1, experimental sixth grade composition, there is a science class during the day, I am very interested. In the evening, when I got home, I did an experiment called "underwater volcano".
The materials needed for the experiment are: a small bottle, a big glass jar filled with cold water, a string and a few drops of red ink.
The experimental method is very simple. The first step is to wrap a string around the neck of a small bottle.
However, what should I do if the vial is unbalanced at this time? You can wrap another rope around the bottleneck. This way, the eldest son can keep balance with the ropes on both sides of the bottle mouth. Step 2: Fill the vial with hot water. After filling, drop a few drops of prepared red ink into the vial. Step 3, slowly put the vial into a large glass jar filled with cold water and put it at the bottom of the jar. At this point, the steps of the whole experiment are completed.
Next, let's see what's new. In less than five minutes, I was surprised to find that the red water in the small bottle gave off a red "flame" like a volcano, forming a wonderful "volcano in water" phenomenon.
Through the experiment, I understand a scientific truth, that is, the law of "heat is light and cold is heavy", that is, the density of hot water is small and the density of cold water is large. After this experiment, I also love science more.
I am at home alone today, doing nothing. Suddenly, I had a new idea: Why don't I help scientists find more answers? Do it. I heard from the teacher that there is atmospheric pressure in the world. I want to know what atmospheric pressure is, so I did an atmospheric pressure experiment.
I have prepared a paper cup, a water cup, some paper and a plastic basin. The experiment began. I fill the plastic basin with water first, then connect the paper cup with a glass of water and pour it into the paper cup. I listened attentively, and my voice tinkled like a spring, which was particularly nice. Next, I put a piece of paper on the mouth of the cup, and then turned the cup upside down. I have a piece of paper in my hand, and it's time to witness the miracle: I didn't spill a drop of water, I held a cup in my hand, and the water still didn't spill.
Is this atmospheric pressure? I think it's better to check online. It says on the Internet: This is the pressure of the atmosphere. Water is not spilled because there is no air when the cup is full of water, but there is air outside the cup. The air outside the cup is called atmospheric pressure. Atmospheric pressure will hold the paper, so the water will not overflow.
Although someone has done this experiment for a long time, I am still very happy, because this experiment accompanied me to spend a happy weekend!
On Sunday morning, I had nothing to do after dinner and felt bored. Suddenly, my father excitedly said to me, "I will make matches dance." I was surprised and asked with a grain of salt, "Really? Then teach me." Dad said, "No, I won't teach you. Check the information yourself. " I said, "well, if you don't teach, you won't teach." You must be unable to dance with matches. That's why you asked me to check the information. " However, this is also an interesting thing! So, I turned to the encyclopedia. The book says to prepare a basin of water, a box of matches and a bucket of glue. I'm really excited to start doing experiments!
I put glue on the match first, and then put the match in clear water. After a while, the miracle really appeared, really unexpected! Matches actually danced. After a while, the match stopped beating. After a while, the match began to dance again. My mind is full of question marks. So I asked curiously, "Mom, what the hell is going on?" Mother said, "Go and find the answer yourself."
Once again, I began to look through the information to find the answer. It turned out that the match was coated with glue, and the gas gathered together, so the match naturally floated on the water and danced. The match stopped beating because the gas dispersed. Oh, I see. I finally know the secret why matches dance!
Hehe, today is really a bumper harvest, and my scientific knowledge has risen to a higher level!
Today, my father took me to do an egg salt water test on my academic assessment-eggs will float on the water.
I first found a teacup and put it in the water. Father said, "Put the egg in and see if it is heavy or floating." As we all know, eggs are bound to sink, and I replied without thinking: "sink." Dad said, "Now let's experiment with salt bit by bit to see how many salted eggs will float." So, I first put a spoonful of salt, stirred it with chopsticks at a constant speed, and added eggs, which were very heavy. Two scoops, three scoops, four scoops, five scoops, my temper is a little unbearable, shouting: "Dad, eggs can't float, this experiment can't be carried out." Dad smiled and said, "Don't worry, when the salt water reaches a certain concentration, the eggs will float." "You don't know people won't sink into the Dead Sea? The same is true of salted eggs. Mom said it was hot.
I took the trouble to add salt for the sixth time. I put the eggs in carefully, but they haven't floated yet. The seventh spoon, the eighth spoon, the ninth spoon and the tenth spoon, the big head of the egg floated up. I jumped three feet happily: "Yes, it worked!" " "Dad put the salt water into the mineral water bottle and said," This salt water weighs about a catty.
