In the study, work or life, everyone more or less will be exposed to the composition, right, composition is a kind of speech activity, with a high degree of synthesis and creativity. I believe that many friends are very distressed about writing essays, the following is my help to organize the experimental elementary school fourth grade essay, welcome to learn and reference, I hope to help you.
Experimental Primary School Fourth Grade Essay 1"Ding, the class began, I flew to my seat, waiting for the teacher to come to class. At that moment, the teacher came in. She was wearing a dress and a pair of high heels, with a gentle appearance. The teacher first put the file bag in her hand on the podium, and then took out a beaker, a toothpick and a bottle of detergent from her treasure chest. Curious, we poked our little heads out and watched the teacher's every move carefully. I saw the teacher slowly say to the group, "Class, let's do an experiment today, okay?" The students answered in unison, "Yes!" Then an interesting experiment began.
At first, the teacher went to the water dispenser, poured a full cup of water into a beaker, then smeared a little bit of detergent on one end of a toothpick, and then carefully put the toothpick into the beaker. Each of us stared intently at the beaker. The classroom was so quiet we could have heard a pin drop. At that moment, the toothpick was like a ship, floating straight ahead. We were very surprised and started asking the teacher why. With great enthusiasm, the teacher said to the group, "Because the detergent meets the water, the department creates a strong push, and that's why the 'boat' moves forward." As we listened, it was as if we had lifted the dark clouds and met the blue sky. I think that the experiment is really interesting!
Near the end of the class, the teacher said to everyone: "There are still a lot of mysteries in our lives that we need to observe carefully. Let's explore and study these mysteries with wisdom!"
Experimental Elementary School 4th Grade Composition 2Can shampoo dissolve in water? Is dissolving in hot water the same as dissolving in cold water? With these two questions in mind, I started this fun little science experiment at home.
The materials I prepared for the experiment are: two transparent glasses, measuring cups, chopsticks, shampoo.
After the preparation, I couldn't wait to start the experiment. I first put the two cups flat on the table, and then measured 120 ml of cold water and hot water from the cups, poured into the cups, and then a drop of light green shampoo in each cup. I kept my eyes open and watched carefully the change of the shampoo in the water.
Shampoo drops in cold water, first naughty floating on the surface, and then slowly sinking, like a weed growing down. And those in hot water? The shampoo quickly sank to the bottom of the water within seconds, little bubbles appearing like an underwater volcano, it was so beautiful! I stirred gently and the shampoo diffused and dissolved into the water.
The shampoo in the hot water dissolved successfully, but the shampoo in the cold water was still sinking. "What's taking so long?" I said to myself in exasperation. So I stirred it with chopsticks and the shampoo was broken into several small pieces. I kept stirring faster and faster, like a shadowless hand. After sufficient stirring, the shampoo rolled like a cloud in the water, evenly distributed in the water, and finally turned into a light green turbid solution.
Through the experiment, my conclusion is that shampoo can be dissolved in water, and dissolved in hot water faster than in cold water. I solved both problems and my heart was sweet as honey.
What an interesting science experiment! As long as we do more experiments, find problems, solve problems, life is full of scientific knowledge!
Experimental elementary school fourth grade essay 3August 16, 20xx, the world's first quantum satellite launched in Jiuquan Satellite Launch Center. Quantum, an ordinary and extraordinary new term, brought me infinite reverie. So, I watched the British bbc documentary about quantum with my father. There was a small experiment proving the existence of quantum entanglement. I decided to try it myself.
The material for the small trial was two identical coins, provided it was done on a flat surface. For the first time, I spun one coin, spun the second coin at the same time as the first, and then snapped the first with my left hand. At this point, I didn't know which side of the coin was facing up. When the second coin finally stopped naturally, I opened my left hand and realized that the first coin was facing up while the second was facing up. I repeated the attempts 10 times and carefully observed their changes. When both coins touched objects around them, they were forced to stop. Once, both coins were flower facing up, one coin was flower facing up and the other coin was word facing up, and eight other times, the coins stopped naturally, both flower facing up and the other coin was word facing up. I thought: this is no accident. Science is amazing! I was ecstatic that my little experiment worked!
This little experiment just proves the basic principle of quantum: entangled quanta have a certain connection with each other and can influence each other's behavior even if they are far apart. Do you think this scientific phenomenon is amazing? Do it yourself!
Experimental Elementary School 4th Grade Composition 4It was a science class and we did an interesting experiment - how to float a potato.
A few days before the experiment, the teacher asked us to prepare a piece of potato and some salt beforehand, how will it be an interesting experiment?
