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500 words for the scientific experiment composition in the fifth grade of primary school, thank you! ! ! ! ! ! ! ! Reward score: 0 | Question time: 2010-4-1710: 40 | Questioner: 875923036.
Other answers ***9
Simulated rain
I know that rain is caused by dry weather and upward floating steam.
In today's science class, the teacher asked us to go home and do a small experiment "making rain", and explained in detail how to make rain. Of course, the first thing to do when you get home is to do experiments. First, I took some ice out of the refrigerator, put it in a glass, put a glass cover on the glass mouth, and put the glass on the balcony. But I waited for a long time, but it still didn't rain. I'm really annoyed. I picked up the receiver and called my classmate Huang Qiuyang to ask him if the experiment was successful. His answer was unsuccessful. I called several other students again. Did the experiment succeed? Similarly, they did not succeed. I didn't believe it, so I buried my head and read a science book. As soon as I read this book, I knew why the experiment was unsuccessful. Because the sunshine at night is too weak! Water vapor can't be increased. What shall we do? I thought about it, and soon found a way to increase the steam, and asked my mother to help me heat it on the gas stove. In this way, there is fog in the glass. Many things happen. The fog quickly turned into small water droplets and gathered under the glass cover. Soon, the rain began to tick. I shouted happily, "I succeeded, I succeeded!" " "Mom is also very happy to see it, and praises me for thinking.
After this incident, I was greatly inspired: to do a good job, don't be discouraged when encountering difficulties, study more, think more ways, dare to practice, and will certainly succeed.
I feel heavy because I failed to beat Weng.
Students, have you heard the story of Columbus laying eggs vertically? Columbus broke the egg and stood up. In fact, you can stand up without falling, but it takes about five minutes, which is really too much trouble. Because when the center of gravity is directly above the triangle, the egg can stand upright. When the center of gravity is not above the triangle, the egg falls. The so-called center of gravity refers to the point where the resultant force of gravity acts on all parts of the object. From this we can think of an object, which can not only stand up, but also cannot be pushed down. Needless to say, if you are smart, you will definitely think this is a tumbler. Interesting tumbler, no matter how hard you push, you won't fall down. Even if you put it sideways, it will stand in front of you. Why doesn't the tumbler fall?
Oh! On the one hand, because the top is light and the bottom is heavy, there is a heavy iron block, so the center of gravity is very low; On the other hand, the lower part of the tumbler is made into a smooth sphere. When it leans to one side, its center of gravity rises and it is in an unstable state. Under the action of gravity, it moves to a stable and balanced position. Due to the inertia of the sky, it will swing back and forth several times and finally stay in its original position.
Ah! It turns out that science is everywhere around us. In order to benefit mankind, we must do more scientific experiments, learn more scientific knowledge and study hard.
High air pressure
After reading the composition "An Experimental Class", I doubt that the atmospheric pressure outside the sphere can really press the two hemispheres together.
I redone atmospheric pressure today. Want to know the result? Take your time.
After school, I asked several students to do atmospheric pressure experiments. First, I took out two iron hemispheres, which were the same size and hollow, and a thick rope was tied to the top of each hemisphere. At first, I slowly pumped air out of the air hole and quickly plugged the air hole with a rubber plug. Finally, tie the rope at the top of the iron ball to the leg of the table. When it was ready, all my friends rushed to do it. I think they are so messy, so I'll sort them out one by one and come in order. When I gave the order, the first one pulled hard to the side, and the iron balls seemed to be cast together and could not turn. We all cheered for him, but in the end we didn't succeed. The second man came up. He pulled hard for several minutes, but he didn't pull it down. At this time, I flew into a rage, biting with my teeth, hitting with a pencil box and hitting with a stone, but I didn't break in half for a while. In this way, one by one failed. There were only a few people left, and they were silent, and none of them dared to pull. They thought that such an iron ball had not been pulled down. I think the method in the book may be really useful. I touched the rope timidly, and my friends gave me courage. I pulled off the rubber plug, and then I pulled off the iron ball with little effort.
Afterwards, everyone asked me, "Why can I unplug it?" I said, "This secret must not be revealed."
Why don't soybeans germinate
Last week, I did a novel experiment-incubating bean sprouts.
Grandma gave me some soybean seeds, but I don't think they are enough. I had to take them out of the plastic bag tied tightly by my mother. My mother said the beans in the bag can't hatch bean sprouts. I don't believe it, so I have to do the experiment. So I separated the two kinds of soybeans and hatched them.
According to the introduction in the book and the teacher's guidance, I put these two kinds of soaked soybeans between two layers of wet straw and drench them with water every morning, noon and evening. I think, how can the same bean sprouts not grow in the same way?
