Today, the teacher assigned a task-doing scientific experiments. I chose to light a lamp in the water.
I rushed home after school, eager to get all the materials ready. Such as: water, basin, a thick candle. Now everything is ready except the east wind.
I first took out a stainless steel basin, then took out a candle, stuck it in the basin, and then picked up some water. The water surface was a little away from the candle. Finally, I carefully turned on the lighter, and my heart was pounding. I wished the experiment could be successful, but God didn't like it. Just then the candle fell with a bang. "Ah" failed. But the thought that failure is the mother of success made me rally again. This time, I learned from the last experience. I was more careful in bonding candles to the bottom of the basin and dropped a lot of wax. (Even whoever gave it to me put it very small, for fear that the water would blow the candle down. ) The tense and exciting moment has come again. I dare not even go out into the atmosphere. Cold sweat in your hand! I turned on the lighter and slowly approached the candle ... "Wow" miracle really appeared. What a beautiful picture this is. I saw that the flame of the candle actually extended below the water surface. This made me dumbfounded. "I made it. I made it. It's great." Happy at the same time, the question came with it. "Hey? Why is this? " Later, I asked my knowledgeable dad to get the answer.
As long as you have a heart of Ming Rui and an eye for discovery. You must also find many wonderful things in life!
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Chapter 2: The First Scientific Experiment-Burning White Sugar
The science book says that white sugar will burn, which makes us wonder, thinking: How can white sugar burn? As soon as we think about it, curiosity urges us to get to the bottom of it ...
My best friend, Yi Xi (Xin Yi), and I did an experiment at her house. Yi Xi (Xin Yi) brought a metal spoon, a spoonful of sugar, a lighter, a column of candles and a candle holder. We first picked up the metal spoon, poured the sugar, picked up the lighter, put the candle on the candle rack and lit the candle. The metal spoon was extremely hot. After 2 minutes, Yi Xi (Xin Yi) couldn't wait to say, "Why hasn't it melted yet? How slow! Increase firepower! " "Uh-huh ... hurry up, hurry up!" I can't wait, too. After 5 or 6 minutes, the sugar really melted, as if it could not stand the hot flame. At this time, the spoon edge appeared slightly red, and the sugar water boiled. Later, we blew out the candles. Yi Xi (Xin Yi) looked at the bottom of the spoon and said in surprise, "What's the matter? It seems to be smeared with ink. What should I do? " "Nothing, I have experience in this, and I can wipe it off." I pretended to know everything and replied. With that, we immediately wiped off the "ink spot" on the bottom of the spoon, and it was really "spotless" as I said. Yi Xi (Xin Yi) carefully picked it with a toothpick. She said, how did it get hard? Touching it with her hand again, she said, really, it looks like plastic. I touched it, and it was really the same as plastic. She said, "Shit, this spoon is hopeless!"
After I did this experiment, I deeply felt the infinite mystery of science.
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Article 3: An interesting scientific experiment
Today's science class is about the buoyancy of water. At the end of the class, the teacher left us a thinking question: what method can we use to make eggs float on the water? Everyone shouted noisily. Some said, "Add gasoline to the cup." The teacher shook his head. Some said, "Put the eggs in a balloon that is fully inflated." The teacher shook his head again. Others said, "eggs can't float on the cup." The teacher said, "Do you want to know how to do it?" Everyone pricked up their ears. The teacher went on to say, "The solution is very simple. Just add salt to the cup." The students were puzzled, and the teacher explained: "When salt is added to a certain amount, the proportion of salt water is greater than that of eggs, and then eggs can float on the water. Students can go home and try it for themselves. See if it's like the teacher said. " After listening to the teacher, I am still dubious. I decided to go home and try it myself.