This science class unveiled our doubts, which turned out to be an experiment on the sinking and floating of potatoes. The materials needed to prepare the experiment are: a glass container, a potato and a bag of salt. After the teacher explained the process of the experiment, we were all eager to try and couldn't help but start the experiment. First, the potato was cut into small cubes and put into a glass container filled with water. Then, carefully add a little salt. But the potatoes are not at all give us face it, still submerged in the water, indifferent, so we went to ask the teacher, the teacher said that this is because the density of salt water is not high enough.
So we put almost half a bag of salt. WATCH! The potatoes floated, but only in the middle of the water. It seems that the water is still not dense enough.
We decided to add more salt, but I accidentally shook my hand and poured the whole bag of salt into the glass container, but because of this carelessness, the potatoes completely floated. "Our group's potatoes floated!" I shouted in delight and amazement.
It turns out that as long as the water is denser than the potatoes, the potatoes can float in the water, which is a really interesting experiment.
One day during winter vacation, my dad and I did a little experiment called "lava lamp".
It's called a "lava lamp" because when it's made, bubbles keep coming out, just like lava erupting. As the name suggests, it's called a "lava lamp".
The materials needed for the lava lamp are water, coloring, cooking oil, and effervescent tablets. Then, my dad and I started to do. I first poured the water and red coloring into the glass in proportion, mixed together. Pour in the cooking oil and add the effervescent tablets. Dad had been watching the process. After watching, he calmly said, "Honey, your proportions seem wrong. Pour too little oil." . Without saying a word I waited for it to bubble, but it didn't seem to have the desired effect. Because there was no foam. Oh, I have to do it again. I sighed y. My dad saw my sad expression and comforted me by saying, "It's okay, let's start over."
"Uh-huh! Let's do it again."
This time I learned my lesson and took a bigger cup, then mixed the water and coloring to 1/3, and finally mixed the cooking oil to 2/3 and put an effervescent tablet in. After a while, the effervescent tablet reacted and bubbled "toot toot" because the water was heavier than the oil, so the oil floated on top. From the top, it looked like lava was about to spew out. After a while, it finally worked.
This time I learned a truth, is not easy to give up, so closer to success.
In this experiment, I not only learned knowledge, but also did the experiment, so happy!
Experimental elementary school fourth grade essay 6Learned the text "fishing iron cattle", learned that Huai Bing use the buoyancy of water to "send" the iron cattle back. But is water really so buoyant? So, with this problem, I let my father and I do experiments.
Dad first let me go to the dormitory cell site to get some sand, and then he brought a bathtub full of water, and then a heavy object as an "iron cow" so that it sinks to the bottom of the water, and then prepared two small wooden bowls, bowls filled with half a bowl of sand, placed in the place of the heavy object sinking. Finally, with an iron bar in two small wooden bowls on a shelf, prepare a rope. The iron rack rolled into the water and the experiment failed. I was not discouraged. I observed that the iron rod was cylindrical and rolled easily. When the wooden bowl shook, it rolled into the water. So I replaced the iron bar with a longer and thicker piece of bamboo, fixed it to two small wooden bowls, then tied one end of the rope to the rack and the other end to a heavy object, and finally slowly scooped up the sand in the bowls with a spoon. As the sand gradually diminished, the two wooden bowls slowly rose, and the weight tied to one end of the string floated up little by little. Finally, the sand was scooped up and the weight floated to the surface. Seeing the success of the experiment, I was so happy that I danced with my hands. The success of the experiment made me feel happy, increased knowledge, but also let me have a deeper understanding of the text.
Experimental Primary School Fourth Grade Composition 7Today I saw an interesting little experiment on the computer.
After watching the experiment, I immediately jumped up to find the materials, which are: eggs, salt, water, and a face basin. I first filled the face basin with water, and then put the egg in it. I tried everything to make the eggs dance on the water. But the result was the same. The egg kept lying underwater and refused to move.
After a while, we came up with the experimental instructions to put a little salt in the water and the egg would float. I took a spoonful of salt and put it in the water. The egg made a little noise, like a baby stretching in the middle. I felt as if the salt was going in again, so I put a little more in and soon the egg was doing a fancy ballet on the water.
Do you want to know why? Because the weight of the egg is heavier than the same volume of water, so the egg will sink in the water. But compared to the same volume of salt water, the egg weighs less, so the egg floats on the salt water.
You can do more experiments in the future, not only to enhance the practical ability, but also to increase our knowledge.
Experimental Primary School fourth grade essay 8Small experiments in life in Sanming City, Fujian Province, Shaxian Experimental Primary School, fourth grade, second class Zheng. You must know water, detergent, cooking oil. Today, my experiment is about their three liquids.
Please pay attention. The experiment has begun.
For the first experiment, I took out a transparent cup, added water to the cup, and then dropped cooking oil into the water. How does the oil float in the water without sinking? Is the water heavier than the cooking oil? I opened my computer with the question and looked it up again and again, and finally found it, oops! The result is that the specific gravity of water is heavier than cooking oil!