The next day, I gently opened the straw on the bean sprouts. The soybean seeds in my grandmother's house have expanded to twice the original size, and many beans have short and thick buds on their waists. But the soybeans planted by my mother only grow fat and don't sprout. What's going on here?
On the fourth day, grandma's bean sprouts grew much taller, but mom's soybeans changed color, from light yellow to dark yellow, and some of them became light black. It seems that I am really going to be "unlucky" by my mother.
On the fifth and sixth day, time passed day by day, and the bean sprouts hatched with grandma's soybeans grew taller and taller, longer and more tender, with jade pillars and golden tops, very beautiful! But mom's soybeans are rotten. Only then did I believe what my mother said was true, but why? I have to ask my mother for advice. My mother smiled and said, "Although the beans are dry, they still need to breathe. Your grandmother's beans are hanging under the eaves, and the air is fresh. Of course, breathing is not a problem. The soybean in that plastic bag is dead because the mouth of the bag is tightly tied, there is no ventilation and it can't breathe. " "Oh, so that's it!" I said thoughtfully.
Unexpectedly, dried soybeans will suffocate. Life is full of science!
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Pinch an egg
After reading my composition topic, my classmates will definitely say, "How can you pinch eggs?" Everyone knows that the thin shell of an egg breaks at the touch. "In fact, this is scientific! Look down if you don't believe me!
That's Wonderful World, which my father took me to Cai Cheng Bookstore. I was busy watching it as soon as I got home. Suddenly I saw an interesting story, which said, "A Hercules can break bricks. But someone told him to break the egg, but Hercules couldn't break it. I looked at it with a grain of salt and decided to find a chance to try.
The opportunity has finally come. One day my father bought a bag of eggs, so I asked my mother for an egg to do a small experiment. After my pleading, my mother finally agreed.
I brought a bowl first, and in order to prevent it from being crushed when I pinched it, those egg yolks spilled all over the floor. Then I put the egg in my hand and caught it. At this point, my heart was pounding and my hands were all sweaty. The scene of broken eggs seems to appear in front of my eyes. In order to find out whether the egg can be crushed, I closed my eyes and squeezed my hand hard, and then waited for the sound of the egg breaking. But to my surprise, when I opened my eyes, the egg didn't break, but I still had some doubts and was ready to do the experiment again.
I put the egg in my hand again (this time I used two hands), and then I gritted my teeth, opened my eyes wide and tried my best to pinch the egg. But despite my efforts, the egg was safe and sound. This really annoyed me and surprised me, so I had to ask my father.
After listening to my words, my father smiled and said, "This is actually a scientific principle. Although the egg is thin, it is oval. When you pinch it, it distributes all your strength evenly in all parts of the egg, so it can bear a lot of strength. Some thin-shell buildings are built using this principle! " After listening to my father's words, I really believed the story in the book.
Ah, what a wonderful world.
I hope there is a suitable answer for you: Zhang Yushuai 19 | Level 3 | 2010-4-1710: 46.
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If you want to find a scientific experiment online, just write it yourself. This kind of composition is unnecessary, just doing an experiment. Respondents: enthusiastic users | 2010-4-1717: 51
I found it.
During a break, several classmates and I got together to discuss "What is earthworm's food?" This topic. The students all said in unison, "The earthworm's food is of course soil!" I feel a little strange: there is no basis for this. Just because earthworms live in the soil, do they blindly talk about eating the soil? In order to get more accurate and well-founded answers, I studied the methods taught by Teacher Zhu and made a small experiment by myself. First of all, I found a box with a cover. There are three kinds of soil in the box: loess, black soil and soil with more decaying substances. Each kind of soil should be as thick as possible, with equal length and width and the same spacing. Then, I dug up ten earthworms from the garden and made them hungry for a while. Then, I casually threw ten earthworms into the box, and then covered it. I waited by the box. After waiting for about 1 or 2 minutes, I couldn't wait to open the lid. But the scene in front of me disappointed me. Ten earthworms were curled up and motionless. I had to cover it and wait by the box. While waiting, I thought that scientists often have to go through countless failures and countless long waits in order to invent something or verify a conclusion. After waiting for such a little time, they are impatient. Thought of here, I can't help but feel ashamed, and my face is burning. I stood up, patted my sore leg with my hand and continued to wait patiently. Ten minutes later, I carefully lifted the lid. The results showed that four earthworms were in black soil, and the other six were in soil with more decaying materials! It turns out that earthworm's food is rotten material in the soil! However, in order to verify the accuracy of this experiment, I did the same experiment again, only this time when I released earthworms, I consciously buried them in the soil with more decaying substances. I waited for about twenty minutes. After opening the box cover, I found that ten earthworms were all crowded in the soil with more decaying substances and lived very comfortably. Seeing this scene, I can't help shouting: "I found the answer!" " I found the answer! "However, to be on the safe side, I rummaged through the books again, and I want to find the correct answer from the books again. Finally, I learned the correct explanation in an animal encyclopedia: "the food of earthworms is rotting plants in the soil." "At this moment, it suddenly occurred to me that in autumn, I found that earthworms have the habit of dragging fallen leaves back to their holes. The reason is the same. Through this experiment, I not only found the earthworm's food, but also understood a truth: you can't blindly listen to others, so your answer is one-sided, even wrong. But through careful judgment, observation and analysis, we can draw a conclusion. This is like comparing the experience and achievements of predecessors or others to a giant, and we are standing on the shoulders of giants to see the world. But that's not enough. If you want to win the crown of the giant's head, you need to work harder to climb up! Interviewee: Yan Zhencheng 1 | Level 3 | 2010-4-19 23: 41.