In this experiment, I not only know that eggs can float in salt water, but also know that people should be patient.
The composition of the fifth and sixth grades in the experiment "turned brown!" "It's brown!" There were shouts of excitement in the classroom. What the hell is going on here? So we are doing an interesting experiment.
Under the guidance of Teacher Cao, I prepared a candle, a match, a small spoon and a small amount of sugar. After the preparation is finished, I will put a spoonful of sugar on the fire and bake it. About 5 minutes, white sugar smokes; After another 3 minutes or so, the sugar bubbled. I looked at the sugar in the spoon and cried, "Come and see, why is this bubble brown instead of white?" Hearing this, the teacher smiled and said, "You observed it very carefully!" Hearing the teacher's praise, I was elated and continued to observe carefully. Where my opinion turned brown, it was only as big as a grain of rice at first, gradually became as big as a soybean, then as big as a fingernail, and finally turned into a brown solid.
Why does sugar turn brown? We were confused and asked the teacher for advice. Teacher Cao said with a smile: "White sugar is a kind of carbohydrate, which is made by mixing water and carbon in a certain proportion. When sugar is heated to a certain extent, the combination of water and carbon is destroyed, and water is separated from sugar to produce a new substance-brown carbon solid. " Oh, I see! The teacher smiled knowingly when she saw everyone's suddenly enlightened expression.
How interesting this experiment is. It not only makes us understand the scientific truth, but also makes us happy.
At ten o'clock on Saturday morning, the sun is shining. Xiaogang and I were doing optical experiments on the lawn in front of the yard with a magnifying glass and a piece of paper that was not too thick.
We first put a piece of paper flat on the ground, and then put a magnifying glass at the sun and paper; A dazzling aperture immediately reflected on the paper. As the lens moves, the aperture gradually narrows and finally becomes a light spot, which is very dazzling. I can't take my eyes off that bright spot. Suddenly, a miracle appeared and I jumped for joy. "Come and see! The paper is smoking. " The words sound just fell and the paper has been burned into a big hole. Xiaogang asked me curiously, "Why does paper burn by itself?" I can't answer at the moment.
When I got home, I checked the computer. It turns out that the sun is a fireball, and the heat energy of the fireball shines in the magnifying glass. Magnifier shines heat energy on paper, which has a small light spot and slowly burns into a big hole. I went back to the lawn and told Xiaogang this truth.
Through this experiment, I must concentrate on understanding what I don't understand. Only in this way can we know a lot of knowledge and make contributions to the country and society in the future.
Yesterday, the teacher asked a strange question in class: a cup is full of water, then cover it with paper and put your hand down so that the water won't pour out. Is this possible? We all say, "impossible" The teacher said, "You can do it after class or at home." . So I went home and couldn't wait to do it. First, I took a small cup and filled it with water. I also took a piece of white paper, covered it on the cup, and carefully turned it upside down. Not only did the paper not fall off, but also the water was not spilled. What's going on here?
Why didn't the paper fall off? Why didn't the water overflow? I think it's strange. In today's morning reading class, I was as confused as a monk in Zhang Er. I asked the teacher eagerly. The teacher patiently replied: "Because a glass of water is full of paper, there is no air in it, and it is in a negative pressure state. Turn it over slowly, and the paper and water will not fall, because there is negative pressure in the cup, and the atmospheric pressure in the air' holds' the paper and water so that they will not fall. " Oh, I'm beginning to understand the principle of this experiment. This experiment is really interesting, which not only cultivates our hands-on ability, but also lets us know some scientific knowledge.
I did two experiments after dinner today.
In the first experiment, you need to prepare a washbasin, a tap water cup and paper balls. First connect the washbasin with half a bottle of water, then tear some paper and knead it into a ball, and put the paper ball into the bottom of the cup. Next, put the cup vertically into the water. The paper in the cup won't get wet at all. It turns out that if the cup is put vertically into the water, the paper will not get wet at all, because the air in the cup can't get out and the water can't get in, which means the air occupies the space of the water. But if you put the cup into the water obliquely, the paper ball will be soaked immediately, because the air goes out and the water must come in slowly, which is that the water occupies the air space.
The second experiment needs to prepare a washbasin, tap water and plastic bags. First, fill the basin with water, fill the plastic bag with air, tighten your mouth like a balloon, and then press it into the basin. I found it wouldn't sink, and the water was bubbling. I think it's strange. If you fill the bag with water and press it, there will be no bubbles in the water and the bag will sink. This is because air without water is lighter than water and will float on the water. Italian scientist Galileo said: "All reasoning must come from observation and experiment." Science is meaningful only if it is done by itself; Only by doing it will the experiment succeed.