The first experiment is over, let's look at the second experiment. I took out a transparent cup, added the same amount of water as the first, and then put the detergent drops into the water. I guess it must float like oil! I didn't expect the detergent not only didn't float up, nor did it sink into the water, but it disappeared into the water. It's a fake. Yes, it's fake. I want to tell my mom. I thought to myself. Thinking about me, I ran to tell my mom.
"Silly boy, it's not a fake. It's because the water dissolved the detergent." Mom laughed.
The third experiment began. In this experiment, the same amount of liquid from the first two cups was poured into a new . Clear cup, the water became clear. Very confused, opened the computer and looked it up. It turns out that detergents can break down oily ingredients and make them compatible with water.
Students, as long as you carefully observe the small things around you, you will gain a lot of knowledge.
Experimental Primary School Fourth Grade Composition 9
Last Wednesday's science experiment by me, in fact, last Monday when the teacher told me, the teacher said I was excited! Back home, I flew through the homework, began to play the piano, and at dinner time, told my mom and dad about this happy event, happy!
After dinner, according to the teacher's request, I began to do PPT.
First of all, this is my first time to do PPT, I do not know how to do, I look at the above let me click on the input, I clicked on it, began to enter the input, lost, I want to make the next page, but I how to point can not enter the next page, at this time, my "savior" dad came, dad gave me a demonstration of the once, I As the method, first click the right button ......, PPT finally finished, I began to prepare to do the experiment materials.
I'm going to talk about the experiment of lifting a bottle with a nut. The nut, the pipe, the bottle and the string are all supplies to be prepared, and once they are ready, it's time to wait for Wednesday.
Wednesday was finally here. In the afternoon, I was nervous, waiting for the class bell, which rang! I started putting on my PowerPoint.
I said, "Today, I'm going to use a nut and lift a bottle." I took a deep breath and started to continue with "Preparing Tools ......", I started to do the experiment, I took the tube and started to do the spinning, and the bottle did rise! I let everyone do the same, all successful, time is fast, do not realize the end of the class, feel very successful, like winning the war.
Back home, I thought, the original do a good job is very difficult to persist to succeed.
Experimental Primary School Fourth Grade Composition 10In the second language class this morning, the language teacher came to the podium, and she also held a raw egg, a chopstick, a cup of water and a bag of salt. When the students saw it, they began to chirp, some of them said, "Is it difficult for the teacher to make us drinks?" Some said, "What on earth is the teacher going to do?" Suddenly, at the teacher's command, the classroom that was just chirping became silent. At that moment, the teacher said mysteriously, "Let's do an experiment to make an egg float." I thought: How can an egg float? What kind of medicine is in the teacher's gourd?
The experiment began, the teacher took the egg into the water, the egg sunk in the water like a doll sleeping, and like a golden dough lying in the water. Language teacher to put a little salt in the cup, stirring vigorously with chopsticks, but after a while, the egg sank, eh? What's going on here? Is not too little salt, then, the teacher put a lot of salt into the cup, the teacher stirred vigorously with chopsticks, the water gradually turned milky white, the egg also slowly floated, like a submarine slowly floating up. The students were very surprised to see this, and they were talking about it. Some of them said: How could the egg float? Some said, "How can an egg float?" Some of them buried their heads in their desks and thought about it. The teacher saw the students so want to know, told us: the specific gravity of water is smaller than the egg, so the egg will sink to the bottom of the water, if you add salt to the water, you can increase the specific gravity of water, so the egg will slowly float up.
I was really surprised and happy, the world is really wonderful.
Experimental Primary School Fourth Grade Composition 11"Success, success." The classroom was noisy. What happened in the end?
It was like this: Mr. Wang gave me an experiment. The lab went like this: teacher Wang took out salt, a small spoon, and pepper. When the students in the classroom saw this, they immediately raised their hands and asked, "Mr. Wang, what are you going to do?" Mr. Wang didn't say anything, but just took out a piece of white paper. Mr. Wang said, "Let's do an experiment on salt and pepper and then separate them." After that a student said, "You can pour pepper and salt into the water." After this student finished, Mr. Wang took out his water cup and poured salt and pepper into the water. Suddenly, the pepper was immediately distributed at the top and the salt at the bottom. After doing this, honestly; "While this is a good idea, doesn't a spoon and white paper work? Does anyone else have an idea?" No one raised their hands, so Ms. Wang had to do it herself. She poured pepper and salt on the white paper and stirred it, took out the spoon and rubbed it on her arm for a while, then rubbed it on the powder a few times and the pepper sucked it up. Last night Mr. Wang said, "This is the science of friction."
