The experimental materials are: a glass of water, a glass of salt, a smooth egg and a small spoon. When the materials are ready, the experiment begins. I can't wait to see what will happen.
First, a classmate came to the stage, carefully put the egg in the cup, and only heard a ding-dong. The egg sank like a diver, splashing some tiny water. Then she took a spoon in her left hand and a glass of salt in her right hand, leaning against it and stirring. After a while, the water became turbid and a whirlpool appeared. Eggs sway from side to side, like a drunken old man, like a naughty child, and like a diver. Then the students poured a little salt and stirred hard, and the suspended eggs showed their heads like babies. Finally, he poured a lot of salt and stirred it with all his strength. A magical phenomenon appeared, the egg really danced, and the whole body was suspended on the water. The students cheered and praised.
Later, the teacher told us that the buoyancy of eggs in salt is greater than that in clear water, and we suddenly realized.
It turns out that as long as you observe carefully, you can find scientific truth. I hope to be a scientist when I grow up and explore more scientific mysteries!
Dancing egg 2 composition class begins. The teacher took out an egg, a bag of salt and a glass of water.
At this time, the students began to talk, and the classroom immediately exploded. Some students whispered, "Don't you have a composition class today?" Although some students don't talk, they can see that his head is full of question marks; Some students shouted: "What medicine is in the teacher's gourd?" The students are talking about it. It turns out that this is an experimental class.
The teacher carefully put the eggs into the clear water. Eggs sink into the bottom of the cup like huge raindrops, but there is no sound. Then, the teacher added a small amount of salt with a spoon, only to see the egg dancing like a drunk, staggered down and lying motionless at the bottom of the cup. The students stared at the magic egg tightly, their eyes full of doubts. The teacher added a lot of salt with a spoon and said mysteriously, "Students, it's time to witness the miracle!" " "I saw the egg jump up and down like a little girl playing trampoline, revealing a round head, as if two small fish were playing with a ball. The students are very surprised! The teacher told us: "It turns out that when a lot of salt is added to the water, the density increases and the buoyancy increases, and the eggs float!" " "
This jumping egg is really amazing! It turns out that there are all kinds of mysteries hidden in nature that need us to observe and discover.
Dancing Eggs 3 In today's class, Mr. Huang mysteriously took out three eggs and two bags of salt and said loudly: Students, today we will do a small experiment to see if eggs can float in salt water. Everyone listened to the comments, which was very lively.
Some friends and I got an egg, a glass of water and some salt. We put the eggs in clean water first, only to see them stumbling into the water like a cloth wrapped in stones, swaying like a naughty child. We put some salt into the water, and it became turbid. I dipped my index finger in some water and tasted it. It's too salty. We put some more salt, and the water level rose a little obviously. Seeing that there was a lot of salt at the bottom of the cup, we stirred it with chopsticks for a while. At this time, the eggs turn around like drunk, which is really fun.
I don't understand why so many salted eggs haven't floated yet, so I asked my deskmate curiously, "Why haven't they floated yet?" "Maybe there is too little salt." Afterwards, he poured all the salt into the water. After a while, the eggs floated slowly. The experiment was successful. We danced with joy and showed the experiment to Mr. Huang excitedly.
It's amazing in science that two different kinds of water can make eggs float up and down.
Jumping egg 4 wow! What is this? As soon as I got to the classroom, I saw an egg and a water glass on everyone's desk. Maybe the teacher will boil eggs for us. Just as I was wondering, the teacher smiled and said, "We are going to do an experiment today, an experiment that will make eggs dance!" " "Let the eggs dance. Did I hear you right? I have only heard that chickens can dance, but how can eggs?
I saw a glass with half a glass of water, and the teacher gently put the egg in it. "Bang", the sound of eggs colliding came from my ears. It turned out that other children directly put the cup on the table and threw the eggs into the water. Some eggs are directly sacrificed heroically, and the egg liquid is mixed with water. Look at my eggs again. Like a submarine, it bounces when it hits the bottom of the cup, but soon it sinks slowly.
