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Anonymous users2024-02-07Hydrogen - zinc + sulfuric acid (oxidizing and flammable gas).
Carbon dioxide – calcium carbonate + dilute hydrochloric acid (cannot be burned and does not support combustion).
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Anonymous users2024-02-06Hydrogen: Zn+H2SO4===ZNSO4+H2 (with sexuality, flammable) Oxygen: 2H2O2===2H2O+O2 (with oxidizing and combustion) 2kmNO4===K2MNO4+MNO2+O2 2KCLO3===2KCl+3O2
Carbon dioxide: CaCO3 + 2HCl = = = CaCl2 + H2O + CO2 (cannot be burned and does not support combustion).
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Anonymous users2024-02-05Zn+H2SO4==H2 flammable gas, light blue flame, reducible, insoluble in water.
2 H2O2==(MnO2 Catalysis) O2(G)+H2O2 KmNO4==(Heating) K2Mno4+O2(G)+Mno22 Kclo3==(Mno2 Catalytic Heating) 2 KCl+3 O2(g) has strong oxidation, can support combustion, gas density is greater than air, insoluble in water (better than hydrogen) CaCO3+2 HCl==CO2(g)+CaCl2+H2O can not be burned and does not support combustion, the density is larger, gas, Soluble in water (volume 1:1) soluble in water and acidic (pH = when saturated
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Anonymous users2024-02-04Carbon dioxide production: CaCO3 + 2HCl = CaCl2 + H2O + CO2 Oxygen production: 2H2O2 2H2O+ O2 2kmNO4 K2Mno4 + Mno2 + O2
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Anonymous users2024-02-03Junior High School Chemistry - Carbon dioxide produced in the laboratory.
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Anonymous users2024-02-02Junior High School Chemistry - Carbon dioxide produced in the laboratory.
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Anonymous users2024-02-01Hydrogen: *Reactive metals and hydrochloric acid. For example: Zn+2HCl==H2+ZnCl*Magnesium strips and ammonium chloride. mg+2nh4cl+2h2o==mgcl2+2nh3·h2o+h2↑
Electrolysis of water. 2h2o = (energized) = 2h2 +o2 oxygen: junior high school textbooks have: pyrolysis of potassium permanganate.
Hydrogen peroxide pyrolysis.
Pyrolysis of potassium chlorate (catalyzed by manganese dioxide).
Carbon dioxide: pyrolysis of calcium carbonate.
Carbon ignites in oxygen.
Calcium carbonate is added to hydrochloric acid.
**Applies to reactions with *.
1) When producing carbon dioxide, there are certain requirements for drugs, and sodium carbonate cannot be selected for solids, because it reacts too quickly with acid, and blocks of marble or limestone are generally selected; The liquid is generally dilute hydrochloric acid, and concentrated hydrochloric acid is not selected, because concentrated hydrochloric acid has strong volatility, so that the prepared carbon dioxide is not pure, and sulfuric acid cannot be selected, because when sulfuric acid reacts with calcium carbonate, the calcium sulfate generated is slightly soluble in water, and when a large amount of calcium sulfate is generated, calcium sulfate becomes a solid precipitate and adheres to the surface of the marble, thereby preventing the further progress of the reaction, so calcium carbonate and dilute hydrochloric acid are used for medicine; >>>More
Ca(OH)2+CO2=CaCO3 (precipitation) + H2O2CaCO3+CO2+2H2O=2Ca2+ +4(HCO3)- The separation is above, and the synthesis of one is the bottom: >>>More
The chemical formula of carbon dioxide is: CO2. A carbon dioxide molecule is composed of two oxygen atoms and one carbon atom through covalent bonds, and is a colorless and odorless gas at room temperature, with a greater density than air, soluble in water, does not support combustion, and reacts with water to form carbonic acid. >>>More
CO2 fire extinguisher.
Valid for up to 12 years, water-based fire extinguishers. >>>More
Sodium peroxide reacts with carbon dioxide to form sodium carbonate and oxygen by the equation: 2Na2O22CO2 >>>More