I always like to read some books about scientific experiments, and I like to experiment by myself.
One day, I had nothing to do, so I took over a book and looked at it with relish & hellip; & hellip; just as I saw the title of 'haunting and changing places', I immediately became interested. What this little experiment says is: put a coin and a piece of cork on the surface of the water and let them stand still. We can change their positions without touching them or blowing air. What about? Listen, isn't that amazing enough?
I can't restrain my curiosity, so I'm going to test it myself. I found a dime, a bowl, water and salt. Because I couldn't find the cork, I found a small plastic bottle cap instead of the cork. As I read the description in the book, I followed the steps in the book: first, I put the coin in the middle of the bottom of the bowl, and then I put water and salt in the bowl. The book suggested that the coin should float to the middle of the water. However, no matter how much salt and water I put in, the coin stayed at the bottom of the bowl and showed no sign of rising. I was so anxious that I turned around the table.
It happened that my mother came to me, asked the reason, and said to me with a smile: 'you can change it into a penny coin and try again. '
'yes! After listening to my mother's advice, I suddenly realized: 'a dime is much lighter than a dime. Why didn't I think of that! '
Sure enough, the coin came to the center of the water.
In the second step, I put the small plastic cap into the bowl, and the cardboard floated to the edge of the bowl.
'next, it's time to witness the miracle.' I excitedly learned Liu Qian's mantra, and found a waste needle, inhaled water, and added water to the bowl & hellip; & hellip;
When the water is higher than the edge of the bowl and has not yet overflowed, the positions of the coin and the small plastic cap are really interchanged!
At this time, a big question mark came into my mind, why can the coin and the small plastic bottle cap swap positions after filling with water? I continued to look at it, and it turned out that there was little water at first, and there was a slight depression in the middle of the water. The lighter cap would float towards the edge of the bowl, while the heavier coin would float at the bottom of the water, that is, in the middle of the water. When we want to add water to the bowl, the tension of the water makes the surface of the bowl bulge upward, and the heavier coins slide to the edge of the bowl, while the lighter bottle cap swims to the top of the bowl -- the middle of the bowl. In this way, they swap places.
These small experiments can make me acquire knowledge and feel happy from them. At the right time, I can also show off to my friends and bring them happiness! An interesting scientific experiment_ 650 words' success, success & hellip; & hellip hw.com.cn ”Push for you; 'cheers of Joy came from my home.
In school, science teachers often do many interesting experiments for us, which aroused my strong interest.
Early on Sunday morning, I got up in a hurry and called up my sleeping sister to do the experiment with me.
My sister yawned and asked lazily: 'what experiment are you going to do? '
I quietly brought a bag of things from a hidden place: a bag of baking soda, a bottle of white vinegar, a glass, a piece of glass, a box of matches and a candle. Just when my sister was still wondering, I had already put a little baking soda in the glass and confidently said to her: 'sister, you'll have to look at it carefully later! '
Although I said so verbally, I still felt a little uneasy, afraid of failure, and let my sister laugh. At this time, slowly lift the white vinegar, into a glass with baking soda. There was a lot of gas in the glass immediately, and I quickly covered it with a piece of glass. My sister was stunned. I thought to myself: hee hee, I'm good!
So I closed all the windows nearby and took a burning match. As soon as I put it into a glass filled with gas, the match went out immediately. Seeing this scene at this time, I added a joy to my heart.
Finally, I poured the gas from the glass on the burning candle, and the candle went out immediately. 'yes, yes! 'My sister and I cried excitedly. My sister, who was always curious about everything, opened her big bright eyes and asked me curiously: 'sister, why do matches and candles go out? '
Yes, why? I consulted the silent teacher encyclopedia. It turns out that the mixture of baking soda and white vinegar will produce a lot of carbon dioxide, which does not support combustion. At the same time, carbon dioxide is heavier than air, and candles and matches need air to burn, so they go out as soon as they touch the gas.
'carbon dioxide! 'I read,' we can use carbon dioxide to make an economical and healthy drink! 'after listening to what I said, my sister couldn't wait to start making & hellip; & hellip;
After this small and interesting experiment, we have learned something that we can't learn from books, and also some common sense in life.
Oh, it turns out that life is full of science. The first test in life_ 600 words dad said, junior high school is the first test in my life.
Before the exam, the review of all subjects was very intense. Chinese and English, as well as science, find out the texts of the previous third grade and review them. They often use the previous junior high school entrance examination papers as homework exercises, often take exams, and often guess the questions that may be taken in the HKCEE. Most of the weekend in the last semester, the teacher asked us to go to school to review. It can be seen how the teacher hopes that we can get good results in the exam!
