Find out what you need to memorize in chemistry learning in junior high school

The equation valence metal activity sequence table and water solubility must be memorized, and more importantly, some matters about the experiment, pay attention to the problems, remember the chemical and physical properties of some substances, in fact, there are not many substances such as oxygen, water, hydrogen, acid and alkali salts, carbon dioxide, carbon monoxide, iron, copper, not much, but also remember some reactions with precipitation and bubbles, and memorize experimental phenomena. Calculation, the usual exam should not be difficult, the equation must be memorized, do not memorize what you answer, in fact, it is not difficult to memorize, there are rules, memorize to know the rules, remember rote memorization, so remember not to remember! In fact, everything is the same, which means that you have not mastered the basic knowledge, and you still need to do more questions in chemistry.

What do you say you want to add, or according to the equation and the properties of matter. Junior high school chemistry has nothing to do with IQ, it depends on whether you are serious or not, whether you are careful or not, I think junior high school chemistry is like English, you have to accumulate, you have to memorize, there is nothing difficult, believe in yourself! Of course, high school chemistry is on par, and that requires a high-IQ mind!

In short, back to back. Do the questions, do the questions, understand the comprehension, understand the comprehension!! It's really not good, one-on-one, there isn't much chemistry in junior high school.

If you have the heart to learn chemistry, you can do a lot of questions, record the mistakes in the properties of this substance in the error book, and turn it out when you read it in the morning and evening, and it's almost the same.

Summary. Hello, junior high school chemistry physics needs to memorize 1Balance Measurement Quality [Experimental Purpose] Measure quality with a tray balance.

Experimental equipment] balance (tray balance). 【Experimental Procedure】1Place the balance on a level table and remove the rubber gaskets from both ends.

2.The code is moved to the leftmost zero tick of the ruler (the code is zeroed and the leftmost end of the code is aligned with the zero tick mark). 3.

Adjust the balance nuts at both ends (if the left disc is higher, the balance nut is screwed to the left; The same goes for the right disc) until the hand points to the dial** and the balance is levelly balanced. 4.Left and right until the balance is rebalanced.

Addition and subtraction of weights or mobile travel codes) 5When reading, the mass of the measured object = weight mass + the number of the code (m object = m weight + m swim) [experimental record] The mass of this object is shown in the figure: 62 g2

Spring dynamometer force measurement [Experimental purpose] Use spring force gauge to measure force [Experimental equipment] fine wire, spring dynamometer, hook code, wooden block.

Hello, junior high school chemistry physics needs to memorize 1Balance Measurement Quality [Experimental Purpose] Measure quality with a tray balance. Experimental equipment] balance (tray balance).

【Experimental Procedure】1Place the balance on a level table and remove the rubber gaskets from both ends. 2.

The code is moved to the leftmost zero tick of the ruler (the code is zeroed and the leftmost end of the code is aligned with the zero tick mark). 3.Adjust the balance nuts at both ends (if the left disc is higher, the balance nut is screwed to the left; The same goes for the right disc) until the hand points to the dial** and the balance is levelly balanced.

4.Left and right until the balance is rebalanced. Addition and subtraction of weights or mobile travel codes) 5

When reading, the mass of the measured object = weight mass + the number of the code (m object = m weight + m swim) [experimental record] The mass of this object is shown in the figure: 62 g2Spring dynamometer force measurement [Experimental purpose] Use spring force gauge to measure force [Experimental equipment] fine wire, spring dynamometer, hook code, wooden block.

I'm about to take the high school entrance exam, and I need to memorize these two subjects to quickly improve my score.

Hello, physical formulas and chemical equations.

After two months, can the child still improve?

Hello, yes, junior high school knowledge can be improved by memorizing more.

The chemistry teacher tells you that don't learn chemistry by rote, the last bit of interest in learning is gone, it's too painful, and it is still very easy to understand that learning chemistry is still very easy, and it is still very simple to score more than 70 points in chemistry in the high school entrance examination.

I think chemistry is purely memorable, and there are only three parts:

1. Element symbols, this must be like learning a foreign language to first recognize the 26 English letters, there are 2 requirements for the memory of element symbols, the elements 1-20 in the periodic table should be memorized in order, five to five, it is very easy; Metal activity order is memorized in order: potassium, calcium, sodium, magnesium, aluminum, zinc, iron, tin, lead, hydrogen, copper, mercury, silver, platinum.

Second, the valence of common elements, give you a formula, there are many formulas, I am used to teaching my students this:

Monovalent potassium, sodium, silver chloride, divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, pentavalent phosphorus, ditriiron, ditetracarbon, and 246 sulfur are complete, and copper and mercury are the most common. Negative hydroxide nitrate, negative dicarbonate sulfate, and positive monovalent ammonia.

