Chemistry puzzles, who will solve them. Chemical puzzles, who will

The answer to this question is B

1.SO32-, SiO32-, BR-, CO32- all react with Cl2.

2. 2h+ +sio32- ===h2sio33.2H+ +CO32- ===H2O + CO24 Cl2 + 2BR- ====BR2 +2Cl-5 CL- +SO32- ==== SO42- +Cl-Cl2 + 2BR- ====BR2 +2Cl-Cl2 + H2O ====HCl + HCl, so choose B, please understand in time!!

Good luck with your progress!!

1. Correct SO32-, SiO32-, Br-, CO32- will all react with Cl2.

2.Correct 2h+ +siO32- ===h2SiO33Correct 2H+ +CO32- ===H2O + CO24Correct Cl2 + 2br- ====br2 +2Cl-5Correct clo- +SO32- ==== SO42- +Cl-Cl2 + 2BR- ====br2 +2Cl- So choose A

a,Cl2+2br-=br2(orange-yellow)+2cl-; (Redox reaction) Cl2+SO32-+H2O=SO42-+2HCl; (redox reaction) 2H++SiO32-=H2SiO3 (colloidal precipitation); (non-redox reaction) 2H+ +CO32-=H2O+CO2 (gas); (Non-redox reactions) only sodium ions remain the same.

It's na+.

b, A total of three redox reactions occurred.

so32-、、br-、co32-、

Fe and Al will be passivated with concentrated sulfuric acid.

In concentrated nitric acid, an oxidation reaction occurs, and after the reaction, elemental iron and aluminum will exist in an ionic state, because concentrated nitric acid is extremely oxidizing.

However, it cannot be completely said that whether it will be passivated or conditional at room temperature, Fe will be passivated by concentrated nitric acid, and a dense oxide film will be formed on the surface to prevent the reaction from continuing.

When heated, the oxide film is destroyed, and Fe can react with concentrated nitric acid.

If there is an excess of concentrated nitric acid, Fe(No3)3 is generated, and if Fe is excessive, Fe(No3)2 is generated

Fe+6Hno3 (concentrated) = =Fe(NO3)3+3H2O+3NO2 Fe+4Hno3 (concentrated) = =Fe(NO3)2+2H2O+2NO2 It can also be seen from the equation that as the reaction progresses, the acid is gradually diluted, which can also lead to faster and faster reactions.

The first thing that is clear about the reaction with sulfuric acid is the metal element, and the mass is.

Reacting with NaOH are non-metallic elemental elements with a mass of being.

Electrons n(e-) = emitted by metals

Every 1mol released

e- The mass of the metal that needs to be consumed.

It can be inferred that this is magnesium.

mgn(mg)=

Electrons released by non-metals.

n(e-)=

Every 1mol released

e- The mass of the non-metal that needs to be consumed.

It's silicon. si

n(si)=

si+2mg

=mg2si

mg2si+4hcl=sih4↑

2mgcl2

Reacting with sulfuric acid is the elemental mass of the metal is.

Reacting with NaOH are non-metallic elemental elements with a mass of being.

Electrons released by metals.

n(e-)=

So it's silicon. si

n(si)=

si+2mg

=mg2si

mg2si+4hcl=sih4↑

2mgcl2

c correct. The molecular formula of acetic acid and ethyl acetate in a different way does not conform to the concept of isomers.

B benzene does not discolor potassium permanganate.

dEthanol cannot react with sodium hydroxide.

1): A is CH2O, C is CO2, and D is H2O

2): hoch2cho + cu2+ = cu2o (precipitation) + h2o + hoch2coo+

3) A is Hoch2cho, and B is methyl lead bridge-based ethylene oxide ether (structural formula, I can't fight) good and bad; d is h2o

a Rising temperature causes the equilibrium to move in the direction of endothermy, i.e., in the positive direction of h 0, which means that the positive direction of reaction is endothermic.

b Pressurization will cause the equilibrium to move in the direction of decreasing gas volume, that is, the addition of products to C will cause the equilibrium to move in the direction of consuming products, that is, the addition of catalysts in reverse D does not affect the equilibrium movement.

So choose AB

b Correct: The volume of the positive reaction decreases, and the pressure makes the reaction move forward A Correct: The positive reaction is endothermic, and the heating makes the reaction move forward C False: The feeding does not change the equilibrium.

dFalse: The catalyst changes the reaction rate, but does not change the equilibrium.

It is recommended that you take a look at Le Chattle's principle ("Chemical equilibrium" is a dynamic equilibrium, and if one of the factors affecting the equilibrium is changed, the equilibrium moves in a direction that weakens the change to counteract the change. ）

The reaction is endothermic, and increasing the temperature can shift the equilibrium to the right.

This reaction is a reaction in which the number of gas molecules decreases, and it can also be shifted to the right by pressurization.

Select AB

It is possible to make the reaction move forward b, pressurized.

The answer ab, endothermic reaction, the heating equilibrium shifts in a positive direction. The pressure of the 3+1 2 reactants increases, and the equilibrium moves in the positive direction. Increase the concentration of the product, the equilibrium moves in reverse, and the chemical equilibrium of the catalyst is affected.

No effect on chemical reactions.

A, B add C in reverse, the catalyst is uncertain, there are forward and reverse.