Junior 3 Chemistry Urgent Junior 3 Chemistry, Urgent

It is cesium hydroxide, which has all the properties of alkali metals:1Can be reflected with indicators, 2Reaction with acidic oxides, 3Reaction with acid, 4Reacts with hydrolyzed acidic salts.

The equation is the same as that of sodium hydroxide, but it is enough to turn Na into CS. Elemental cesium has strong metallicity, is not radioactive of all the elements of the strongest metallic, if it is put into water, its power is much more powerful than sodium metal in water.

There is a general property of alkali.

1. It can make the litmus test solution blue, and can make the phenolphthalein edge red.

2. It can react with acid to form water and corresponding salts.

3. It can react with HCO3.

1. Make the purple litmus test solution appear blue, and make the colorless phenolphthalein test solution appear red.

2. It can react with non-metallic oxides to generate corresponding salts and water.

3. It can have a neutralization reaction with acid.

Is cesium hydroxide?

1。It turns purple litmus blue and colorless phenolphthalein red.

2。Reaction with acidic oxides: 2CSoh + CO2 = CS2CO3 + H2O3.

Reaction with acid: CSOH+HCl=CSCl+H2O4Reaction with salt:

2csoh+cuso4=cu(oh)2+cs2so4

It can react with acids and react with acidic salts to form precipitates such as copper sulfate.

It's similar to koh, that is, the activity is stronger, that is to say, the reaction is more violent, and the phenomenon comes out faster Basically!

2Na + 2H2O = 2NaOH + H2 46 36 80x Y8 based on the generation of 8 g of sodium hydroxide.

It can be calculated.

The water participating in the reaction is.

The NA participating in the reaction is.

The mass of the resulting solution after the reaction is.

The mass fraction of sodium hydroxide is 8 80 100% = 10%, you teachers should have miscalculated.

He estimated that he had subtracted the water as well.8

Because the ratio of the relative molecular mass of m(2)o(y) of mo(x) to m()2 is 15:38, the ratio of the number of molecules of mo(x) to m(2)o(y) of m()2 is 38:15 for the same mass.

Note: The water involved in the reaction is one-half of the hydrogen gas produced, so it is calculated using the conservation of mass.

Genju Produce Find the amount of reactants to find the amount of water!

The reaction equation is 2Na + 2H2O = 2NaOH + H2

23x2 18x2 40x2 1x2

Mass 818x2 < 40x2 8 so H2O excess so the water participating in the reaction m = (18x2) x8 (40x2) = mass fraction of solute in sodium hydroxide solution = 8 (

2na+2h2o=2naoh+h2↑

46 36 80 2 g/mol

The mass of 8g atoms is directly proportional to the mass relationship of the reactants, so the water participating in the reaction is the mass of sodium is the total mass inside the vessel after the reaction.

The mass fraction of the solute is 8 80x100% = 10% I don't know how it is calculated, it should be the mass without adding sodium, you teachers should be wrong.

The mass fraction of solute in solution is the ratio of solute mass to solution mass.

Let the mass of the generated water be x, the mass of the input sodium be y, and the mass of the generated H2 be Z2Na + 2H2O= 2NaOH + H2 -46---36---80---2Y---x---8g---zx=

y=z=so the water participating in the reaction is.

The quality of the resulting solution is.

So the mass fraction of sodium hydroxide is 8g 80g 100%=10%.

2Na + 2H2O = 2NaOH + H2 46 36 80A B 836 B=80 8 to get B= G

After the end of the reaction, the water still has g, the mass of the solution is 72+8=80, the mass fraction of the solute in the sodium hydroxide solution is w=(8, 80)*100%=10%.

When wood is used as a telephone pole, it is buried in the ground and the surface of the part is slightly charred Why?

Test Place: Chemical properties of carbon

Special topic: Properties and uses of carbon elemental and carbonaceous compounds

Analysis: The chemical properties of carbon are stable, and it cannot react chemically with other substances under general conditions Answer: Solution:

Carbon is formed after the wood is scorched, and under normal circumstances, carbon is chemically inactive, and it is not easy to chemically react with other substances, and can be used for a long time

Therefore, the answer is: wood burns into carbon, and the chemical properties of carbon are inactive Comments: The key to answering this question is to master the chemical properties of carbon, and only by mastering the chemical properties of carbon can carbon be determined.

It can increase the electrical conductivity of charcoal.

The sample is Fe3O4, A is FeCl3, B is FeCl2, A and B are hydrochloric acid, E is hydrogen, C is carbon monoxide, D is elemental iron, and C is carbon dioxide. Complete...

Solute A: FeCl2, FeCl3, HCl (or FeSO4, Fe2(SO4)3, H2SO4).

Solut E: FeSO4, H2SO4 or FeCl2, HCl

The chemical equation Fe2O3 + 3Co = (high temperature) 2Fe + 3CO2