I like doing experiments, science, and love science!
When we had science class last week, the teacher asked us to bring a few things when we came to class again this week: candles, some corn kernels and an iron spoon. This group should prepare at least one copy.
We are all curious about why we should bring a few things. Everyone was very excited before this class. After the bell rang, the teacher smiled and walked into the classroom, stepped onto the platform and said to us, "Today the teacher will take you to do an interesting experiment."
The teacher showed us on the platform first. She lit a candle first, then put some corn kernels in a small iron spoon, and then put her hands on it and waited. We all held our breath and watched what would happen to these little corn kernels. After about seven or eight minutes, a classmate suddenly let out a cry: "The corn kernels are cracked." We all gathered around to watch. Sure enough, several corn kernels cracked one after another, just like the usual effect of frying popcorn. That's really interesting.
After that, we divided into groups and did experiments by ourselves. During the experiment, everyone was very excited. After the experiment, someone picked up the "experiment" and tasted it. Although it is not very delicious, it still has some sweetness. This is really an interesting experiment.
Today, our teacher was carrying a schoolbag, which attracted students' curious eyes. "Ding Ling Ling", when the class began, the teacher said to us, "Today we did an interesting experiment called' Why doesn't the cardboard fall'." After that, I heard cheers in the classroom.
The teacher took out some cups, a bottle of water and some cardboard from the bag. It turns out that the bag is filled with experimental materials.
The teacher chose two people to do the experiment and gave them a demonstration. The experiment began. I saw 1 players pouring water in a hurry. I didn't know if it was full, so I put a piece of paper on the cup, turned it upside down and suddenly let it go. Wow! The water came out and caused the students to laugh.
Look at contestant number two again. Take your time. After filling the glass with water, put the cardboard on the top of the glass. Then press the cardboard, and don't let the cardboard have gaps; Then turn the cup upside down; Finally, the hand pressed on the cardboard was gently released, and the cardboard was firmly "sucked" into the cup mouth. It's amazing!
Then the teacher said, "Do you want to know why the cardboard won't fall off?" "think!" We answer together. "Because of the high air pressure outside, the cardboard won't fall off," the teacher explained.
This is really a strange and interesting phenomenon. I was very happy and thought: this experiment is really interesting! I will do more scientific experiments in the future, because there are still many unsolved mysteries waiting for me to discover!
Instructors: Liu Zhen, Chen Liwei.
Experimental sixth grade composition 1 1 When I was in the third grade, I personally experienced an interesting experiment. One day, in science class. I saw Miss Yan holding an egg, a bag of salt and a glass of water. We all don't know what medicine the teacher is selling in the gourd. So, the teacher said, "Students, today we are going to do an interesting experiment.
That is, put the eggs in water and add salt constantly to see what happens to the eggs. Who will try? "The whole class's hand" wow "once raised. The teacher called my name. I went to the blackboard and put the eggs in the water. The egg sank to the bottom of the cup. Then I grabbed a handful of salt and put it in the water. Eggs float up and down in the cup, just like dancing.
I grabbed a handful of salt and put it in the water, only to see the egg float up slowly, just like a little girl showing her face. The teacher explained, "Why do eggs sink and float?" ? The mystery is that the ratio of water to eggs is different. At first, the proportion of eggs is larger than that of clear water, so eggs will sink. Later, salt was constantly added to the water, and the proportion of water gradually increased until it was greater than the proportion of eggs, and the eggs floated up. "This little experiment is very simple, but it contains profound scientific truth.
Submarines are really amazing. It can float up and down freely in the sea. I want to do an experiment. I took out an empty drink bottle with a lid, an eye drop bottle, a glass and a nut.
First, I put half the water in the eye drops bottle and put the nuts on the bottle mouth. Put some water in the glass and turn the eye drops bottle upside down. Next, fill the empty beverage bottle with half water, put the eye drops bottle upside down in the water of the beverage bottle, and tighten the lid of the beverage bottle.
Twist the beverage bottle by hand, only to see the water in the eye drop bottle slowly increase and then sink into the water. When you let go, the water in the eye drops bottle decreases first and then floats again.