No response. The egg lay at the bottom of the cup as if asleep. How can we make it dance? The teacher will solve the mystery for us next. She asked us to take out the eggs and pour the salt in. After stirring again, I saw that the clear water was slowly turbid, and I accelerated the speed. "Ok, start putting eggs again, and pay attention to holding up the cup with your hands." Under the teacher's command, we gently put the egg into the cup, and sure enough, the egg floated. Dance leisurely in the water. Suddenly, the cheers in the classroom continued, and a big question mark appeared above our heads. Why?
Finally, it's the teacher's turn to reveal the answer. Everyone pricked up their ears and opened their eyes. The principle of the original experiment is that the buoyancy of salt water is strong enough to hold small eggs, which is the same as the famous tourist attraction-the Dead Sea. When the salt content in the water reaches a certain level, people can lie on the sea and enjoy the sunshine.
It seems unreasonable to make eggs dance, but we all did it!
Dancing Egg 5 In West Asia, there is a sea called the Dead Sea. There are no fish, shrimp and aquatic plants in the sea, and even the seaside is deserted.
It is said that more than 20xx years ago, the Roman commander Imperial Capital invaded Jerusalem, attacked the coast of the Dead Sea and ordered the execution of captured slaves. Who knows, the slaves were thrown into the Dead Sea. Instead of drowning, they were washed ashore. The Imperial Capital believed that God was saving slaves, so he ordered the slaves to be released.
In our composition class, teacher Sunflower explained the magic of all this with a scientific experiment.
I saw the teacher pick up a transparent cup and a slippery egg. The teacher first poured a full glass of water into the cup, and then carefully put the eggs in the cup. The egg staggered into the water like a stone and then stopped.
Then the teacher asked us if there was any way to make the eggs float. We were speechless when asked and had to look at each other.
Then the teacher took out a bag of salt and added a spoonful of sparkling salt to the water. The water is as white as fog in an instant. After a while, the water returned to calm. But the egg still didn't move. We sighed and said that the experiment had failed.
The teacher said with a smile, don't worry. She added a few more spoonfuls of salt and stirred it quickly with chopsticks. The salt soon melted. At this point, the egg circles like a dancer. After a while, the egg slowly surfaced like a submarine, which really surprised us.
It turns out that salt is added to clean water, which increases the density and buoyancy of water, so eggs float with it. This is the mystery of the undead in the Dead Sea. This composition class really opened our eyes!
Before dancing egg 6, the teacher gave us an experiment-floating eggs.
That day, the teacher looked at us with mysterious eyes and took out an egg for us to guess what she was going to do. This egg looks raw at first sight. What does the teacher do with raw eggs? Are you going to break it and eat it? Is it on your head? Or do you want to put it on a spoon and hold an egg-catching competition with the spoon in your mouth? My mind is full of question marks.
The teacher took out a glass of water and salt and began to do the experiment. She gently put the raw egg into the water first, and the egg slowly sank to the bottom of the water, motionless as a wooden head. So, the teacher added three spoonfuls of salt at a time, but the raw egg didn't seem to be disturbed at all, still motionless, like a baby still imagining the world. The teacher stirred for a while, but the baby just moved slightly, but fell down like a drunk.
We froze for a while, we were anxious, and the classroom suddenly became a pot of porridge. Some people are talking and gesturing; Some run around and jump; Others are whispering and pointing.
Add a few more spoonfuls of salt! This time, the teacher put four spoonfuls of salt and stirred it again. A miracle happened: the egg rose like a fairy and then surfaced! Wow! Everyone exclaimed, this picture is really beautiful. Eggs float on the milky water, which looks like a sunset map horizontally, an island vertically and a semicircle obliquely.
The teacher told us that the buoyancy of salt water is greater than that of fresh water, so eggs can float in salt water but not in fresh water. Like the principle of the Dead Sea, the Dead Sea is also because of the high salt content in the water, and people can even float on the water.
