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Anonymous users2024-02-07That's too much. Speechless.
There will be a final exam explanation in the third year of high school. The knowledge points are very detailed.
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Anonymous users2024-02-06High School Chemistry Knowledge Points:1. Valency (valency of common elements):
Alkali metal elements: ag, h: +1 f:—1.
ca、mg、ba、zn：+2 cl：—1，+1，+5，+7。
cu：+1，+2 fe：+2，+3 o：—2 s：—2，+4，+6。
al：+3 mn：+2，+4，+6，+7 p：—3，+3，+5 n：—3，+2，+4，+5。
2. Redox reaction.
Definition: A reaction in which there is electron transfer (or valence rise).
Essence: Electron transfer (including gains, losses and shifts of electrons) Characteristic: Rise and fall of valency.
Oxidizing agent (oxidizing) - electrons obtained - valency decreased - reduced - reduced product.
Reducing agent (reducing) - loss of electrons - increase in valency - oxidized - oxidation products.
Formula: Rise - Loss - (Being) Oxidation - Reducing Agent Drop - Gain - (Be) Reduction - Oxidant.
3. Metal activity sequence table.
k、ca、na、mg、al、zn、fe、sn、pb、cu、hg、ag、pt、au。
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Anonymous users2024-02-051. High and high chemical valency formulas (1) Monovalent potassium, sodium, silver, hydrogen chloride, divalent oxygen, calcium, barium, magnesium, zinc, trialuminum, tetrasilicon, pentanitrogen phosphorus, di-iron, 24-carbon, 24-6 sulfur are complete, copper, mercury bivalent are the most common, minus 1, hydroxide, nitrate, minus disulfate, negative 3, remember phosphate, positive monovalent is ammonium 2, high and high chemical valency formulas (2) potassium, hydrochloride, sodium, silver, positive monovalent; Calcium, barium, magnesium, zinc, positive bivalent, trialuminum, tetrasilicon, pentazogen, phosphorus; 23 iron, 244 carbon, 246 sulfur are all Qi; Copper is most commonly bivalent. The zero price of the element will never change; Chlorochlorobromoiodine negative monovalent. 3. High and high chemical valency formulas (3) Fluorochlorobromide, potassium iodine, sodium, silver, cuprous hydrogen, mercury oxygen, iron, magnesium, calcium, barium, tungsten, manganese, aluminum, copper, bivalent zinc, trivalent iron, phosphorus and aluminum, tetravalent carbon, silicon, pentavalent phosphorus, sulfur valence, 246, 2467, manganese is particularly cooked.
4 What is the use of high chemical valency When the elements are combined with each other, the ratio of the number of reactant atoms is always constant. For example, one sodium must be bound to one chlorine. And one mg must be combined with 2 chloro.
If it were not for this number ratio, the anions and cations that make up ionic compounds and the outermost electron shells of atoms that make up the molecules of covalent compounds would not be stable structures. It is not possible to form stable compounds. And because the atom is the smallest particle that cannot be separated in a chemical reaction, when the elements are combined with each other to form a certain compound, the number of atoms of each element must be a certain simple integer ratio.
The concept of valency comes from this, then the number of atoms of an element that are mutually combined determines the valency of this element, and the valency is set to facilitate the representation of the number of atoms that are mutually combined.
You go to this ** look, there's a lot of it!
There are 8 books in the human education version, which are compulsory: >>>More
The knowledge points of high school math functions are as follows: >>>More
The equation in your book must be like this: 2h2(g) +o2(g) = 2h2o(l), right? >>>More
It depends on what stage you are. In middle school chemistry, students are the basics of elemental chemistry (including the periodic law, alkali metals, alkaline earth metals, non-metallic elements and subgroups of chromium, manganese, iron, copper, zinc, silver, mercury and other elements), structural chemistry (molecular structure and chemical properties, coordination compound structure, crystal chemistry basics, etc.), physical chemistry basics (including chemical thermodynamics, chemical kinetics, catalysis, electrochemistry, etc.), organic chemistry basics (common small molecule organic matter and polymer knowledge), Experimental chemistry (laboratory rules, knowledge and use of instruments, principles of experiments, design of experiments, etc.). For undergraduates, basic inorganic chemistry (periodic law and the properties, reactions, structures, etc. of all elements), organic chemistry (definition, properties, structure, synthesis, reaction mechanism of organic small molecules, etc.), physical chemistry (chemical thermodynamics, chemical kinetics, catalysis, interface, electrochemistry, etc.), experimental chemistry (undergraduate students are required to enter the laboratory, and most middle schools in China do not open laboratories at the middle school level).