Simulated rain
I know that rain is caused by dry weather and upward floating steam.
In today's science class, the teacher asked us to go home and do a small experiment "making rain", and explained in detail how to make rain. Of course, the first thing to do when you get home is to do experiments. First, I took some ice out of the refrigerator, put it in a glass, put a glass cover on the glass mouth, and put the glass on the balcony. But I waited for a long time, but it still didn't rain. I'm really annoyed. I picked up the receiver and called my classmate Huang Qiuyang to ask him if the experiment was successful. His answer was unsuccessful. I called several other students again. Did the experiment succeed? Similarly, they did not succeed. I didn't believe it, so I buried my head and read a science book. As soon as I read this book, I knew why the experiment was unsuccessful. Because the sunshine at night is too weak! Water vapor can't be increased. What shall we do? I thought about it, and soon found a way to increase the steam, and asked my mother to help me heat it on the gas stove. In this way, there is fog in the glass. Many things happen. The fog quickly turned into small water droplets and gathered under the glass cover. Soon, the rain began to tick. I shouted happily, "I succeeded, I succeeded!" " "Mom is also very happy to see it, and praises me for thinking.
After this incident, I was greatly inspired: to do a good job, don't be discouraged when encountering difficulties, study more, think more ways, dare to practice, and will certainly succeed.
I feel heavy because I failed to beat Weng.
Students, have you heard the story of Columbus laying eggs vertically? Columbus broke the egg and stood up. In fact, you can stand up without falling, but it takes about five minutes, which is really too much trouble. Because when the center of gravity is directly above the triangle, the egg can stand upright. When the center of gravity is not above the triangle, the egg falls. The so-called center of gravity refers to the point where the resultant force of gravity acts on all parts of the object. From this we can think of an object, which can not only stand up, but also cannot be pushed down. Needless to say, if you are smart, you will definitely think this is a tumbler. Interesting tumbler, no matter how hard you push, you won't fall down. Even if you put it sideways, it will stand in front of you. Why doesn't the tumbler fall?
Oh! On the one hand, because the top is light and the bottom is heavy, there is a heavy iron block, so the center of gravity is very low; On the other hand, the lower part of the tumbler is made into a smooth sphere. When it leans to one side, its center of gravity rises and it is in an unstable state. Under the action of gravity, it moves to a stable and balanced position. Due to the inertia of the sky, it will swing back and forth several times and finally stay in its original position.
Ah! It turns out that science is everywhere around us. In order to benefit mankind, we must do more scientific experiments, learn more scientific knowledge and study hard.
High air pressure
After reading the composition "An Experimental Class", I doubt that the atmospheric pressure outside the sphere can really press the two hemispheres together.
I redone atmospheric pressure today. Want to know the result? Take your time.
After school, I asked several students to do atmospheric pressure experiments. First, I took out two iron hemispheres, which were the same size and hollow, and a thick rope was tied to the top of each hemisphere. At first, I slowly pumped air out of the air hole and quickly plugged the air hole with a rubber plug. Finally, tie the rope at the top of the iron ball to the leg of the table. When it was ready, all my friends rushed to do it. I think they are so messy, so I'll sort them out one by one and come in order. When I gave the order, the first one pulled hard to the side, and the iron balls seemed to be cast together and could not turn. We all cheered for him, but in the end we didn't succeed. The second man came up. He pulled hard for several minutes, but he didn't pull it down. At this time, I flew into a rage, biting with my teeth, hitting with a pencil box and hitting with a stone, but I didn't break in half for a while. In this way, one by one failed. There were only a few people left, and they were silent, and none of them dared to pull. They thought that such an iron ball had not been pulled down. I think the method in the book may be really useful. I touched the rope timidly, and my friends gave me courage. I pulled off the rubber plug, and then I pulled off the iron ball with little effort.