I checked the information and understood the reason. It turns out that the buoyancy generated by the eye drop bottle can make it float in the water. When the beverage bottle is squeezed, the water in the bottle is pressed into the eye drop bottle by air, and the bottle becomes heavy and sinks. When the hand was released, the water flowed out of the bottle, and the bottle became lighter and floated again.
So this is the principle of submarine. This experiment enriched my knowledge.
There was a science class last week, and the teacher asked us to take first-class products such as plasticine, wood blocks, table tennis, balls, glass bottles, foam, iron sheets and pebbles to prepare for the scientific experiment.
After the experiment, the teacher said to us, "Now do an experiment to see what can sink in the water." What can float in water? "Through experiments, students know that plasticine, iron sheets and small stones will sink when put into the water, while wood blocks, table tennis, foam and glass bottles can float in the water. The teacher asked again, "how can I make plasticine float in the water?" "I crushed plasticine by hand, then wrapped it in foam and threw it into the water. As expected, plasticine floated. When the teacher saw it, he shook his head and said, "Let the plasticine float, and nothing else can be used. "I must find another way. I squeezed plasticine into the shape of a boat and then carefully put it into the water. The plasticine boat floated on the water. I was so happy that I quickly invited my teacher to see my "masterpiece". The teacher smiled and nodded, and my heart was filled with joy. The teacher asked again, "can you make the glass bottle sink?" "Hearing this, I held the glass bottle high and threw it into the water. I thought I could sink, but the glass bottle climbed up quickly after drilling to the bottom.
At this time, I thought that when I was swimming, I could float with my breath held, and my breath would sink. So I opened the glass bottle cap, let the glass bottle die and fill it with water. At this time, I saw the glass bottle shake a few times and sink. Doing experiments by hands is fun and interesting, and you can learn a lot.
At the foot of Longjiao Mountain, by the Jialing River, there is a campus full of birds and flowers: experimental primary school.
At the beginning of school, all the students came to the campus happily to attend the opening ceremony. Accompanied by the melodious songs of birds, I walked into the campus. Hey, the campus has changed. After two months of renovation, the campus has taken on a new look.
On both sides of the school gate are two ginkgo trees, which seem to be specially designed to welcome the arrival of students. The breeze blew, and the ginkgo tree nodded politely to the students. Hey, why is the pinzi flower bed behind the ginkgo tree missing? Was it changed by a magician? Hey, how about a rockery? How could it be gone? Which stupid person moved mountains? Looking to the left, the original bumpy runway has been changed into a flat circular runway, and many trees have been planted next to the runway. Hey, what kind of tree is this? It will also prick your hand. At first glance, its leaves are very long. If you touch it, it will stab you with a secret weapon.
After removing the flower beds and rockeries, the campus has become much more spacious. Oh, it was to broaden our activities. Now the campus looks like a patchwork of trees, which makes it more spacious and bright, making people relaxed and happy.
On campus, some students play basketball, some students play table tennis, and some students get together in groups of 351 to talk and laugh, which adds a lot of vitality to the campus.
Experimental primary school, you are our cradle, creating a new environment for us, making us determined to grow up happily here, alma mater, I love you!
Experimental Sixth Grade Composition 15 Yesterday in science class, we did an interesting experiment.
We walked into the science lab (1), sat down quickly, and heard xu teacher say that today we were going to do a new experiment that we had never done before, and asked for group cooperation. We are very happy to hear it, because we haven't done experiments for a long time! Xu teacher gave us a demonstration. I saw her take out something similar to a mosquito repellent bottle, open the lid and stand upright on the table, telling us that it was an alcohol lamp. Then xu teacher took out a matchbox, took out a match, scratched the side of the box, and the match lit up. Everyone can't help but say, "xu teacher is amazing!" After that, the teacher lit the alcohol lamp from bottom to top with a lit match at the wick of the alcohol lamp, and the alcohol lamp ignited a small flame. Then the teacher put the lid on the side and put out the fire, and the experiment was completed.
It's our turn to do the experiment ourselves. After the group leader brought the alcohol lamp and matchbox, we imitated the teacher and began to do it. Zhang struck a match lightly on the box and the fire caught fire! I lit the alcohol lamp from bottom to top with a match. The flame is red and beautiful! Everyone said it looked good, and then Xu Jingyu took the lid to put out the fire, but her lid was covered, and the lid could not be put out, almost touching her hand. I quickly shouted, "Look out!" Xu Jingyu quickly removed his hand and put out the fire with a cover on his side! We are very happy.
Finally, our group completed the task assigned by the teacher!