The day before the exam, my father told me to take all my learning tools with me. "If I'm not afraid of ten thousand, I'm afraid of just in case." in order to prevent my stomachache or drowsiness during the exam, he specially asked me to take some medicine. It was very muggy that night. When I woke up, my father said that he had seen me more than ten times in the night. It is not difficult to see the father's tension and expectation.
On the morning of June 21, it was cloudy and cool. I walked into class 6 (4) of Sanmen foreign language primary school and saw the teacher bring the test paper. I felt uneasy and began to check my learning tools. I was afraid that I would bring something less. I deeply hoped that the questions in the test paper would be simpler.
Although this exam is very important, it is no different from the usual exam in form. It is also divided into comprehensive one and comprehensive two.
In the comprehensive one exam, I feel that reading is more handy than usual, but I spend all my time on writing, which leads to the last question of morality is not as good as writing. Fortunately, I am quite satisfied with writing.
In the second comprehensive examination, I feel that music, computer and science are more at my fingertips. However, when I do it, I still dare not be careless to avoid capsizing in the gutter. What's more, it's still a junior high school? Does anyone feel bad about their future? In mathematics, the last question puzzled me. No matter whether I was thinking about it or scratching my ears, I always couldn't figure it out. It was really 'the mountain is poor and the water is no longer in doubt' ah, time flies by, and the exam ended when I didn't wait for 'another village with dark willows and bright flowers', which left me endless regret!
After the test, I have a fluke at home in case, I hope the teacher who changed the test paper to my one is already sleepy, and I changed the wrong answer as the right one.
How I look forward to entering Sanmen middle school!
Now, I'm waiting at home nervously and expectantly for the results to be released & hellip; & hellip;
This is the first test in my life. There will be countless tests waiting for me in the future. I will 'win without pride, lose without despair' and concentrate on facing every test in my life. The first test in life_ 600 words the first test of my life, my father said, junior high school is the first test of my life. Before the exam, the review of all subjects was very intense. Chinese and English, as well as science, find out the texts of the previous third grade and review them. They often use the previous junior high school entrance examination papers as homework exercises, often take exams, and often guess the questions that may be taken in the HKCEE. Most of the weekend in the last semester, the teacher asked us to go to school to review. It can be seen how the teacher hopes that we can get good results in the exam! The day before the exam, my father told me to take all my learning tools with me. "If I'm not afraid of ten thousand, I'm afraid of just in case." in order to prevent my stomachache or drowsiness during the exam, he specially asked me to take some medicine. It was very muggy that night. When I woke up, my father said that he had seen me more than ten times in the night. It is not difficult to see the father's tension and expectation. On the morning of June 21, it was cloudy and cool. I walked into class 6 (4) of Sanmen foreign language primary school and saw the teacher bring the test paper. I felt uneasy and began to check my learning tools. I was afraid that I would bring something less. I deeply hoped that the questions in the test paper would be simpler. Although this exam is very important, it is no different from the usual exam in form. It is also divided into comprehensive one and comprehensive two. In the comprehensive one exam, I feel that reading is more handy than usual, but I spend all my time on writing, which leads to the last question of morality is not as good as writing. Fortunately, I am quite satisfied with writing. In the second comprehensive examination, I feel that music, computer and science are more at my fingertips. However, when I do it, I still dare not be careless to avoid capsizing in the gutter. What's more, it's still a junior high school? Does anyone feel bad about their future? In mathematics, the last question puzzled me. No matter whether I was thinking about it or scratching my ears, I always couldn't figure it out. It was really 'the mountain is poor and the water is no longer in doubt' ah, time flies by, and the exam ended when I didn't wait for 'another village with dark willows and bright flowers', which left me endless regret! After the test, I have a fluke at home in case, I hope the teacher who changed the test paper to my one is already sleepy, and I changed the wrong answer as the right one. How I look forward to entering Sanmen middle school! Now, I am nervous and expectant to wait for the results to be released at home & middot; & middot; & middot; & middot; & middot; this is the first exam in my life. There will be countless exams waiting for me in the future. I will 'win without pride, lose without despair' and concentrate on facing every exam in my life.
Sixth grade: Mou xuankang, my scientific attempt_ 600 words in life, we can't do without science everywhere, and there is science everywhere. Science is always carrying our dreams and our curiosity. Add wings to our curiosity and fly to the interesting attempts and wonderful discoveries. I remember once, I saw a problem in the book that made me incredible, that is, a thin piece of paper, after moving its muscles and bones, actually lifted a glass that was dozens of times heavier than it. It's really incredible! What's going on? In order to understand why, my friends and I decided to make a scientific attempt. We prepared the materials according to the introduction in the book, a thicker piece of paper and three glasses of the same size, and started to try. We first put two glasses on the table upside down, leaving some proper distance between them. Then we put a piece of paper folded like an organ on the two glasses, and then put a third one in the paper