I learned a lot of new scientific knowledge from this principle. This is really an interesting experiment!
Dancing egg 7 "Wow ... Wow!" It's amazing! The students screamed. What is Mr. Golden Pen doing? I saw the teacher take out an egg from the red envelope.
The shape of that egg is pointed at both ends and round in the middle. It is wearing a flesh-red coat. Its belly is very big, just like a pregnant woman, and it is also like a beer belly of dad.
After a while, the teacher took out a big box and a cup. The teacher poured the water from the big box into the cup, put the egg in her hand and asked, "If you put the egg in the water, will it sink or float?" Some students talk in succession, some students argue endlessly, some students shout loudly, and some students wonder whether to float or sink.
Then, the teacher carefully threw the eggs into the water. The egg jumped a few times like a naughty doll, just like jumping on a trampoline. At the moment of throwing it into the water, it dived into the water like a diver and fell asleep slowly like a little doll.
The teacher asked again, "How can I make the eggs float?" As soon as the voice fell, the students rushed to answer: "Put salt, put salt." So, like a magician, the teacher made a bag of salt, and then the teacher made a small spoon. The teacher scooped a spoonful of salt with a small spoon, then put it in a cup and stirred it with chopsticks. The water became turbid and the eggs did not move. The students opened their eyes wide and held their breath, even the sound of a needle falling to the ground could be heard.
Later, a "miracle" happened. The egg did some somersaults in the water and then danced a water ballet. To the students' great surprise, the eggs actually floated.
I not only got happiness in this class, but also learned some scientific knowledge.
The dancing egg 8 bell rang. When we entered the classroom, we saw a big glass of water, a bag of salt and an egg on the podium. The students talked about it in succession, and some said, what is the teacher doing? Some people say, is the next class a science class? I'm curious too. What medicine did the teacher buy in the gourd? At this time, the teacher smiled and said, "Today we are going to do an experiment-eggs are floating." Suddenly, the students looked at the teacher in surprise.
The teacher carefully picked up the beaker, filled it with water, and then put the eggs in the glass filled with water. I guess the eggs will sink. Sure enough, the egg wobbled and sank like a small stone. I saw my classmates staring at the beaker tightly, hoping to find something new.
The teacher picked up a spoon, put a little salt in it and stirred it with a glass rod. I saw the egg spinning like a top. I'm a little excited. The teacher filled a little salt with a spoon and continued to stir with a glass rod. I was even more excited when I saw eggs floating in the air like a hot air balloon.
The teacher poured the remaining salt into the water. Soon, the egg floated slowly, like a fairy. This is, I am very excited, the classroom suddenly boiled, some applauded, some screamed.
At the end of the experiment, the teacher explained the secret that eggs can float, and at the same time learned the secret that the dead sea never dies: the buoyancy of salt water is greater than that of clear water.
Dancing Egg 9 Today, my mother and I did a very interesting experiment called "Dancing Egg".
First, we prepare a glass, a fresh egg, a chopstick and some salt. I started the experiment with great expectation. First, we pour in three-quarters of warm water, put the eggs in the water, and then add salt. Once, twice, three times ... I kept stirring, but the eggs seemed to resist me, and no matter how much I stirred, I couldn't make them float.
"Mom, why didn't the eggs come up?" I asked doubtfully. Mother smiled and said, "Because you put too little salt, the eggs won't float." I see! I turned around and poured a lot of salt into the water. At this time, the egg slowly floated up, looking unconvinced. "float up, float up!" I cried in surprise. Finally, I tried to press the egg to the bottom of the cup by hand, but after a while, the egg floated again, just like a dancer dancing!
Suddenly, a new question appeared in my mind. Why do eggs float when they meet salt water? My mother seemed to see through my question and said with a smile, "Because the density of water is smaller than that of eggs, after adding salt, the density of water is larger than that of eggs, so eggs will float!" " "
It turns out that there is so much little knowledge in our life. We should always observe, think and discover more scientific knowledge in real life in the future.
