Today, the teacher assigned a task-doing scientific experiments. I choose to light a lamp in the water.
I hurried home after school, eager to get all the materials ready. Such as: water, pots, thick candles. Everything is ready now, except for the east wind.
I first took out a stainless steel basin, then took out a candle, inserted it in the basin, and then received some water. The water is a little far from the candle. Finally, I opened the lighter carefully, and my heart was pounding. I hope the experiment will succeed, but God doesn't like it. Just then, the candle fell with a bang. "Ah" failed. But the idea that failure is the mother of success cheered me up again. This time, I learned from the last experience. I was more careful when sticking candles on the bottom of the basin, and I lost a lot of wax. Even the people who gave it to me put it very small, for fear that the water would blow the candle down. ) The exciting moment is coming again. I dare not even go out into the atmosphere. The 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. This makes me dumbfounded. "I succeeded. I did it. Great. " While being happy, problems also follow. "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 a vision of discovery. You will also find many beautiful 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 very confused and thinks: 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 () and I did an experiment in her house. Xin Yi brought a metal spoon, a spoonful of sugar, a lighter, a series of candles and a candlestick. Let's first pick up the metal spoon, pour the sugar, pick up the lighter, put the candle on the candle holder and light the candle. The metal spoon is very hot. Two minutes later, 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 either. 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 (Xin Yi) looked at the bottom of the spoon and said in surprise, "What's the matter? It seems to be stained with ink. What should I do? " "Nothing, I have experience in this field and I can erase it." I pretended to know everything and replied. After that, we immediately wiped off the "ink spots" at the bottom of the spoon, and it was as clean as I said. Yi (Xin Yi) carefully picked it with a toothpick. She said, why is it hard? She touched it with her hand again and said, really, it looks like plastic. I touched it. It's really like 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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Part three: An interesting scientific experiment
Today's science lesson is about the buoyancy of water. When the class was over, the teacher left us a question to think about: What methods can we use to make eggs float on the water? Everyone shouted loudly. Some said, "Add gasoline to the cup." The teacher shook his head. Someone said, "Put the egg in a completely inflated balloon." 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 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 run 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 add salt to the cup bit by bit. However, the egg still did not move. I said to myself, "What is this? Is it not enough for me to add salt? " So, I did another big thing, pouring half a pack of salt into the cup. Thought, anyway, there is salt, enough for mom to cook. And my courage to practice will be affirmed by my mother. Just when I was complacent, a miracle happened! The egg 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 for joy.
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Article 4: Scientific experiments
With the development of science and technology, people can't live without science, which has become an indispensable part of people's lives.
Today, I did an experiment. I lit a candle, stood 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 stuck to the iron bar feebly like a disease and was about to fall off. The magnet fell to the ground with a bang. The experiment succeeded! 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 check 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 in it wanders around, which destroys the consistency of the direction of electron movement and the magnetic effects cancel each other out, so the whole magnet is no longer magnetic.
A small experiment, let us understand so many truths, let us learn what we can't learn in textbooks, broaden our horizons, and let 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 hurried 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 scientific experiments have anything to do with cups? " Then my mother hurriedly said, "Wang Yalong, go to the bathroom and get some toilet paper." The more I think about it, the more curious I am. I quickly took the toilet paper. My mother said with a basin of water, "Wang Yalong, if I put the paper in the cup and put the mouth of the cup in the water, will it get wet?" I casually replied, "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. The water in it 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 smiled and said, "At this time, because there is air in the cup, when I press it, the air is still in the cup. As long as there is air, water can't enter. " Then I tried several times and succeeded. I was ecstatic and shouted, "Great." Because I have learned another scientific knowledge.
Through this interesting scientific experiment, I understand that no matter what I do, I should be good at observation and exploration.
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Article 6: My first scientific experiment-magic liquid
I have done many strange 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 to myself: haha! The first step is so smooth, and 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 merge together, but after a while they separate and become two layers of liquid: the first layer is peanut oil, and the second layer is water; I thought about it: hey! Why don't I pour some soy sauce and see what happens? I poured some soy sauce into the cup and stirred it. Soy sauce and water are mixed together, and peanut oil is still on the first floor. I thought: Why? My favorite honey? What if I pour some honey? Then, I mix honey with these liquids and stir them. At first, it was dissolved together, but it soon became three layers: the first layer was peanut oil, the second layer was liquid mixed with soy sauce and water, 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 together, so they won't blend together?" Dad looked at these liquids carefully, 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 is the relationship between liquid and weight? I'm 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 "magical" liquid made me understand that the immiscibility of the liquid is related to the weight, and also made me understand that only through experiments can the "puzzle" be solved.
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Article 7: Interesting scientific experiments
On Monday afternoon, I read a book called Science in Games at home. After turning a few pages, I saw an article that could make raisins float and make them float up and down. I thought, this experiment is very interesting. Just try it. So, I have to go 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. Then I added a spoonful of baking soda and a few drops of vinegar. Then, a miracle happened! Raisins are floating! But it 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, produce bubbles, and attach to the surface of raisins, making them lighter and floating underwater. No sooner had the bubbles burst than the raisins sank again, collecting enough bubbles, and the raisins floated up again, jumping up and down as if they were dancing happily.