This is really an interesting experiment!
experimental elementary school fourth grade essay 12Today, the teacher brought us an egg, a cup of water and a bag of salt that is usually used by mom to fry vegetables. Looking at the teacher placed on the desk of the tools, our class do not know the teacher's gourd sold what medicine? The teacher gave us a hint that today we would see an egg learn to swim, we were very puzzled, the egg did not grow arms and legs, how can it learn to swim? The first time I saw this was when I was a student at the University of California at Berkeley.
The teacher just put the egg into the cup of water, only to see the egg like a drunkard, wobbling and falling down, and soon sank to the bottom of the cup "sleep", a motionless. At this time, the teacher stirred with chopsticks, unexpectedly, the egg shook the lazy body and fell down. At this time, the teacher added a few spoons of salt to the cup of water, and continued to stir with chopsticks, the egg shook, slowly straightened up, suddenly became much lighter, and stood up from the bottom of the cup. Just like a doll that just went to sleep, it bubbled upwards in a daze. Not long after, the egg is like a diver ground oxygen tank without oxygen to come up to breathe, floating to the surface of the water.
Do you know why the egg will float? The teacher revealed to us the principle of the experiment: it turned out that the salt added to the water, the density of the water becomes greater, the buoyancy also followed the greater, so the eggs will float up. Just like why people can float in the Dead Sea above arbitrary, the reason is the same.
A small egg big mystery, we must pay more attention to observation in life, everywhere there is learning, so you can have more discovery.
Experimental Primary School fourth grade essay 13
I remember the first year of high school, one day I walked around the campus and found that there are many pictures hanging in the cultural corridor, and in each picture there is a magic cup. Why do I say that the ordinary cup in the picture is a magic cup? Oh, it turns out that the water in the cup is not just one color, but colorful. It's as if this cup can put a rainbow far away from the ends of the earth into your stomach and make everyone who sees it feel that the rainbow is close at hand. In this winter vacation, I can finally make this magical little cup - rainbow cup!
I invited my best friend to do this experiment with me every day. We found honey, detergent, clear cups, water, and red wine at home, but we couldn't find watercolor! In the end, we had to give away the national paints that we used only once that year. Everything was ready and the experiment was confirmed. We started by slowly putting honey into the cups. But Ms. Honey, who likes to pick and choose, just didn't want to settle down in the cup. Because the honey was so sticky, she crawled into the cup like a snail. Then we slowly put our dear sister in red into the cup. However, in haste, Sister Water, in her blue dress, rushed into the cup before I could reach her. Finally the red wine and oil went into the glass in turn.
Finally, I used some common materials to make a magical and beautiful four-color rainbow in one cup! Looking at their own hand-made rainbow cup, the heart is full of excitement and curiosity ...
Experimental Primary School, fourth-grade essay 14
Walking in from the front door of the school, there is a huge stone towering over the lawn, the stone engraved with a large "true" word, and the outside of the school building hangs the "Sincerity as the basis, the pursuit of knowledge and truth" motto echoed.
To the right of the boulder is a five-story building, red tile walls, rows of transparent windows, clean and bright classrooms, neat desks.
Climbing up the building to get a bird's eye view of the campus, most of the scenery in the bottom of the eye.
Directly in front of the school is the front square, green grass, red flowers, under the sunlight, the grass is more green, flowers more colorful. The brightly colored five-star red flag flutters in the wind over the front square.
The downstairs display window is full of all kinds of works of students, there are exquisite calligraphy, beautiful painting, exquisite models .......
Looking farther west, downstairs is the playground, the red runway in the middle of the basketball court, this end of the runway, there are single and double bars, the other end is the sports building, every festival, students will perform programs in the sports building, rainy days, students will be in the sports building activities.
After visiting Ningbo Experimental Primary School, I love her more.
Experimental Primary School 4th Grade Essay 15I used to love carbonated drinks, and my father disagreed, saying, "Carbonated drinks are not good for our body, and will rot the calcium carbonate in our bones."
I didn't believe it, and my father told me to put an egg in a cup of vinegar and watch it change. I dutifully did so. The eggshell was so hard that it didn't change at all when I put it in. After a while, many small bubbles appeared on the eggshell, gradually became larger, and finally floated up. I fished the eggshell out with a small spoon and found that it was full of small bubbles, some of which were set like jewels in the depths of the eggshell. After a while, I noticed some white spots on the shell, and I suspected that it had shed a layer of its shell. After a while I scratched it with my fingernail and found that I had scratched off a layer of the shell and that the shell had rotted. After a day, the shell of this egg became transparent.
My dad explained to me, "Our bones and eggshells contain a lot of calcium carbonate, and carbonated drinks are like vinegar, which can 'eat' the calcium carbonate in the bones and make them loose." In the end, I think carbonated beverages really shouldn't be drunk!