When I got home, I couldn't wait to put down my schoolbag and ran to the kitchen. I first found a cup, an egg and a packet of salt. Then add a proper amount of water to the cup, and then carefully put the eggs into the water. Then I added salt to the cup little by little. However, the egg still did not move. I said to myself, "What is this? Haven't I added enough salt? " So, I made another big deal and poured half a pack of salt into the cup. Thought, anyway, there is salt, enough for mom to cook. Besides, my courage to practice will be affirmed by my mother. Just when I was complacent, a miracle happened! The eggs did float a little. I was so excited that I continued to add salt to the cup, and finally the egg floated on the cup. I jumped with joy.
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Article 4: A scientific experiment
With the development of science and technology, people can't live without science, and science has already become indispensable in people's lives.
Today, I did an experiment. I lit a candle, stood it on the table, sucked the magnet with an iron bar, and took it to the fire to burn. At first, the magnet was tightly attached to the iron bar, and the flame of the candle greedily licked the magnet. After a while, the magnet feebly stuck to the iron bar like a disease and was about to fall off. With a bang, the magnet fell to the ground. The experiment was successful! It worked!
Why do magnets lose their magnetism when heated? I couldn't help asking a few question marks in my heart, and I quickly went to the Children's Encyclopedia. It turns out that magnetism and electrons are inseparable, and there is magnetism around the moving electrons. This is called electromagnetic effect. The electromagnet is red-hot, and the molecular heat inside it strays around, destroying the consistency of the direction of electron movement, and the magnetic effect counteracts each other, so the whole magnet is no longer magnetic.
A small experiment made us understand so much truth, made us learn knowledge that we can't learn in textbooks, broadened our horizons, and made us love science, learn science, use science and March towards science from an early age.
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Article 5: An interesting scientific experiment
On Friday, Miss Han, the Chinese teacher in our class, assigned an assignment, which was to write an interesting scientific experiment.
After school in the afternoon, I rushed home and told my mother what had happened. I saw her take out a cup. I was curious and thought, "What is this? How can the scientific experiment be related to the cup?" Then mother said hastily, "Wang Yalong, hurry to the bathroom and take out some toilet paper." The more I thought about it, the more curious I became. I quickly took the toilet paper. My mother took a basin of water and said, "Wang Yalong, if I put the paper in a cup and put the cup mouth into the water, will it get wet?" I replied casually, "Of course it will be wet. Do you need to ask?" Mom said you were wrong, so she put the toilet paper in the bottle and put it in the basin with lightning speed, and the water inside exceeded the cup. When my mother took it out, I found it was not wet. I quickly asked my mother what was going on. My mother said with a smile, "At this time, because there is air in the cup, when I press it, the air is still in the cup. As soon as there is air, the water can't enter." Then I tried several times and succeeded. I was ecstatic and shouted, "Great." Because I learned one more scientific knowledge.
Through this interesting scientific experiment, I learned that no matter what I do, I should be good at observing and exploring.
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Article 6: My first scientific experiment-magical liquid
I have done many fantastic scientific experiments, and what interests me most is the experiment with liquid.
First, I gently turned on the tap and let the water drop by drop into the transparent glass. I thought: Haha! The first step is so smooth, so the next few steps will be even smoother! Then I opened the peanut oil bottle, let the oil pour into the cup obliquely, and then stirred them up with chopsticks. Water and oil merged together, but after a while they separated and became two layers of liquid: the first layer was peanut oil, and the second layer was water; I thought about it: hey! Why don't I pour some more soy sauce and see what happens? I poured some soy sauce into the cup and stirred it. The soy sauce and water melted together, but the peanut oil was still on the first floor. I thought: why is this happening? My favorite honey? What if I pour in some honey? Then, I mixed honey with these liquids and stirred them. At first, they were dissolved together, but soon they became three layers: the first layer was peanut oil, the second layer was a liquid in which soy sauce and water were mixed together, and the third layer was honey.
