A controversial issue! A controversial issue

To put it bluntly, water absorption is a physical process, and dehydration is a chemical process!

Water absorption is manifested in the absorption of free water in the substance, and dehydration is manifested in the removal of the two elements in the substance that are not originally independent h:o=2:1 in the form of water, that is to say, the chemical reaction that occurs in the dehydration process produces water, and it is precisely because of the strong water absorption of concentrated sulfuric acid that this reaction occurs.

There may also be free water in the aqueous copper sulfate, but when it comes to hydrated copper sulfate, it is considered pure by default, after all, it is a high school examination education, and it is not considered so much. So what your teacher said is wrong.

But strictly speaking, since the hydrate is often mixed with a small amount of free water, then the water absorption process also exists. According to the requirements of the exam, you should say that it is dehydrated.

Our teacher talked about this in detail.

Water absorption: refers to the absorption of free water.

Dehydration: refers to the separation of H, O from the compound according to the standard of water, that is, 2:1 Strictly speaking: concentrated sulfuric acid absorbs the crystalline water in copper sulfate pentahydrate is dehydrated.

Simplifying this in high school is said to be absorbent.

And the problem in the reference book, the teacher said that the new textbook had just been changed to dehydration.

And the reference book has not been changed, the college entrance examination is filled with water absorption, and the teacher also said that this kind of thing will not be tested.

If it is to absorb crystal water.

It's dehydration.

Because crystal water is different from free water.

It's not real water anymore.

Rather, it is part of the copper sulfate crystal pentahydrate.

It's just that the ratio of hydrogen to oxygen is written as water because it is in the form of water.

Therefore, its dehydration is a chemical process, a change in substance.

Hence dehydration.

If it simply absorbs free water, it is water absorption.

Water absorption: refers to the absorption of free water.

Dehydration: refers to the separation of H,O from the compound according to the standard of water, i.e., 2:1.

Strictly speaking: concentrated sulfuric acid absorbs the water in copper sulfate pentahydrate is dehydrated.

I don't know the standard of the college entrance examination, but what is right is right.

Won't let you write something controversial.

The difference between water absorption and dehydration is that water absorption is water that absorbs water molecules and is in a free state. Dehydration is the removal of hydroxide in the form of water according to the composition of water from the molecule. (Think of the experiment of adding sulfuric acid to white sugar).

So, what your teacher said is not correct.

Water absorption is a physical process, and dehydration is a chemical process!

Category: Annoyance.

Problem description:1Two rails: one clearly marked as operational (track A) and one clearly marked abandoned (track B).

2.There are 3 children playing on the railroad track being used (track A) (they know that the train can be touched and can run on it), and there is 1 child playing on the abandoned track (track B) (he knows that there will be no trains on the abandoned track).

3.A train is coming from track A in the distance, and you are the driver of this train. You see 3 children playing on track A in front of you. It's too late to brake.

4.You can now make the following two options:

a) Continue to drive on track A, the consequence is that the 3 children will be hit and killed.

b) Go to track B, the consequence is to kill 1 child playing on track B.

5.Whatever choice you make, it won't have any impact on you or anyone else on the train (legal or physical, etc.).

Analysis: Stephen Chow: Why do you force me to kill? (The King of Comedy).

Whatever I had to choose, I would have chosen not to laugh at it, even if I had to die, even if it wouldn't have any effect (legal or physical, etc.) on me or anyone on the train? The judgment of conscience has sentenced me to indefinite regret and guilt. Because I've seen the tragic picture of a white-haired man sending a black-haired man (first, it has nothing to do with me).

A 12-year-old child in our village was knocked unconscious by a broken car and taken to the hospital, where he said he could not be resuscitated and had to be sent to a hospital in Beijing. However, during the escort, the ambulance collided with a large truck, and the 12-year-old boy passed away (if I lied to people, I would have hemorrhoids and be struck by lightning). When it was sent, the crying sound of their family was no longer a human sound, and after listening to it, everything felt trembling.

It's miserable. Now I say that I don't choose anything, maybe I will subconsciously choose B when I actually say it), at least there are fewer deaths. But the condemnation of conscience is inevitable, and it is the same to choose whichever one.