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Anonymous users2024-02-07Acid and salt reactions.
Acid and base reactions.
Acids and metal oxides react.
Acid rain metal (some metals) reactions.
Alkali and alkaline reactions.
Alkali and salt reactions.
Alkali and non-metal oxide reactions.
Salt and salt reactions.
Salts and metals (partially metals) react.
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Anonymous users2024-02-06There is a summary of junior high school chemistry equations that you can check out.
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Anonymous users2024-02-05The chemistry equation in the first semester of the third year of junior high school is as follows:1. Copper is heated in air: 2Cu+O2=2CuO.
2. Iron burns in oxygen: 3Fe + 2O2 ignition = Fe3O4.
3. Chemical reaction, magnesium combustion in air: 2mg + O2 ignition = 2mgo.
4. Aluminum burns in air: 4Al+3O2 ignition = 2Al2O3.
5. Insufficient combustion of charcoal in the air: 2C + O2 ignition = 2CO.
6. Methane burns in air: CH + 2O2 ignition = CO2 + 2H2O.
7. Alcohol burns in the air: C2H5OH+3O2 ignition = 2CO2+3H2O.
8. Reaction of zinc and dilute sulfuric acid (laboratory H2): Zn+H2SO4=ZnSO4+H.
9. Reaction between zinc and dilute hydrochloric acid: Zn+2HCl=+ZnCl2+H2.
10. Magnesium and dilute hydrochloric acid reaction: mg+2HCl=mgCl2+H2.
11. Coke reduced iron oxide: 3C + 2Fe2O3 high temperature = 4Fe + 3CO2.
12. Hydrogen reduction copper oxide: H2+CuO heating = Cu+H2O.
13. Heating potassium permanganate: 2kmNO4 heating = K2mNO4 + MNO2 + O2.
14. High-temperature calcined limestone (industrial method for producing carbon dioxide): CaCO3 high temperature = Cao + CO2.
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Anonymous users2024-02-04The first three excerpts of the chemical equation include the reaction of carbon dioxide and water, the reaction of quicklime dissolved in water, and the reaction of anhydrous copper sulfate as a desiccant.
Carbon dioxide and water reaction (carbon dioxide into purple litmus solution): CO2+H2O===H2CO3.
Quicklime is soluble in water: CaO+H2O===Ca(OH)2.
Anhydrous copper sulfate as Kaisui desiccant: CuSO4 + 5H2O === CuSO4 5H2O.
Carbonic acid is unstable and decomposes: H2CO3===H2O+CO2.
Iron and copper sulfate solution reaction: Fe+CuSO4==FeSO4+Cu.
Sodium hydroxide solution reacts with copper sulfate solution: 2NaOh + CuSO4 ==Cu(OH)2 + Na2SO4.
Definition and types of chemical reactions:
A chemical reaction is the process by which one or more substances (also known as reactants) are transformed into products that are different from reactants through chemical changes. Chemical change is defined as when one molecule comes into contact with another to form a large molecule, or when a molecule breaks apart to form two or more small molecules, or when atoms within a molecule reassemble.
There are four types of chemical reactions: chemical reactions, fractional decomposition reactions, displacement reactions, and metathesis reactions.
A chemical reaction is a reaction in which two or more substances produce another substance. A decomposition reaction is a reaction in which one substance produces two or more other substances. The displacement reaction is a reaction in which one element reacts with one compound to produce another element and another compound.
The metathesis reaction is a reaction in which two compounds exchange components with each other to produce two other compounds.
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
The first is the substitution of salt solutions, as long as one metal is found to be more active than another, for example: >>>More
1) cyclohexane + Cl2 --- light ---monochlorocyclohexane + HCl2) monochlorocyclohexane + NaOH ---ethanol, heated --- cycloethylene + NaCl + H2O >>>More
1. 170g has been decomposed with a mass fraction of 14%.
2, if memory serves, it is 40. The mass fraction is approximately equal to 72%. >>>More
The formula that uses chemical symbols to represent chemical reactions is called a chemical equation. >>>More