I think: why do different liquids mix together, and this phenomenon will occur? What a mystery! In order to understand this truth, I took a cup of "strange" liquid to my father and asked, "Dad, look, why don't I mix these liquids and they will not blend together?" Dad looked at these liquids carefully, and then smiled and said to me, "Son, what do you think is the difference in the weight of these liquids?"
I held it in front of me, looked at the liquid carefully, and thought: weight? What does liquid have to do with weight? I am full of questions again? When my father saw me like this, he said, "The lightest liquid is always on the top floor, the heavier liquid is on the middle floor, and the heaviest liquid is on the bottom floor."
Ah! This "magic" liquid made me understand that the immiscibility of liquid is related to weight, and also made me understand that only through experiments can we solve the "puzzle".
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Article 7: Interesting scientific experiments
On Monday afternoon, I read a book called Science in Games at home. I turned over a few pages and saw an article that could make raisins float and make them float up and down. I thought to myself, this experiment is very interesting. Give it a try. So, I got to work.
I found some raisins, a glass of water, a bottle of vinegar and baking soda according to the book. The experiment began. I put a few raisins into the water according to the book, and immediately sank to the bottom. I then added a spoonful of baking soda and a few drops of vinegar. Then, a miracle happened! Raisins are floating! But just floated to the surface and sank again. But I just sank to the bottom and floated up again. It's like dancing up and down. How interesting! The lovely question is: Why can raisins float up and down?
I read the book again with questions. It turns out that vinegar and baking soda can turn into carbon dioxide, producing bubbles, which attach to the surface of raisins, making them lighter and float below the water. Just floating to the surface of the water, the bubbles burst, the raisins sank again, collecting bubbles, enough bubbles, and the raisins floated up again, up and down like dancing happily.
Even a small experiment has so much knowledge, so there are more things in nature waiting for human discovery!
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Chapter 8: My Six Experiences in Entering the Experiment
Xiaoshengchu was a battle without smoke, which was an unforgettable experience for the students. Many people entered the ideal school through their own efforts. Of course, it was hard-won, and behind everyone's success, there were countless hardships.
By the end of the review period, I had no weekend. I went to the Olympics on Saturday and English on Sunday. I was very busy, but because of this, I was admitted to the best school in Xicheng District. So let me summarize the experience I gained from it:
1, study habits are better, which is to lay a good foundation, be efficient in class, grasp every minute to understand what the teacher said, and consolidate it in time after class, so that the learned content can be well digested.
2. In your spare time, you can sum up, find a suitable method and do some synchronous exercises, which will further improve the relevant knowledge.
3. Don't treat learning as a kind of pressure, but as a kind of fun. When you are tired of learning, you can read some interesting math and English stories, so that you can not only relax your spirit, but also get some inspiration about learning from the stories.
4. If you find shortcomings in your study, you should correct them in time, and don't ask others whenever you encounter difficulties, but learn to think independently.
5. Under intense study, you should adjust your body and mind appropriately, such as playing ball, swimming and playing chess, which not only exercises your body, but also exercises your thinking, and most importantly, relaxes your mood.
6. We should always find our own shortcomings, learn from other students' advantages, and constantly improve ourselves.
In short, at home, we must "pursue Excellence" and develop our ideals!
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Article 9: Scientific Experiment
I did two experiments after dinner this evening, which were very interesting. You really want to hear it, right Then listen to me slowly.
For the first experiment, you need to prepare: washbasin, running water, glasses and paper balls. First, take half a basin of water into the washbasin, then tear a little paper and knead it into a ball. Remember, save paper! Put the paper ball in the bottom of the glass. Next, put the cup in the basin filled with water. I found that if you buckle the glass vertically into the basin, the paper in the glass won't get wet at all. Because the air in the cup can't go out and the water can't come in, this is that the air occupies the space of water. If you put the cup into the basin obliquely, the paper will be soaked immediately, because the air goes out and the water has to come in, which is that the water occupies the air space.