Afterwards, everyone asked me, "Why can I unplug it?" I said, "This secret must not be revealed."
Why don't soybeans germinate
Last week, I did a novel experiment-incubating bean sprouts.
Grandma gave me some soybean seeds, but I don't think they are enough. I had to take them out of the plastic bag tied tightly by my mother. My mother said the beans in the bag can't hatch bean sprouts. I don't believe it, so I have to do the experiment. So I separated the two kinds of soybeans and hatched them.
According to the introduction in the book and the teacher's guidance, I put these two kinds of soaked soybeans between two layers of wet straw and drench them with water every morning, noon and evening. I think, how can the same bean sprouts not grow in the same way?
The next day, I gently opened the straw on the bean sprouts. The soybean seeds in my grandmother's house have expanded to twice the original size, and many beans have short and thick buds on their waists. But the soybeans planted by my mother only grow fat and don't sprout. What's going on here?
On the fourth day, grandma's bean sprouts grew much taller, but mom's soybeans changed color, from light yellow to dark yellow, and some of them became light black. It seems that I am really going to be "unlucky" by my mother.
On the fifth and sixth day, time passed day by day, and the bean sprouts hatched with grandma's soybeans grew taller and taller, longer and more tender, with jade pillars and golden tops, very beautiful! But mom's soybeans are rotten. Only then did I believe what my mother said was true, but why? I have to ask my mother for advice. My mother smiled and said, "Although the beans are dry, they still need to breathe. Your grandmother's beans are hanging under the eaves, and the air is fresh. Of course, breathing is not a problem. The soybean in that plastic bag is dead because the mouth of the bag is tightly tied, there is no ventilation and it can't breathe. " "Oh, so that's it!" I said thoughtfully.
Unexpectedly, dried soybeans will suffocate. Life is full of science!
`
``````
Pinch an egg
After reading my composition topic, my classmates will definitely say, "How can you pinch eggs?" Everyone knows that the thin shell of an egg breaks at the touch. "In fact, this is scientific! Look down if you don't believe me!
That's Wonderful World, which my father took me to Cai Cheng Bookstore. I was busy watching it as soon as I got home. Suddenly I saw an interesting story, which said, "A Hercules can break bricks. But someone told him to break the egg, but Hercules couldn't break it. I looked at it with a grain of salt and decided to find a chance to try.
The opportunity has finally come. One day my father bought a bag of eggs, so I asked my mother for an egg to do a small experiment. After my pleading, my mother finally agreed.
I brought a bowl first, and in order to prevent it from being crushed when I pinched it, those egg yolks spilled all over the floor. Then I put the egg in my hand and caught it. At this point, my heart was pounding and my hands were all sweaty. The scene of broken eggs seems to appear in front of my eyes. In order to find out whether the egg can be crushed, I closed my eyes and squeezed my hand hard, and then waited for the sound of the egg breaking. But to my surprise, when I opened my eyes, the egg didn't break, but I still had some doubts and was ready to do the experiment again.
I put the egg in my hand again (this time I used two hands), and then I gritted my teeth, opened my eyes wide and tried my best to pinch the egg. But despite my efforts, the egg was safe and sound. This really annoyed me and surprised me, so I had to ask my father.
After listening to my words, my father smiled and said, "This is actually a scientific principle. Although the egg is thin, it is oval. When you pinch it, it distributes all your strength evenly in all parts of the egg, so it can bear a lot of strength. Some thin shells stick to each other.
Ah, what a wonderful world. References:
Simulate the next respondent: s377636549 | Level 1 | 20 10-4-20 18:04.
Respondent: 42890655 | Level 2 | 20 10-4-20 18:45.
A small experiment
At the teacher's house, we are doing several small experiments.
First, we prepared materials: two teacups, a piece of paper, a bottle of baking soda and a bottle of vinegar. Then we began to do the first experiment on the table. The teacher poured half a glass of water into the cup, and then put the paper on it. As soon as the button was pressed, the water swished down and wet our books and clothes. We talked about it one by one. The water has fallen, and our mood is also low. But after listening to Liu Bo's speech, we became quiet: "That's because the water is not full. Be sure to fill it up when you do this experiment. " After he finished, we chatted again. "Can he do it?" Is he bragging? "I don't think he can do it well! "Although I don't believe it, I looked at it hopefully, only to see that the water was full, the paper was covered on the glass, and some people took things far away, afraid of spilling them on things. As expected, the water splashed on a button table, but it stayed on the paper for at least three or four seconds before he barely passed.
Next is the acid-base reaction experiment. I saw the teacher pour vinegar into the second teacup and let the "audience" sitting in front.