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What determines the valence of a metal element?
Determined by the number of extra-nuclear electrons. The number of extra-nuclear electrons that combine together determines the valence of the element. The valence is set to indicate the number of atoms that combine together. When you learn the valence, you should know the valence of the elements in the compound.
After sulfur dioxide is introduced into acidic potassium permanganate, the solution is discolored.
5SO2+2(MnO4-)+2H2O=5(SO42-)+2(Mn2+)+4(H+)
RELATED INFORMATIONS
- 1. Does the solubility of AgCL in KNO3 solution change at room temperature
- 2. How to write copper sulfate ion?
- 3. TRANSFORMATION RELATIONSHIP BETWEEN ALUMINIUM IONS, ALUMINIUM HYDROXIDE AND METALUMINIUM IONS There is a chemical equilibrium among aluminum ions, aluminum hydroxide and metaluminate, but I don't know the specific relationship between them. For example,1mol aluminum ion reacts with 3mol hydroxide ion to form aluminum hydroxide, but if hydrogen ion is excessive, metaluminate ion is formed.
- 4. ON THE PROBLEMS OF METALUMINATE AND CARBON DIOXIDE Why the excess CO2 in the solution with metaaluminate can only generate aluminum hydroxide rather than aluminum trivalent ion? If it is excessive, it should be aluminum trivalent ion If there is enough carbonic acid, there should be enough H+ ions
- 5. REACTION MECHANISM OF DIHYD and Carbon Dioxide? Reaction Mechanism of Dihydrolysis of Metaluminate and Carbon Dioxide?
- 6. Does CO2 react with hydroxide or aluminate first
- 7. Reaction of metaaluminate with hydroxide ion Reaction of Metalumino and Hydroxyl Ions
- 8. Sequence and reason of reaction of hydroxide, aluminum ion, ammonia and aluminate The sequence and reason of the reaction of hydroxide, aluminum ion, ammonia and aluminate
- 9. Reaction of Metalumina with Aluminum Ion Reaction of Metaluminate with Aluminum Ion
- 10. Which one reacts first when the hydrogen ion encounters both hydroxide and metaaluminate ions? -_-.sorry! It's magnesium hydroxide.
- 11. Reaction equation of ethylene propylene and chlorine gas.
- 12. Under certain conditions, the chemical equation for the reaction of ethylene and propylene in the molar ratio of 1:1 to produce polyethylene is the solution.
- 13. What does calcium hydroxide + calcium carbonate produce
- 14. Solubility of AgI in water is 2.1×10-6g/L. Solubility product Ksp of saturated solution of AgI is obtained C=(2.1×10-6)/235=8.94×10-9mol/L Why is C equal to S/M? Look out for confusion
- 15. Can the chemical reaction equation of acetylene to ethane be written in one step? ... Is the reaction of methane and chlorine in light a four-step one? Can the chemical reaction equation of acetylene to ethane be written in one step? ... Can the reaction of methane and chlorine in light be four steps in one?
- 16. Do a fountain experiment with a flask full of ammonia when water fills the entire flask When the flask is filled with water and not filled with water, which ammonia substance is in high concentration and why
- 17. Flask filled with ammonia gas under standard conditions, inverted in water, filling the flask with water, if the ammonia gas is dissolved in the flask, the concentration of the substance of the resulting ammonia water Flask filled with ammonia under standard conditions, inverted in water, filling the flask with water, if the ammonia is dissolved in the flask, the concentration of the substance of the resulting ammonia water
- 18. Fountains Experiment I The mass concentration of ammonia in the flask filled with 1/2 air and 1/2 ammonia is
- 19. Under standard conditions, three dry flasks are filled with pure ammonia, air and HCl in equal volume mixed gas, NO and O2 in volume ratio of 4 Under standard conditions, three dry flasks are filled with: dry pure NH3, HCl gas containing half air, mixed gas of NO2 and O2[ V (NO2)∶V (O2)]=4∶17. The fountain experiments were then performed separately, and the ratio of the mass concentration of the solution obtained in the three flasks was () A.2∶1∶2 B.1∶1∶1 C.5∶5∶4 D.
- 20. Under standard conditions, three dry flasks are filled with dried pure NH3, HCl gas containing half of the air, NO2 and O2 Under standard conditions, three dry flasks are filled with: dry pure NH3, A mixture of HCl gas, NO 2 and O 2 with half air [V (NO 2)∶V (O 2)]=4∶1. The fountain experiments were then performed separately, and the ratio of the mass concentration of the solution obtained in the three flasks was () A.2∶1∶2 B.1∶1∶1 C.5∶5∶4 D.