The second experiment needs to be prepared: washbasin, tap water and plastic bag. First, fill the basin with water, fill the plastic bag with air, tie the mouth of the plastic bag tightly like a balloon, and then press the plastic bag into the water. I found that it would not sink, and the water would glug and spit bubbles. I felt very strange. If you fill the plastic bag with water and press it down, there will be no bubbles in the water and the plastic bag will sink. This is because when there is no water in the plastic bag, the air is lighter than water and will float on the water.
How's it going? Isn't it interesting? Everybody do it yourself!
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Chapter 10: scientific experiment
When it comes to small scientific experiments, I get excited, because doing small scientific experiments not only makes people feel fun, but also enables them to learn a lot of knowledge.
After I learned about hot air balloon and Kongming Lantern in extracurricular books, I thought this experiment was really fun, so I wanted to do an experiment of Kongming Lantern ascending myself.
After I put down my book, I went to find it. To make Kongming Lantern, I needed a plastic plate the size of a handkerchief, copying paper, paper cutter, scissors, needle-nosed pliers, cotton thread, 502 glue, wires, cotton and bamboo strips. Then I borrowed an alcohol lamp, and I started making Kongming Lantern. Cut the bamboo strips with a paper cutter to a thickness of less than 3 mm, then bend the bamboo strips into a circle and fix them with cotton thread or 502 glue. Bamboo is elastic, and sometimes the bamboo circle may not be round, so you can bake it with a small fire to fix the bamboo circle into a circle. Fine copper wire can be obtained by removing the insulation layer outside the waste wire with needle-nosed pliers. However, the copper wire should not be too thin, otherwise it is easy to burn out. You can use three copper wires to screw together to avoid this problem. Cut the tissue paper into pieces of paper with the specifications shown in the figure. Glue one side of the first piece of paper and one side of the second piece of paper together, and then glue the third piece and the fourth piece in the same order, until a ball with a diameter of about 60 cm is formed. Cut another round thin piece of paper and paste the round hole on it. When it is dry, blow up the balloon, find a thin and narrow bamboo strip, bend it into a bamboo circle with the same size as the hole below, cross two thin iron wires perpendicular to each other in the bamboo circle, and fasten them on the bamboo circle, and then stick the bamboo circle on the paper edge of the hole below, so that the pasted balloon cannot leak. Then tie the copper wire to both ends of the bamboo circle, and then stick the finished lampshade on the bamboo circle. Tie cotton on the copper wire, soak it in alcohol, light it and you can fly it. The plastic bag floated miraculously and slowly up to the roof. I jumped and jumped with joy.
I stood on the table and took down the Kongming Lantern. Then, I came outside the house, released my hand, and the Kongming lantern rose into the sky. It rose higher and higher, so high that it was almost invisible. Ah, it's so enjoyable!
It is greatly influenced by the site and weather when it is launched. When the wind is strong, it is easy to blow the lamp obliquely and burn it. When it rains, it is easy to get wet and cannot fly. Therefore, it is best to fly the Kongming Lantern when there is no wind. The first step is to open the lamp body and tie the control around and at the bottom. The second step is to fill the fuel. After the third ignition, lower the air inlet as low as possible to reduce the loss of hot air, but not too low to avoid the flameout due to insufficient oxygen. At the same time, the control lines around must be straightened. The fourth step is heating until the temperature of hot air in the lamp body is enough, then the control lines around can be slowly loosened to maintain the lamp body to rise steadily, and the control line at the bottom must control the rising speed and height of the lamp body.
You can choose a clear and windless night to fly the Kongming Lantern. One person holds the left and right sides of the bottom of the lamp, and the other person soaks absorbent cotton with alcohol and lights it until both hands feel that the Kongming Lantern is on the rise, that is, let go of both hands slowly, and the Kongming Lantern will fly slowly, and the rising height can reach 1000m or so.
The reason why the Kongming Lantern "flies" is that the fuel combustion makes the ambient air temperature rise and the density decrease and rise, thus discharging the original air in the Kongming Lantern, making its own gravity smaller, and the buoyancy of the air lifts it up.
