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Anonymous users2024-02-06Organic substitution can also be understood as replacement.
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Anonymous users2024-02-05Iron and copper sulfate solution reaction: SikaigaoFe + CuSO4 ==FeSO4 + Cu
Zinc and dilute sulfuric acid reaction (laboratory hydrogen): Zn + H2SO4 == ZnSO4 + H2
Reaction of Sun San Magnesium and dilute hydrochloric acid: Mg + 2HCl == MgCl2 + H2 Reduction of copper oxide by hydrogen: H2 + Cuo Heating Cu + H2O charcoal also opens the original copper oxide:
C+ 2CuO High Temperature 2Cu + CO2 Methane Burns in Air: CH4 + 2O2 Ignites CO2 + 2H2O Water Vapor Passes Through the Glowing Carbon Layer: H2O + C High Temperature H2 + Co Coke Reduced Iron Oxide:
3C+ 2Fe2O3 High Temperature 4Fe + 3CO2 There is also a displacement reaction according to the order of potassium, calcium, sodium, magnesium, aluminum, zinc, iron, tin, lead, H, copper, mercury, silver, platinum, and platinum.
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Anonymous users2024-02-04You just have to memorize the three types of displacement reactions
Category 1: The reaction of active metals with acids to produce salts and hydrogen.
Category 2: Reaction of metal with salt solution to generate another salt and another metal Category 3: Reaction of reducing agent hydrogen with metal oxides, reaction of metal and water reducing agent carbon with metal oxides, formation of metal and carbon dioxide.
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Anonymous users2024-02-03Displacement reaction is one of the basic types of inorganic chemical reactions, which refers to the reaction of one element and one compound to produce another element and another compound, which can be expressed as:
a+bc→b+ac
The displacement relationship is when an element that makes up a compound is replaced by an element that makes up an element.
1. According to the category of reactants and products in the elemental substances, the displacement reaction has the following four situations:
A more reactive metal replaces a less reactive metal or hydrogen, such as:
fe+cuso4=cu+feso4
zn+2hcl=h2↑+zncl2
The more reactive non-metals replace the less reactive non-metals, such as:
cl2+2nabr=br2+2nacl
o2+2h2s=2s↓+2h2o
The displacement reaction that occurs in the solution or between gases is carried out at room temperature, and the displacement reaction between gases and solids or two solids generally needs to be carried out at high temperatures.
1. According to the type of reaction environment, there are two situations in the displacement reaction: (1) Dry state replacement.
Displacement reactions that occur between solids and solids or solids and gases under heating or high temperature conditions.
2) Wet replacement.
Displacement reaction in aqueous solution.
The replacement of metal with acid is the reaction between metal atoms and hydrogen ions in an acid solution. Such as:
zn+2hcl====zncl2+h2↑
2Al+3H2SO4 (dilute) ====Al2 (SO4)3+3H2 The replacement of metal atoms with the cations of less active metals in the salt solution is the substitution of metal atoms with cations of less active metals in the salt solution. Such as:
Cu+Hg(NO3)2====Hg+Cu(NO3)2 wet displacement follows the order of metal activity.
The displacement reaction must be a redox reaction, but the redox reaction is not necessarily a displacement reaction.
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Anonymous users2024-02-02The reaction of one elemental substance and one compound to produce another elemental substance and another compound. It is one of the basic types of chemical reactions, and displacement refers to the substitution of elements that make up elemental elements for certain elements in a compound.
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Anonymous users2024-02-01Displacement reaction, take you into the world of displacement reaction, chemistry!
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Anonymous users2024-01-31The displacement reaction in high school chemistry can be summarized into the following four types:
Metal for metal.
1) In the order of metal activity, in addition to the reactive metals of group A and A, the metal in front can displace the metal in the back from its salt solution.
2) Thermite reaction, where aluminum powder and some metal oxide powder react at high temperature. In industry, it can be used to smelt some refractory metals by thermite reaction, and can also be used to weld rails.
3) Industrial potassium: Under melting conditions, potassium chloride reacts with sodium metal to replace potassium. Because the boiling point of potassium is lower than that of sodium, potassium vapor is first volatilized from the reaction system.
Non-gold ruined shirts are non-metallic replacements.
1) Substitution reaction between halogen elements.
2) Industrial silicon: Under high temperature conditions, crude silicon is made from carbon reduction silica, and then pure silicon can be obtained by refining.
3) At room temperature, silicon and hydrofluoric acid react to produce hydrogen.
4) Ammonia and chlorine cannot coexist, and a displacement reaction will occur when they meet.
5) Fluorine gas reacts violently with water at room temperature to form hydrofluoric acid, and oxygen is released at the same time.
6) The related reaction of the more active non-metallic element replacing the sulfur element.
7) At room temperature, silicon reacts with a strong alkali solution to replace hydrogen.
8) Under the high-temperature nano cavity, carbon and water react to form water gas.
Metals replace non-metals.
1) The more reactive metals such as group A, group A, group A, etc., react with water to replace hydrogen.
2) The reaction of active metals with alcohols displaces hydrogen.
3) Active metals react with non-oxidizing strong or weak acids to replace hydrogen.
4) Aluminum metal reacts with a strong alkali solution at room temperature to replace hydrogen.
5) Magnesium metal is burned in non-metallic oxides.
Non-metallic replacement of metals.
1) The relevant displacement reaction of iron smelting in industry.
2) Under heating conditions, hydrogen can reduce iron oxide, copper oxide, etc.
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Anonymous users2024-01-301. Choose A, because the balance is still balanced, which means that the reduced mass in the beaker is equal, so the H2 released is equal, so it can only be that the hydrochloric acid is consumed.
2. The pointer is biased to the side where MG is placed.
Reason [2 parts of hydrogen are generated for every 56 parts of iron, and 2 parts of hydrogen are produced for every 24 parts of magnesium, so when producing hydrogen of the same mass, more iron is consumed, and the natural balance is biased towards magnesium].
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Anonymous users2024-01-29A reaction in which one element and one compound react to produce another new element and another new compound. For example, Zn+H2SO4=ZnSO4+H2
In this reaction, there is only the electron gain and loss of nitrogen element, the valency has risen and decreased, so C is wrong, the increase of nitrogen in metadimethylhydrazine is oxidized, it is a reducing agent, so a is wrong, the reaction is the recombination of atoms, so there is an endothermic and exothermic process, C is wrong, D is left, of course, there are eight electrons transferred from two N2O4 to N2 D is correct.
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