Listening to students' complaints.
Ren Yan laughed to herself for five minutes before she stopped when she saw the boys' murderous looks.
Then he cleared his throat, still looking at the group of boys with a smile, and said earnestly:
"You can't blame the teacher for this. It's just pressure."
"You also know that if you don't do this, you probably won't be able to learn..."
"Okay! We won't bother with you anymore. Tell us how to use the tools!"
Looking at Ren Yan's face of taking advantage of others, the students in Class 9 felt their blood pressure soar instantly, but in the end they could only grit their teeth and think from a rational point of view.
I forgave my class teacher who specializes in treating anemia.
"Okay, okay, I won't joke with you anymore."
Ren Yan took a deep breath, adjusted his emotions and said:
"In fact, the so-called rust is the oxidation reaction between iron and oxygen in the air. The product is ferric oxide, which is the rust you can see."
As he spoke, Ren Yan picked up a branch and wrote the reaction equation of iron and oxygen on the ground.
"This is, chemistry?" the students asked in confusion.
"Yes, it's chemistry." Ren Yan nodded: "Since rust is produced by chemistry, it can naturally be eliminated by chemical means."
"And removing the rust is your next task."
"But I have to remind you that the rust you see is not just ferric oxide, but a combination of many impurities."
"As for how to remove it, you need to think about it yourself."
"The teacher can only tell you the general method of removing rust in conventional factories."
“There, they often use acids and alkalis to remove light rust as well.”
"I have also prepared some basic chemicals for you. Whether you can successfully remove the rust depends entirely on you."
As he spoke, Ren Yan pulled out a bag from behind him and took out various bottles and jars from it.
He bought these tools in the imperial capital after seeing some rusty ones.
These are all very common medicines, and there are no restrictions on purchasing small quantities.
"Oxalic acid, tartaric acid, citric acid, lake essence, sodium molybdate, phosphoric acid, glycerol..."
Looking at the names on those bottles and jars, the students in Class 9 suddenly felt overwhelmed.
The feeling of taking chemistry class in class is back...
"Don't look at me like that. I'm not forcing you." Ren Yan curled her lips, half-leaned up again, and leaned on a sheep behind her.
Not to mention, it is much more comfortable to lean on a living thing than a dead thing.
When Ren Yan approached the sheep, it just turned its head and bleated, then started eating grass.
It hurts to see the students.
We are racking our brains, and you are enjoying your life?!
Can you be more aware of yourself as a class teacher?
The students sighed again, took the bottles and jars and prepared to go to the girls to study them together.
After all, if they rely on themselves alone, they may never figure out what happened until they die.
Watching the students leave, Ren Yan shouted, "Oh, by the way, it's best not to touch the reagents with your body, it will be more or less harmful!"
“Especially the acid!”
"Also, I have a book about rust removal. You can take a look at it."
As he spoke, Ren Yan waved to the students and threw a booklet over to them.
Looking at the fallen booklet, the students' mouths twitched again.
"How many books did my teacher bring?"
......
After returning to the girls, the boys exaggerated the story about how they had discovered that Teacher Ren was setting a trap for them.
This caused the girls to join in the hatred against the enemy.
And they all expressed.
They must not ask Teacher Ren for help again today!
What if the other party sets a trap for me again? !
Therefore, from now on, the rust removal work can only be done by them independently!
Then, everyone plunged into the ocean of rust removal.
After nearly two hours of brainstorming, the students finally had a general understanding of the rust removal process.
In fact, to put it simply, it is to allow the rust to react, corrode, and volatilize in the acid, and the concentration of the acid also needs to be controlled.
Otherwise, the main body will be corroded easily.
Of course, in order to make the prepared acid more effective, some rust stains that are easy to clean need to be polished clean in advance.
The book uses things like iron brushes and iron pins.
Here, apart from some rusty tools, the only things the students could use were some broken stones and a large plastic bucket filled with drinking water.
Fortunately, after using these things properly, they were able to remove the rust on the surface of the tools.
"Then the next step is to prepare the rust remover."
After all the tools were initially derusted and washed with water to remove most of the impurities, everyone turned their eyes to the chemical reagents that Ren Yan gave them.
The number of reagents was not large, and they studied it for two hours.
They found that these reagents could be used to prepare a maximum of three bottles of rust remover.
Therefore, they do not have many opportunities to trial and error.
"Let's confirm it again before mixing." The squad leader suggested, looking at the reagents in front of him.
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