Looking at the distant Kongming Lantern, I thought: 1700 years ago, Zhuge Liang used the principle of hot air rising to make the Kongming Lantern; More than 200 years ago, French scientists made a hot air balloon and carried people to the sky!
Kongming Lantern, also called Sky Lantern, is said to have been invented by Zhu Gekongming in the Three Kingdoms period. At that time, Zhu Gekongming was besieged by Sima Yi in Pingyang, and could not send troops out of the city for help. Kong Ming calculated the direction of the wind, made a floating paper lantern, tied with a message for help, and then escaped as expected, so later generations called this lantern Kong Ming Lantern. Another way of saying this is that the shape of this lantern is very similar to the hat worn by Zhu Gekongming, hence its name. Modern people put lanterns on Kongming lanterns as a blessing. Men, women and children personally write down their wishes for blessings, symbolizing the success of harvest and happiness every year.
The structure of Kongming Lantern can be divided into two parts: the main body is mostly made of bamboo grates, the second is made of cotton paper or paper paste, and the bottom bracket is made of bamboo grates. Kongming lanterns can be large or small, round or rectangular. Generally, Kongming lanterns are made of bamboo pieces in a barrel shape, surrounded by thin white paper and open downwards.
When you want to light a lamp and take off, tie a piece of coarse cloth or gold paper stained with kerosene or peanut oil in the middle of the bracket at the bottom, and ignite the oil before flying. After the fire in the lamp burns for a while, hot air will be generated, and the Kongming Lantern will expand. After letting go, the whole lantern will soar in Ran Ran. If the weather is fine, the Kongming Lantern will automatically descend after the kerosene at the bottom is burned.
Ah, science is so great, I love science! Like eight honors and eight shames, "be proud of advocating science and be ashamed of ignorance!"
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1 1: scientific experiments
Once, I played with two stones, and the two stones sparked, which I found very strange. I'll go to the "100,000 Why" and it says: For example, thunder in the sky is caused by the friction of water factors in the sky, which is why I still don't believe it. So, I did several experiments and the results were the same. Don't underestimate this move. Once there was a power outage, it really worked. At that time, the lighter ran out of oil and it was very dark, so we used a flashlight to get the stone, lit the candle with the fire made by the stone, and we saw it when the candle was lit.
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Chapter 12: scientific experiments
Once, I played with two stones, and the two stones sparked, which I found very strange. I'll go to the "100,000 Why" and it says: For example, thunder in the sky is caused by the friction of water factors in the sky, which is why I still don't believe it. So, I did several experiments and the results were the same. Don't underestimate this move. Once there was a power outage, it really worked. At that time, the lighter ran out of oil and it was very dark, so we used a flashlight to get the stone, lit the candle with the fire made by the stone, and we saw it when the candle was lit.
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Chapter 13: Interesting scientific experiment
There must be many scientific experiments that impressed you during your six years of study and life. In my memory, there is a particularly interesting scientific experiment, that is, "eruption on fire".
