Chemistry questions for the final exam of the second year of high school, chemistry questions for th

3 Fe + 4 H20(G) == Fe304 + 4 H2 (Don't add ascending sign).

8 mol e-

The number of electrons transferred is calculated:

Think of Fe in Fe304 as 8 3 valence.

0 8 3 The number of electrons lost per mol Fe element is 8 33mol Fe The number of electrons lost is 8 3 *3 = 8mol, of course, it can also be calculated by using H element, 4mol H2 * 2 = 8mol Hope be.

3fe+4h2o(g)=fe3o4+4h2↑

8molFe3O4 has FeO and Fe2O3 in it, so it cannot be calculated. Because it is calculated by the number of electrons obtained from hydrogen.

Rising from zero valence to +8 3 valence, a total of (3 8 3 =) 8mol electrons are transferred.

Chemical equation: 3Fe + 4H2O (steam) = Fe3O4 + 4H2

The transfer electrons are 8mol

3fe+4h2o（g）===fe3o4+4h2↑

It will become difficult to calculate with the electron transfer of Fe There are two valencies of Fe in Fe3O4, which should be calculated with H and 8mol of electrons should be transferred.

I don't think there's a big problem with what you guys think about option D, the reaction of the cathode (without taking into account the hydration of ammonia) should be:

Cathode region reaction.

Therefore, if the hydrogen and oxygen generated in the cathode region can be allowed to enter the anode region, the hydrogen ions in the anode region can indeed be neutralized. Therefore, an anion-exchange membrane is also optional, howeverAt least with a proton exchange membrane wouldn't be a wrong thing to do

Personally, I think that the main reason why proton exchange membranes are used instead of anion exchange membranes is that the hydrogen ions generated in the anode region can be exchanged away as soon as possible through the proton exchange membrane to maintain a higher pH value in the anode region (it will definitely be more effective than using an anion exchange membrane, if you use an anion exchange membrane, you have to wait until the hydroxide has passed through the membrane, and then penetrate a distance to neutralize the hydrogen ions in order to maintain pH), because nitrate has strong oxidation in a low pH environment, which may damage the anodic catalytic device.

There is still some controversy about this topic, but there is also an obvious wrong choice.

Landlord, I need an answer There is an answer Please

I.1Errors, related to quality.

2.True, but the conditions are different, the former occurs under the action of body temperature conditions and enzymes, and the latter needs to be ignited.

Two 13 are both neutralization reactions: containing carboxyl groups, neutralization reactions can occur.

2.Aspirin is an organic substance that can be burned, and combustion is an oxidation reaction.

4.Contains ester groups, which can be hydrolyzed, and the hydrolysis of organic matter is a substitution reaction, so 5 is also right.

Hey, hey, hey, I'm also taking this chemistry paper.

My answer is that one is wrong. The second is correct.

The second question I chose is (because there is COOH, which should be the same as the acid line of acetic acid) 2 also has it. I think organic matter should be burning.

There are 5 (because there is an ester group, it can be hydrolyzed).

I chose 1235

1.Wrong. The heat of reaction is independent of the mass of the reaction, but the energy change of the reaction is related to the amount of matter.

2 are all possible, neutralized with carboxylic acids and oxidized with oxygen carboxylate esterification is a substitution reaction and phenol esters can be hydrolyzed.