Dancing eggs 10 Have you ever seen eggs that sink on the water? Don't! Let's do this experiment together this time!
First, the teacher took out a transparent cup, an egg, some salt, a spoon, a stick and a glass of water. The experiment began. At this time, the students craned their necks, opened their eyes and looked at the teacher expectantly. The teacher first filled the cup with half a glass of water, and then put an egg in it. The egg quickly sank in, like a sleepy little doll lying in clear water to sleep.
Then, the teacher added three spoonfuls of salt, which dispersed into the water like snow powder. After stirring, the water changed from crystal clear to milky white, and the eggs danced in the water. However, the egg still lay quietly at the bottom of the cup, motionless. The students are puzzled.
Some said, "Can it be successful?"
I saw that the teacher had a well-thought-out plan and added six spoonfuls of salt without hesitation. After stirring evenly, the eggs floated out of the warm bed unconsciously. The students cheered and said, "Wow, it worked. The eggs are floating. " The egg gradually exposed its smooth scalp, like an island.
This experiment was very successful. Eggs sink to the bottom of the water because the density of eggs is greater than that of water. Eggs float on salt water because the density of salt water is higher than eggs.
Jumping eggs 1 1 After lunch, my mother brought me a glass of water, an egg, a chopstick and a small dish of salt, which made me puzzled. What medicine does my mother sell in this gourd? I quickly asked my mother, and my mother mysteriously said, "Do an experiment to open your eyes. The name of the experiment is' dancing egg'. " I snow a smile, "eggs can dance? Mom, you don't even make a draft when you brag now! "
Mother smiled without a word, only to see her carefully put the egg into the water, and soon the egg sank to the bottom of the cup, motionless. I stared at it and thought: Yes, how can an egg dance!
My mother seems to read my mind. She smiled, calmly picked up the egg, unhurriedly added some salt to the water, stirred it with chopsticks a few times, and put it down again. Like a drunk, the egg staggered to the bottom of the cup, as if asleep and motionless.
"What? Mom, are you kidding me again? " I complained discontentedly.
"Don't worry, be patient, the fun is yet to come!" Mother picked up the egg again, poured all the salt on the plate into the water, stirred it evenly, and then put it down. The egg sank to the bottom first, but then it floated again. It goes up and down in the water, like a dancer, dancing ballet for a while and China for a while. I felt incredible, so I reached out and pressed the egg to the bottom. Who knows, as soon as my hand was lifted, it floated to the water and danced slowly.
I was so dumbfounded that my jaw almost fell off. I quickly asked my mother why, and her mother said, "Because the buoyancy of salt water is greater than that of clear water, eggs will float." I didn't expect a small egg and a glass of water to contain such a big mystery! Like my mother said, it's never too old to learn.
Jumping eggs 12 In today's composition class, the teacher took us to do an interesting experiment called "jumping eggs".
The teacher first introduced us to the experimental materials: salt, cups, chopsticks and eggs. The experiment began, and my classmates and I looked at the teacher curiously. The teacher put the egg in the cup, but the egg didn't move. The students said in unison, "How to make the eggs dance?" The teacher said unhurriedly, "Don't worry, I haven't put salt yet!" " "The teacher put the salt in the cup and stirred it with chopsticks. The water became turbid, but the eggs still didn't move. The students were all discouraged, but the teacher smiled and said, "Don't be discouraged. "
The teacher added salt and continued to stir. After a while, the eggs floated slowly. The students can't believe it. They all bent over it. Their eyes are as wide as two bells, and their necks are stretched out like giraffes, as if to get into the teacher's cup. We asked the teacher curiously, how did the egg float? The teacher said, "Because the buoyancy of salt water is greater than that of clear water, you can lift the eggs. The greater the buoyancy, the higher the egg jumps. " After listening to the teacher's words, the students suddenly realized: "So that's it! It's amazing! "
I am very happy today. I learned new knowledge. I will observe more and discover more new things in the future.
