minus monovalent is the most common; Sulfur has negative two positive four six, positive two positive three iron variable; positive one, two, copper, two four, and the zero price of the element will never change;

Other elements have valence, which is calculated by dying first and then living.

The valence should be accurate, monovalent potassium, sodium, silver chloride, divalent oxygen, calcium barium, magnesium, zinc, trisilicon, tetraaluminum, and pentavalent phosphorus;

It is not difficult to talk about price change, 23 iron, 24 carbon, 246 sulfur are complete, and copper and mercury bivalent are the most common;

The atomic group should not be divided, monovalent ammonium hydroxide, divalent sulfate carbonate, and trivalent phosphate.

Monovalent fluorochlorobromide, iodidine, hydroodium, and metals, potassium, sodium, silver, divalent barium oxide, calcium, magnesium, zinc, aluminum, trisilicon, and tetrasilicon, all fixed chloride and nitrogen, and the valence should be paid attention to: 12, copper, mercury, 13, gold, 24, carbon, lead, 23, iron, 246, sulfur, 35, phosphorus, fluorochlorobromo, iodine, negative monovalent; N-monohydrogen silver with potassium sodium. The minus two of oxygen should be remembered first; n-dimagnesium, calcium, barium and zinc.

positive three is aluminum, positive four silicon; Let's put the price change down. All metals are regular; One or two coppers come two or three irons.

Manganese is 24 and 67; Carbon 24 to keep in mind. non-metallic negative main is uneven; Chlorine minus one positive one five seven.

Nitrogen and phosphorus minus three and plus five; Different phosphorus, three nitrogen, two or four. Sulfur has minus two, positive, four-six; It will be cooked when you use it while memorizing it.

First of all, we have to remember the valency of each element

Potassium, sodium, hydrogen and silver are positive one price.

Calcium, magnesium, barium, zinc positive bivalent.

Chlorochlorobromoiodine negative monovalent.

Usually oxygen is minus bivalent.

Cuprous is one, copper is two.

Asia is the second and the second is the iron.

3. Aluminum, tetrasilicon, pentavalent phosphorus.

Carbon has positive two and positive four.

Sulfur has negative two, positive four, and positive six.

Don't forget that the quality price of the unit is zero.

Atomic clusters: ammonium NH4 +1 hydroxide OH -1 nitrate NO3 -1 chlorate CLO3 -1

Permanganate mno4 -1 sulfate SO4 -2 sulfite SO3 -2 carbonate CO3 -2 manganate mNO4 -2 phosphate PO4 -3 Steps: Sort (usually positive price on the left, negative valence on the right), list price, cross, reduce reduction, test.

As for the calculation, as long as the sum of the positive and negative valency algebra is zero, when calculating the chemical formula with an atomic group, directly use the valency corresponding to the atomic group, and if the lower right corner of the atomic group is to be marked with a number, put parentheses.

Guys upstairs, your slip is too long, and there are also sub-clans in the elements, too many. I think it's okay to memorize the first 20 elements, and then look at each main element, so you don't have to memorize so much. As for the valence, just remember a few common ones, and if you can't remember it, it's okay, just calculate it according to the sum of the positive and negative valences of zero.

The key is to do more questions, and if you do more questions, you will naturally remember them.

The third year of chemistry must be memorized as follows:I am hydrogen, I am the lightest, and rockets rely on me to carry satellites;

I'm helium, I'm a scoundrel, 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 the metal is difficult to ionize;

I am boron, black, silver and gray, and I am 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 I'm not bad, and the red light is emitted when the electricity is turned on;

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

I am magnesium, I love beauty the most, and photography fireworks shine brightly;

I happened to be aluminum, and I took a bath at room temperature and concentrated sulfuric acid;

I am 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 am sulfur, I have a long history, and I am the best at precipitating metals;

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

I am argon, the activity is poor, and the neon purple light I come to emit;

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

I am calcium, body love, bones and teeth I am there;

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 people's body in the body, and there is a mystery in the oral liquid;

I'm lead, I can store electricity, and I have me in the bullet.