3. The writing of the five common atomic groups in junior high school is available on page 83 of the textbook, and it is more troublesome to fight without fighting.

The third year of junior high school is the first time that students are exposed to chemistry, first of all, it is not particularly difficult to determine that junior high school chemistry is the primary stage of chemistry, and second, it is not particularly difficult to determine that chemistry belongs to mathematics, physics and chemistry, so do not memorize it. You should get used to the method of learning mathematics to treat chemistry, pay attention to the lecture in class, the teacher will speak very clearly, and pay attention to the class notes, if you want to memorize, there are only chemical equations and periodic tables of chemical elements, but the latter is slowly mastered in the study of the former, and work hard.

LZ, you're not learning the right way! If you can't listen to the teacher, you can remember what you say! In class, you should listen attentively to the content of the teacher and understand, but if you don't have time to understand and take notes, then you have to give up your notes!

Attention, this is a must! The understanding of the content comes first, and the rest is secondary! If you understand completely (generally speaking, if you listen carefully in class, it is extremely efficient), you can even summarize the notes yourself after the class.

It's the LZ that keeps you rushing to take notes that you miss what you should be listening to. Of course, you really care about notes and think they are important, so ask your classmates or teachers after class, but don't let your notes delay your learning points. I can give you a very absolute word:

As long as you understand 100% and master it, you can get a high score if you don't take notes (it should be above 94 points in the high school entrance examination). Since LZ is one of those who can memorize with their hearts, if you can improve your learning methods, it is not a problem to get a high score!

Periodic table + chemical equations.

Some of the main points to learn.

1: Be sure to memorize the periodic table and the symbols of the elements, and you will definitely pass the exam. 2: Back valence, ionic roots, ionic clusters. 3. Learn the substances produced by oxygen and other elements, 4. Write chemical formulas and 5. Learn to calculate chemical equations.

The most basic element symbols chemical formula valency are the most important knowledge and reactions related to acids and bases.

The most important thing is to read the textbook, for junior high school and high school chemistry, the textbook is king, the chemical equation, the properties of each element, when you are very familiar with the textbook, and even know which knowledge point is on which page, your chemistry will be almost learned.

The reaction phenomena that appear in the book, the chemical equations, the symbol of element No. 20, the color of the substance, the properties of the acid-base salts.

Memorize all the text formulas that appear in junior high school books, chemical formulas, chemical equations, valency I think that's probably it.

There is a common name: dry ice (carbon dioxide) CO2

Aeruga (basic copper carbonate) Cu2(OH)2CO3

Acetic acid (acetic acid) CH3COOH

Caustic soda, caustic soda, caustic soda (sodium hydroxide), Naoh, quicklime (calcium oxide), cao, slaked lime, slaked lime (calcium hydroxide), Ca(OH) 2

Soda ash, soda (sodium carbonate).

na2co3

Baking soda (sodium bicarbonate) naHCO3

Rust (iron oxide) Fe2O3

Hydrogen peroxide (hydrogen peroxide) H2O2

Commonly used element symbols and structural graphics and simple chemical reaction formulas and formula balancing.

Chemical terms, names and symbols of common elements and atomic groups, non-metals: o oxygen h hydrogen n nitrogen cl chlorine c carbon p phosphorus s sulfur, metal, k potassium ca calcium na sodium mg magnesium al aluminum zn zn zinc fe iron cu copper hg mercury ag silver mn manganese ba barium, atomic clusters (roots): hydroxide, nitrate, carbonate, sulfate, phosphate, ammonium.

The main thing is to read the textbook, for junior high school and high school chemistry, the textbook is king, the chemical equations, the properties of the elements, when you are very familiar with the textbook, and even know which knowledge point is on which page, your chemistry will be almost learned.

3.You can read the textbooks for the common chemical formulas in junior high school, and find the most frequent chemical formulas in them, which are precipitation in general chemical equations.

4.If there is no precipitated gas in the reactants, this is because it is difficult to observe the changes of substances in general chemical reactions, but if there is precipitated gas, it can be easily observed and has particularity.

5.Common elemental valence formulas, monovalent hydrochloride, potassium, sodium, silver, divalent oxygen, calcium, barium, magnesium, zinc, tripentanitrogen, phosphorus, trivalent aluminum, copper, mercury, 12, iron, tri, 2, 4, hexasulfur, 4 valence, many elements have valence, different conditions and different valences.

6.Common atomic clusters (roots) chemical valence formulas, monovalent hydroxide nitrate, divalent carbonate sulfate, trivalent common phosphate, usually negative valence ammonium removal, proficient in dictation of common elements of commonly used valence.

Chemical equations, general definition.