Dancing egg 13 I think xu teacher is very strange today. We were asked to bring an egg, a transparent cup and some salt, and we were asked to bring a whole egg.
The next day, my mother helped me make the eggs. I wrapped it in a plastic bag, put it in my cup and put a bag of salt on it. After a while, I went to school and saw that the egg was broken. I thought about it. Maybe when dad was driving just now, he came to a sudden stop. At this time, the egg was broken.
After class, the teacher said, "Let's do the experiment." I was so excited that I couldn't wait to do the experiment. But the teacher added, "You can't experiment with broken eggs." Suddenly I feel so lost, and my heart is as uncomfortable as being caught in the rain. I can't do the experiment because my egg is broken.
After a while, the teacher taught us how to do the experiment. The teacher said, "First, pick up some clean water, then put the eggs in the water, then put the salt in the cup, and stir with chopsticks, so that the salt in the water will melt, and the eggs will float a little. Then add some salt and stir, and the eggs will float on the water."
The teacher asked us to do the experiment. Fu and I did this experiment together and it was very successful. We are so happy!
Xu teacher wrote a line on the blackboard: The density and buoyancy of salt water are greater than that of clear water, so eggs can dance. This is why eggs can dance.
Jump Egg 14 In the first Chinese class, Miss Qiu came into the classroom mysteriously with a plastic bag. The students were very surprised What is this going to do?
Teacher Qiu solved the mystery for everyone-today we are going to do an experiment to make eggs dance in the water.
First, Miss Qiu poured mineral water into a transparent plastic cup, and then carefully put the eggs into the cup. The chubby, round egg baby sank to the bottom of the water and lay there lazily sleeping. Then, Mr. Qiu scooped a spoonful of salt into a plastic cup with a spoon and gently stirred it to let it dissolve slowly. Salt is like a lovely elf. As soon as it fell into the water, it began to play. They played hide-and-seek with everyone and soon disappeared without a trace. Then, Mr Qiu kept adding salt to the water. After the salt was completely dissolved, the baby's egg really changed. I saw it yawning, stretching, wobbling on the ground, standing there with a big belly. Finally, the doll egg actually danced in the water, completed the rotation beautifully like a gymnast, and surfaced the nib like a happy little fish.
What the hell is going on here? Teacher Qiu revealed the answer for us-the density of eggs is slightly higher than that of clear water. When an egg is immersed in clear water, gravity is greater than buoyancy, so it will sink. When an egg is immersed in salt water, the density of the salt water is greater than that of the egg, and the gravity on the egg is less than the buoyancy, so it will naturally surface.
The students cheered. This course is so interesting!
Jumping eggs 15 Today, the composition teacher gave us a strange little experiment-jumping eggs.
The teacher first brought a glass of water, then found an egg and a bottle of salt, and put the egg in the cup. The teacher asked us, "Will the egg float or sink in this glass?" Some students said it would sink, while others said it would float. To prove our point, the teacher put the egg in the cup and it sank. The teacher mysteriously said that eggs would float, and we couldn't believe it.
The magic scene opened, the teacher put the first spoonful of salt, and the egg's ass turned up. I was surprised and said, "This is so interesting!" "
The teacher put a second spoonful of salt, and I watched carefully with my eyes wide open. As soon as the salt was put in, the egg stood completely. I thought: Will it be like the Dead Sea?
The teacher put the third spoonful of salt and the egg floated. I shouted excitedly, "Really, it's floating!" "
The teacher put the fourth spoonful of salt, and the eggs came out completely. The teacher asked mysteriously, "Do you know why?" I replied, "Because, like the Dead Sea, the more salt is put, the greater the buoyancy of the water, so the eggs will float." The teacher smiled and said, "Yes, that's the truth."
I not only had a good time in this class, but also understood a new scientific truth.