"Volcanic eruption", you must have seen it on TV, but have you seen it with your own eyes? I have seen a "volcanic eruption" once, but this is a simulation experiment of "volcanic eruption", and I have done this experiment myself. Wow, "volcanic eruption" is really fun. I brought a glass, a bottle of vinegar and a bottle of detergent, a pack of baking soda and a newspaper as required by the experiment. First, pour some baking soda into the glass, then some detergent, and then put the newspaper under the glass. The experiment is about to start. I poured some vinegar into the cup, and the miracle soon appeared. Just now, there were only some baking soda and detergent in the bottle. They were quiet. How did it take a few seconds to turn into foam? Moreover, it was just a little bit of foam, but now it keeps rising wildly. Only after more than ten seconds, it swarmed from the glass mouth, overflowing the bottle mouth and flowing into the newspaper. At this time, I was excited and surprised, staring at the floating foam, for fear of missing any details. After about 18 minutes, the foam gradually disappeared again. Ha, this experiment is so fun, so interesting! Why is this? I quickly grabbed the book and looked it up, but I didn't mention a word in it, alas! I have no choice but to figure it out for myself. Didn't Mr. Liu talk about it in class: baking soda and vinegar will react chemically and produce a lot of bubbles, just like soda water, shaking it will also produce some bubbles. So what role does the detergent play? I've racked my brains but I can't figure it out. In order to find out the mystery, I redone the experiment and found that the reason why the foam soared was because the detergent played a catalytic role. This is similar to the formation principle of pumice. This little experiment is really interesting. Doing small scientific experiments has helped me understand the scientific truth while playing, and has also exercised my ability to use my hands and brains. It's really the best of both worlds.
Through this interesting experiment, I not only understand the cause of "volcanic eruption", but also understand that there is science everywhere in life. As long as I continue to experience the process of scientific inquiry, I will certainly gain scientific knowledge and understand the true meaning of science.
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Chapter 14: experiments in science class
The last lesson in the afternoon is science class. Teacher Fan teaches us how to use alcohol lamps correctly.
Teacher Fan is holding an alcohol bottle. She asked us to observe and tell us that the alcohol content in the alcohol lamp should not exceed two-thirds of the bottle. Teacher Fan opened the bottle cap and put it next to the alcohol lamp. Teacher Fan said that the lamp cap would be used to extinguish the lamp later. Next, we lit the coal core of the alcohol lamp obliquely from bottom to top with a lighted match, and the lamp was lit. We observed for a while. The teacher told us that the flame was divided into three layers, the outermost layer was called the outer flame, the middle layer was called the middle flame, and the innermost flame was called the inner flame. After the observation, Teacher Fan told us that after using the alcohol lamp, we used the lamp cap to cover the flame obliquely from the upper right, and said that Teacher Fan gave us a demonstration. When the light went out, we also found a detail. After the teacher used the alcohol lamp, he did not put it away, but built it again. We asked the teacher why he built it again, but it was already out. Teacher Fan said that it could be covered for the first time, but after the cover was covered, there were a lot of burning gases left in the bottle cap. If you don't cover it again and let those gases out, it will be difficult to ignite next time, and the students suddenly realized.
Today's science class is really interesting, which helps us to understand how to use alcohol lamps correctly. Although we don't need alcohol lamps in our lives and we can't see such lamps, it also helps us to understand knowledge and broaden our horizons.
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Chapter 15: Interesting scientific experiment
Today, let's go to the path of science together and explore the mystery of science!
I did two experiments after dinner this evening, which were very interesting. You really want to hear it, right Then listen to me slowly.
For the first experiment, you need to prepare: washbasin, running water, glasses and paper balls. First, take half a basin of water into the washbasin, then tear a little paper and knead it into a ball. Remember, save paper! Put the paper ball in the bottom of the glass. Next, put the cup in the basin filled with water. I found that if you buckle the glass vertically into the basin, the paper in the glass won't get wet at all. Because the air in the cup can't go out and the water can't come in, this is that the air occupies the space of water. If you put the cup into the basin obliquely, the paper will be soaked immediately, because the air goes out and the water has to come in, which is that the water occupies the air space.
The second experiment needs to be prepared: washbasin, tap water and plastic bag. First, the net basin is filled with water, so that the plastic bag is filled with air, and the mouth of the plastic bag is tied tightly like a balloon, and then the plastic bag is pressed into the water. I find that it will not sink, and the water will still spit bubbles. I feel very strange. If you fill the plastic bag with water and press it down, there will be no bubbles in the water and the plastic bag will sink. This is because when there is no water in the plastic bag, the air is lighter than water and will float on the water.
How's it going? Isn't it interesting? Everybody do it yourself!