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1. Understand the nature of the reaction, the properties of the atoms, the arrangement of electrons outside the nucleus, and the properties of chemical bonds. This is a general rule for dealing with the main element, with the exception of the subfamily. This point is an inorganic reaction.
2. It is still the nature of the reaction, the properties of organic functional groups, such as hydroxyl group, carbonyl group, carboxyl group, double bond and triple bond properties (this point can be classified as chemical bond), etc. For organic reactions.
3. Summarize the physical properties, reaction phenomena, and reaction conditions of substances, and analyze why these phenomena occur through phenomena and different reaction conditions.
4. Reserve the above points, the chemical reaction equation does not need to be memorized, and individual reactions are very complex, you may wish to figure out the reaction process.
You can master the trimming method of chemical equations, this is a skill, you may wish to reserve more, this can be remembered.
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Chemical equations cannot be memorized, they are very regular, we must recognize the essence of the reaction and then remember, for example, acid-base neutralization is H+ and OH- to generate H2O, so some reactions can be written without learning. You need to observe and ponder a lot Chemistry is very interesting.
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Memorizing equations doesn't mean that you have to memorize one when you encounter one, so how much you have to memorize is enough. There is a rule, you have to remember what kind of characteristics each type of reaction has, what type of matter reacts, and what type of substance is generated. By memorizing these rules, you can basically solve most of the problems of writing equations, except for a few very special ones that need to be memorized.
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Chemical equations are not memorized by rote, but by finding the rules yourself. Find out the essence of the reaction and then perform a simple balance. Have faith.
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Figuring out the types, categorizing and understanding, no need to memorize.
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1. Remember the laws followed by the chemical equation, that is, the principle of mass balance, atomic balance, gain and loss charge balance, and the principle of proximity of valence of the product, and then remember the reactants and products of the chemical equation.
2. Pay attention to understanding, and at the same time pay attention to what kind of reaction conditions (temperature, concentration, pressure, etc.) have chemical equations, different reaction conditions will have different reaction equations.
3. Learn to balance chemical equations, master simple balancing methods, and practice more in ordinary times, which can enhance memory and avoid forgetting chemical equations during the exam.
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Chemical equations cannot be done by rote memorization, and it is very difficult for us to grasp the essence of chemistry when we learn chemistry.
What is Chemistry? The science that studies the laws of change in matter!
Therefore, when learning chemistry, we must always remember the essence of chemistry, that is: how matter changes, the law will never change, and the same is true of equations.
I take an esterification reaction equation in organic chemistry as an example: acetic acid + ethanol to generate ethyl acetate, this reaction belongs to esterification reaction, the law is acid dehydroxyl, alcohol dehydrogenation of the element, then ch3cooh + ch3ch2oh ==== ch3cooch2ch3 +h2o in the future, no matter what acid, what alcohol is written according to the law.
Another example: Halogenated hydrocarbons are eliminated, and ethyl chloride is eliminated: Halogenated hydrocarbons are removed from halogenated hydrocarbons, carbon atoms connected to halogen atoms, adjacent carbon atoms are removed from hydrogen atoms, two atoms are combined to form acids, and a pair of bonds are formed in the middle of the halogenated hydrocarbons, and the combined acids and bases react to form corresponding salts.
Okay, ethyl chloride, propylene chloride, vinyl chloride, don't you know how to write?
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Chemical equations are not memorized, they are skillful (in junior high school, there are few equations and they are very simple, you can rely on memorization alone).
When you get to high school, you'll have skills.
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First of all, you must memorize the text formula, then you must be able to write the correct chemical formula according to the text formula, and then remember the reaction conditions, and you can add gas and precipitation symbols.
Several basic laws of chemical reactions, the law of conservation of mass, the law of conservation of atoms, the law of conservation of energy, these three laws are all introduced in your textbooks, and I won't talk nonsense here. >>>More
Chemical equation.
It is a formula in which the equation is equal to the left (or arrow) of each reactant and the right is the chemical formula of each product. For example, hydrogen and oxygen react to produce water >>>More
You don't need to memorize a lot of chemical formulas, you can do the problem according to the gain and loss of the electrons of the element, I recommend that you can write ion equations as much as possible to write ions, that is the essence of chemistry. >>>More
1) cyclohexane + Cl2 --- light ---monochlorocyclohexane + HCl2) monochlorocyclohexane + NaOH ---ethanol, heated --- cycloethylene + NaCl + H2O >>>More
Conservation of electric charge. Manganese changes from 7-valent to 2-valent, giving five electrons. The oxygen in hydrogen peroxide changes from negative 1 valence to 0 valence oxygen, losing two electrons. >>>More