Even a small experiment has so much knowledge, so there are more things waiting for human beings to discover in nature!
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Chapter 8: My Six Experiences in the Experiment
Xiaoshengchu is a battle without smoke, which is an unforgettable experience for students. Many people have entered the ideal school through their own efforts. Of course, it is hard-won. Behind everyone's success, there are countless hardships.
By the end of the review period, I have no weekends. I went to see the Olympic Games 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 sum up my experience from it:
1, study habits are good, which is to lay a good foundation, have a high class efficiency, seize 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. You can sum up in your spare time, find a suitable method and do some synchronous exercises, which will further improve your relevant knowledge.
Don't regard learning as a kind of pressure, but as a kind of fun. When you are tired of studying, 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. Don't ask others whenever you encounter difficulties, but learn to think independently.
Under the intense study, we should adjust our body and mind properly, such as playing ball, swimming and playing chess, which not only exercises our body, but also our thinking, and most importantly, relaxes our mood.
6. Always discover your own shortcomings, learn from the advantages of other students, and constantly improve yourself.
In short, we must "pursue Excellence" and develop our ideals at home!
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Article 9: Scientific experiments
After dinner tonight, I did two experiments, which were very interesting. You really want to hear it, 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 at the bottom of the glass. Next, put the cup in a 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 get out and the water can't get 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, that is, 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 won't sink, and the water will spit bubbles. I think it's strange. If you fill the plastic bag with water and press it, 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, air is lighter than water and will float on the water.
How's it going? Isn't it interesting? Everybody help yourself!
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Article 10: scientific experiments
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 balloons and Kongming lanterns in extracurricular books, I thought this experiment was really fun, so I wanted to do an experiment of Kongming lanterns climbing high by myself.
After I put down my book, I went to look for it. In order to make Kongming Lantern, I need a handkerchief-sized plastic plate, copy paper, paper cutter, scissors, needle-nosed pliers, cotton thread, 502 glue, wires, cotton and bamboo strips. Then I borrowed an alcohol lamp and started making Kongming lanterns. Cut the bamboo strips to a thickness of less than 3 mm with a paper cutter, 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. You can bake it with a small fire and 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. But the copper wire should not be too thin, otherwise it will burn easily. Three copper wires can be screwed together to avoid this problem. Cut the tissue paper into pieces of paper with specifications as shown in the figure. Stick one side of the first piece of paper and one side of the second piece of paper together, and then stick the third and fourth pieces in turn until a ball with a diameter of about 60 cm is formed. Cut another round piece of tissue paper and stick 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 ring with the same size as the hole below, cross two thin iron wires perpendicular to each other in the bamboo ring, tie them on the bamboo ring, and then stick the bamboo ring on the paper edge of the hole below, so that the pasted balloon will not 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 to a copper wire, soak it in alcohol, light it and you can fly it. The plastic bag miraculously floated slowly 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, let go of my hand, and Kongming Lantern rose into the sky. It rose higher and higher, and it was almost invisible. Ah, that's amazing!
The launch was greatly influenced by the venue and weather. When the wind is strong, it is easy to blow the lamp obliquely and burn it. It's easy to get wet when it rains and can't fly. Therefore, it is best to fly Kongming lanterns when there is no wind. The first step is to turn on the lamp body and tie the controls around and at the bottom. Step two, come on. After the third ignition, reduce the air inlet as much 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 surrounding control lines must be straightened. The fourth step is heating until the hot air temperature in the lamp body is enough, and then the surrounding control lines can be slowly loosened to keep the lamp body rising steadily. 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 Kongming lanterns. One person holds the left and right sides of the lamp bottom, and the other person soaks absorbent cotton with alcohol and lights it until both hands feel that the Kongming Lantern is rising, that is, slowly let go of both hands, and the Kongming Lantern will fly slowly, and the rising height can reach about1000 m.
The reason why Kongming Lantern "flies" is because the fuel combustion makes the ambient air temperature rise, and the density drop and rise, thus exhausting the original air in Kongming Lantern, making its own gravity smaller, and the buoyancy of the air lifts it up.
Looking at the Kongming Lantern in the distance, I thought: 1700 years ago, Zhuge Liang made Kongming Lantern by using the principle of rising heat; More than 200 years ago, French scientists made a hot air balloon and carried people into the sky!
Kongming Lantern, also called Sky Lantern, is said to have been invented by Zhu Gekongming during the Three Kingdoms period. At that time, Zhu Gekongming was besieged by Sima Yi in Pingyang, unable to send troops out of the city for help. Kong Ming calculated the wind direction, made a floating paper lantern, tied with the 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. The wishes of men, women and children to write blessings by hand symbolize the bumper harvest and happiness every year.
