Chemical Reaction of Oxygen and Hydrogen

2H2+ O2=2H2O

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2H2+ O2=2H2O

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2H2+O2=2H2O

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What can be produced by a chemical reaction of hydrogen with oxygen in the air after ignition? How to verify the conjecture by experiment?

Hydrogen and oxygen generate water, H2O, after ignition of hydrogen, glass sheet is placed above the flame, small water droplets can be observed.

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12. Volume ratio of oxygen to hydrogen in electrolysis of water? In the experiment of electrolytic water, the gas volume in the negative scale tube connected to the power supply is _____, and the gas volume in the positive scale tube connected to the power supply is _____, and the ratio of them is about ______. Volume ratio of oxygen to hydrogen in electrolysis of water? In the experiment of electrolytic water, the volume of gas in the negative scale tube connected to the power supply is _____, and the volume of gas in the positive scale tube connected to the power supply is _____, the ratio of which is about ______.
13. Why does the positive electrode produce oxygen and the negative electrode produce oxygen and the negative electrode hydrogen? The answers are very different ~
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15. When electrolyzing water, the bulk of the product is small, and the experiment proves that what can be separated and what can not be separated in the chemical reaction When water is electrolyzed, what is large and what is small and the experiment proves that what can be separated and what can not be separated in the chemical reaction
16. The reaction of electrolytic water shows that the essence of chemical reaction is.
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20. Why the volume ratio of oxygen and hydrogen produced by water electrolysis is related to the ratio of hydrogen atom and oxygen atom constituting water