36 chemical elements: hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chloride, argon, potassium, calcium. The valency of common atoms should be memorized according to the memorization formula:

monovalent potassium, sodium, fluorohydrosilver, divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, pentavalent phosphorus; Two or three iron, two or four carbon. 246 sulfur is complete, and copper mercury bivalent is the most common. There are seven cycles in the periodic table, three of which are long, three are short, and one is incomplete, and there are a total of eighteen longitudinal rows, which are sixteen tribes, of which seven are major, seven are subordinate, one is zero, and one is eight.

The Song of Valence.

Hydrogen, sodium, potassium, silver, chlorine, monovalent, divalent magnesium oxygen, barium, calcium and zinc, trialuminum, tetrasilicon, pentavalent phosphorus, ditriiron, ditetracarbon, 246 sulfur are complete, copper and mercury bivalent is the most common, and the element is zero and forever.

Note: Chlorine is negative bivalent, oxygen is negative bivalent, bivalent sulfur is negative bivalent, and the rest are positive.

The periodic table memory slips smoothly.

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

I'm helium, I'm a scoundrel, 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 the metal is difficult to ionize;

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'm fluorine, the most vicious, grab an electron and you'll be full of potatoes;

I'm neon, and I'm not bad, and the red light is emitted when the electricity is turned on;

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

I am 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 am 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 am sulfur, I have a long history, and Shenyou Maodian metal is the best;

I am chlorine, the informant is yellow and green, and I rob the metal electron;

I am 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 there;

Chemistry is a new subject in the third year of junior high school, and the following is a tongue twister I have compiled about junior high school chemistry Sakura Spine.

Tongue twisters about junior high school chemistryCommon element valencies:potassium, sodium, silver, hydrogen positive monovalent, fluorochlorobromo-iodine negative monovalent;

calcium, magnesium, barium, zinc, copper, mercury, positive bivalent, trialuminum, tetrasilicon, pentavalent phosphorus;

Two or three iron, two or four carbon. Sulfur has negative two positive four and positive six, usually oxygen shows negative bivalent, don't forget that the element is zero price.

Order of Metal Activity:Married to that beauty, the body is slender and light, a total of 100 catties (potassium, calcium, sodium, magnesium, aluminum, zinc, iron, tin, lead, hydrogen, copper, mercury, silver, platinum), part of the acid, alkali and salt solubility table.

Formula: potassium sodium ammonium salt.

Soluble, nitric acid.

Salt water is nowhere to be seen.

Barium sulfate. and silver chloride, the most insoluble test point.

Most carbonates.

and alkali, put in water does not dissolve.

Potassium, sodium, ammonium, barium, dissolved alkali, ammonia.

Volatile and easy to decompose.

Calcium hydroxide. Calcium sulfate, sulfur, silver, carbon, magnesium come slightly.

In middle school, all acids are soluble, and most volatile sulfuric acid is not.

Basic operations of chemical experiments:Solids need a spoon or paper trough, and then pour them with a hand-label.

The reading should be level with the section, low and high in the top view.

The test strip is cut small first, and the glass rod is the best for liquid testing.

The test strip is first wetted and sticks to the gas on the wild return rod.

The wine lamp is heated with an external flame, and two-thirds is the boundary.

Stir the sulfuric acid into the water without stopping, and slowly inject it to prevent boiling splashing.

Spine mask The experiment first checks the air tightness, and heats the cup and bottle through the net.

After the drainage and gas collection is completed, remove the catheter first and then move the lamp.

1.Classic hilarious tongue twisters.

2.The strongest tongue twister red carp.

3.A must-practice tongue twister every day.

4.Tongue twisters related to numbers.

5.It is super difficult to practice tongue twisters.

The third year of chemistry must be memorized as follows:I am hydrogen, I am the lightest, and rockets rely on me to carry satellites;

I'm helium, I'm a scoundrel, 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 the metal is difficult to ionize;

I am boron, black, silver and gray, and I am 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 I'm not bad, and the red light is emitted when the electricity is turned on;

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

I am magnesium, I love beauty the most, and photography fireworks shine brightly;

I happened to be aluminum, and I took a bath at room temperature and concentrated sulfuric acid;

I am 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 am sulfur, I have a long history, and I am the best at precipitating metals;

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

I am argon, the activity is poor, and the neon purple light I come to emit;

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

I am calcium, body love, bones and teeth I am there;

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 people's body in the body, and there is a mystery in the oral liquid;

I'm lead, I can store electricity, and I have me in the bullet.