Seek help!!! Organize chemical data

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Avogadro's Law.

At the same temperature and pressure, the volume ratio is equal to the ratio of the number of molecules.

Container A is filled with NH3 and container B is filled with CH4

If an ammonia molecule has 4 atoms, and a methane molecule has to be equal to 5 atoms, it has to be guaranteed that their number ratio is 5:4, so the volume ratio is 5:4

It should be said that the clan is the first one that is generated together.

It is Fe(2+)+2NH3·H2O=2NH4(+)Fe(OH)2 Cu(Hengqin 2+)+22NH3·H2O=2NH4(+)Cu(OH)2

Later 4Fe(OH)2+O2+2H2O=4Fe(OH)3

1. Does oxygen help in combustion. Oxygen helps the sparkled strip to rekindle, then oxygen promotes combustion;

2. Is oxygen heavier than air. There is oxygen in the gas cylinder with the bottle mouth up and the bottle mouth downward, because the wooden strip with sparks in the gas bottle with the bottle mouth up burns more vigorously than the gas cylinder with the bottle mouth downward, then it means that the oxygen is more in the gas cylinder with the bottle mouth upward, which should be heavier than the air, so in the gas cylinder with the bottle mouth downward, the oxygen runs away.

1. The same reaction process as Al reacts with sodium hydroxide to generate sodium metaaluminate, which is first reacted with water to form aluminum hydroxide, which is a small reaction, and then aluminum hydroxide and strong alkali, that is, a high concentration of OH-solution, form sodium metaaluminate, and aluminum hydroxide dissolves, so that the reaction between alumina and water can also be accelerated.

Therefore, the reaction between alumina and sodium hydroxide will form an aluminum hydroxide precipitate, but then dissolve.

2. Look at the definition of catalyst, the quality and chemical properties of the catalyst do not change after the reaction, and the actual catalyst participates in the reaction, but it is regenerated at the end of the reaction, so that the physical properties usually change. For example, the spatial configuration of the catalyst changes, and the simplest crystal becomes a powder.

3，h++alo2-+h2o=al(oh)3=al3++3oh-

The first problem: no aluminium hydroxide precipitates are generated. Alumina + sodium hydroxide = sodium metaaluminate + water. Sodium metaaluminate becomes an aluminium hydroxide precipitate only under weakly acidic conditions.

The second problem: neither the mass nor the chemical properties change. Physical properties may change, for example, from lumps to powders.

The third question: metaaluminic acid corresponds to aluminum hydroxide. It is produced by acid ionization of aluminum hydroxide.

1. No, sodium metaaluminate will be generated directly.

2. It may change.

3. Metaaluminate should correspond to acid ionized aluminum hydroxide.

No, Al2O3 + 2NaOH = 2Naalo2 + H2O

Won't change. Didn't understand ......

A small amount will, an excess will not.

I don't know what to do without me.