The structure of Kongming Lantern can be divided into two parts: the main body is mostly bamboo grates, followed by cotton paper or paper paste, and the underframe is bamboo grates. Kongming lanterns can be large or small, round or rectangular. Generally speaking, Kongming lanterns are barrel-shaped made of bamboo pieces, surrounded by thin white paper, and their openings are downward.
When taking off with a light, 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 light the fuel before flying. After the fire in the lamp burns for a while, it will produce hot air and the lanterns will expand. After flying, the whole lantern will soar in Ran Ran. If the weather is clear and the kerosene at the bottom burns out, the Kongming Lantern will automatically descend.
Ah, science is so great, I love science! Like eight honors and eight shames, "I am proud of advocating science and ashamed of ignorance!"
-1500 words
Chapter 1 1 scientific experiment
Once, I played with two stones, and two stones sparked, which I found very strange. I'm going to see "100,000 Why" again, which says: For example, thunder in the sky is caused by the friction of water 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 There was a power outage, and it really worked. At that time, the lighter ran out of oil, and it was dark, so we used a flashlight to get the stone and lit a candle with a fire made of stone. When the candle was lit, we saw it.
-150 words
Article 12: Small-scale scientific experiments
Once, I played with two stones, and two stones sparked, which I found very strange. I'm going to see "100,000 Why" again, which says: For example, thunder in the sky is caused by the friction of water 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 There was a power outage, and it really worked. At that time, the lighter ran out of oil, and it was dark, so we used a flashlight to get the stone and lit a candle with a fire made of stone. When the candle was lit, we saw it.
-150 words
13: Interesting scientific experiment
During your six years of study and life, you must be impressed by many scientific experiments. In my memory, there is a particularly interesting scientific experiment, which is "fire eruption".
"Volcanic eruption", you must have seen it on TV, but have you seen it with your own eyes? I have seen a "volcanic eruption", 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 according to the experimental requirements. Pour some baking soda into the glass first, then some detergent, and then put the newspaper under the glass. The experiment is about to begin. I poured some vinegar into the cup, and a miracle soon appeared. There was only some baking soda and detergent in the bottle just now. They are quiet. How did it turn into a bubble in a few seconds? Moreover, it was just a little bubble, but now it has been soaring. Only after more than ten seconds, it poured out from the glass mouth, overflowed the bottle mouth and flowed 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 bubbles gradually disappeared. Ha, this experiment is so fun, so interesting! Why is this? I quickly grabbed the book and read it. I didn't mention a word in it. Alas! I have no choice but to find a way by myself. Didn't Mr. Liu say in class that baking soda and vinegar will react chemically and produce many bubbles, just like soda water, shaking it will also produce some bubbles. So what role does detergent play? I've racked my brains but I can't figure it out. In order to find out the mystery, I repeated the experiment and found that the reason why the bubble 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 made me understand the scientific truth while playing, and also exercised my ability to use my hands and brains. It is 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.
-750 words
Article 14: Science experiment
The last class in the afternoon is science. Teacher Fan taught us how to use alcohol lamps correctly.
Teacher Fan is holding an alcohol bottle. She asked us to observe and told 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 he would use the lamp holder to put out the lights later. Next, we lit the coal core of the alcohol lamp obliquely from bottom to top with the lit match, and the lamp lit. We observed it for a while. The teacher told us that the flame is divided into three layers, the outermost layer is called outer flame, the middle layer is called middle flame, and the innermost layer is called inner flame. After the observation, Teacher Fan told us that after using the alcohol lamp, we used the lamp holder to cover the flame obliquely from the upper right, and said that Teacher Fan had given us a demonstration. When the lights went out, we found another detail. After the teacher used the alcohol lamp, he did not put it away, but rebuilt it. We asked the teacher why it was built again, but it had already been built. Teacher Fan said it was ok to cover it for the first time, but there was still a lot of burning gas in the bottle cap after covering it. If you don't cover it again and let the gas out, it will be difficult to light it next time, and the students suddenly realize.
Today's science class is really interesting, which helps us understand how to use alcohol lamps correctly. Although we don't need alcohol lamps in life, we can't see such lamps, but it also helps us to understand knowledge and broaden our horizons.
-450 words
Article 15: Interesting scientific experiment
Today, let's go to the road of science and explore the mystery of science!
After dinner tonight, I did two experiments, which were very interesting. You really want to hear it, 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 at the bottom of the glass. Next, put the cup in a 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 get out and the water can't get 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, that is, the water occupies the air space.
The second experiment needs to be prepared: washbasin, tap water and plastic bag. First, fill the net basin with water, fill the plastic bag with air, tie the plastic bag mouth tightly like a balloon, and then press the plastic bag into the water. I found that it won't sink, and the water will still spit bubbles. I think it's strange. If you fill the plastic bag with water and press it, 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, air is lighter than water and will float on the water.
How's it going? Isn't it interesting? Everybody help yourself!