"The first question: Put a certain amount of anhydrous alcohol and oxygen in a completely closed container and ignite them. The reaction produces carbon dioxide, water vapor, and an unknown substance X. The mass before and after the reaction is measured. Anhydrous alcohol is 4.6 g and 0 g, oxygen is 8 g and 0 g, carbon dioxide is 0 g and 4.4 g, water is 0 g and 5.4 g, and substance X is 0 g and mg. The value of m is _ _ _ _ _, and the molecular formula of substance X is _ _ _ _ _. "
(Note: In order to facilitate future teaching, Li Zexuan unified the commonly used units at the beginning of the four textbooks. However, this is only the unification in writing. The unification in reality will depend on the joint efforts of Yanhuang College's teachers and students in the future.)
Although Wang Ji was prepared for the difficulty of the exam, the first question was such a practical application and calculation question. This surprised Wang Ji a little. Shouldn't they test the basic concepts first?
However, this question mainly tested the law of conservation of mass in the chemical reaction process. He calculated a little and got the correct answer.
At this time, he couldn't help but feel lucky. Fortunately, he also studied the new mathematics. Otherwise, how could he calculate so fast?
"The second question, on the two plates of the balance, put two glass cups A and B. The glass cups are filled with diluted sulfuric acid of different mass, but both contain 9.8 g of sulfuric acid. It is known that glass A is heavier than glass B. Now, put the same mass of iron and zinc into glass A and B, respectively. After the reaction, the balance will be balanced. Before the reaction, the biggest mass difference between glass A and glass B before the reaction is _ _ _ _ or _ _ _ _.
(Note: Balance has been around since ancient times. It was produced early. In the late Spring and Autumn period, the manufacturing technology of balance and weights was quite sophisticated. Bamboo sheets were used as beams, silk threads were used as buttons, and a copper plate was suspended at both ends. Later, because it was more troublesome to weigh heavy objects, it was changed to "quan". Balance is only used when weighing small objects.)
Although Wang Ji had never seen sulfuric acid and zinc before, he still knew their chemical reactions by heart. However, why does this question seem to be more abnormal than the previous one? It should also use the new mathematics knowledge, right?
Wang Ji's heart began to race. Fortunately, he had done some research on modern mathematics. Otherwise, no matter how familiar he was with the "Chemistry" textbook, he would have to kneel before this test paper!
However, although Wang Ji had done some research on the new mathematics, he was far from being proficient in it. After solving a problem, he was already sweating profusely. It was as if he had run ten miles.
After finishing the second question, Wang Ji couldn't help but raise his head and look at Li Zexuan with a bit of bitterness in his eyes. He thought to himself, "Do I have a grudge against you?" It was just a question. Was there a need to make it so difficult?
He wasn't being pretentious, but strictly speaking, Li Zexuan's question was somewhat "out of line". Moreover, all the questions were biased towards practical applications. It was very difficult to get good grades just by reading books!
"Sigh, no matter how difficult it is, I have to give it my all! I can't lose this bet! "
Although he had only stayed in Yanhuang College for a month, Wang Ji felt that he had completely fallen in love with it. Not only did he like the environment, facilities, and delicious food, but he also liked the atmosphere of Yanhuang College. That positive, united, and progressive atmosphere!
He didn't want to leave!
The desire to live, this was also another kind of desire to live!
The strong desire to live made Wang Ji's mind unprecedentedly clear. His thoughts also became active. Although most of the questions on the test paper were questions he had never seen before, he could always find a way to solve them. Just like that, he broke through all the obstacles. When there was still half an hour before the end of the exam, Wang Ji finally came to the last question.
This was a question-and-answer question. "A mixture of sodium carbonate, sodium bicarbonate, calcium oxide, and sodium hydroxide is 37.2 grams. After dissolving in enough water and fully reacting, the calcium ions, carbonate ions, and bicarbonate ions in the solution are all converted into precipitate. After evaporating the water in the reaction vessel, the final result is 39.0 grams of a white solid. What is the mass of sodium carbonate in the original mixture?"
The aftereffect of surpassing all the obstacles and performing exceedingly well was a headache. At this moment, when he saw the last big question, Wang Ji felt that his head was about to explode! This was because many of the substances in this question could react with each other.
In fact, for a person like Li Zexuan who had received modern higher education, this problem was not difficult at all because it involved nothing more than a multi-step reaction and multi-substance cross-reaction (calcium oxide reacts with water to form calcium hydroxide, calcium hydroxide can react with sodium carbonate, and sodium bicarbonate). As long as multiple chemical reaction formulas were combined into one and balanced to obtain a total chemical reaction formula, the whole problem would be solved without any difficulty.
But for Wang Ji, who was a beginner in "Chemistry", he obviously didn't know this method. What should he do? He had to solve this question!
After thinking for a long time, Wang Ji still couldn't think of a clever and simple way to solve this question. He gritted his teeth, made up his mind, and decided to use the stupidest way to solve this question, which was to use the method of equations.
"Isn't it just that there are a lot of unknowns? No problem, solve it! I don't believe that I can't solve it by today! "
Wang Ji secretly made up his mind.
At the same time, he couldn't help but sigh. Was this a "Chemistry" exam or a "Mathematics" exam? In order to calculate, he used three pieces of draft paper!
Fortunately, he used the pencil that Li Zexuan gave him. If he used a brush, Wang Ji felt that he didn't need to take the exam anymore. Just grinding the ink would be exhausting!
"Clang, clang, clang ~!"
"Okay, time's up. Mr. Wang, please stop writing ~!"
At four in the afternoon, the gongs and drums of the academy sounded. Li Zexuan immediately stood up and said.
At this time, Wang Ji just finished writing the last word. He took a deep breath. He originally thought that three hours was more than enough, but now he didn't even have time to check and had to hand in the paper.
"Haha ~! Wang Wugong, how did you do? "
As soon as Wang Ji handed in the paper, Yan Silu immediately asked.
It was hard to tell whether that tone was filled with schadenfreude or concern.
"I can't, I can't! I'll talk about other things in the future. This old man has a terrible headache now. I have to go back and have a good rest ~! Yamachō, Wen Ji, Kong Gui, this old man will take his leave first ~! "
Wang Ji frowned and scratched his head. He stood up and said with a painful expression. He had used too much of his brain for this exam.
"Mr. Wang, are you feeling unwell? Do you need me to call a doctor for you? "
Li Zexuan asked with a worried expression. He didn't want to ruin a "genius" like Wang Ji because of an exam.
"No need. This old man just feels a little tired. I should be fine after a sleep ~!"
Wang Ji waved his hand.
…
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