The mastery of chemical equations in senior high school is not to memorize as much as possible, but to classify and grasp the reaction principle of each kind, from the outside to the inside, from the shallow to the deep, from the individual to the general. Here, they are classified as follows:

(a) inorganic aspects are

(1) Four basic reactions: combination, decomposition, substitution and metathesis.

(2) Redox reaction: intermolecular redox reaction, intramolecular redox reaction, disproportionation reaction and final reaction, for example, zinc reacts with dilute hydrochloric acid, potassium chlorate is heated to generate oxygen, and chlorine gas is introduced into calcium hydroxide solution to generate bleaching powder, hydrogen sulfide and sulfur dioxide (corresponding to one example according to the above classification).

(3) Ion reaction: the reaction between ions, and the metathesis reaction between acid, alkali and salt must obey the condition that the metathesis is carried out to the end. Reactions between ions and molecules; For example, the reaction between chlorine and iodine ion, and the reaction between sulfide and acid, alkali and salt. A reaction between ions and electrons, such as hydroxyl ions losing electrons at the anode. An electrolytic reaction in an aqueous solution, for example, electrolysis of an aqueous solution of sodium chloride to produce hydrogen and chlorine. Coordination reaction in aqueous solution.

(4) Hydrolysis reaction of salt: hydrolysis of strong acid and weak base salt, hydrolysis of strong base and weak acid salt, hydrolysis of weak acid and weak base salt, double hydrolysis reaction, etc.

(5) Reversible reaction and movement of reversible equilibrium.

(6) exothermic reaction and endothermic reaction.

(2) the organic reaction is

(1) substitution, addition, organic redox, intramolecular dehydration, intermolecular dehydration, polymerization (polyaddition and polycondensation), halogenation, sulfonation, nitration, cracking, elimination, completion, hydrolysis, esterification, color development, high temperature dry distillation, hydration, etc. We must master the principle of each reaction, the characteristics of each substance, the conditions of each reaction, and the reactions between them, and study the inevitable laws between them.

The comparative foundation of junior high school and middle school basically needs to be memorized, and it is ok not to attend classes or read books.

But high school is different. First of all, you must listen to the teacher when you go home, follow the teacher, trust the teacher and review your lessons. Chemistry is a liberal art in science, and it also needs to be memorized.

Second, pay attention to accumulation, that is, accumulate problems, do more problems, and practice makes perfect.

Third, if you don't understand, you must ask, which is very important ~ ~ ~ Learn more chemical formulas and discover their laws.