Composition science experiment (* * * six articles) 1 There is a lovely little doll on the windowsill of my house with a small paper pocket hanging on its chest. Don't look down on this little doll, let alone laugh at the paper bag that can change color! On cloudy days, the pockets turn pink, and on sunny days, the paper pockets turn light blue again. But I am not a magician, and this little doll is not a great trick. This is just a small-scale production of mine doll rain gauge.
In a science and technology month activity, the school called on each of us to make a small production. I went home and looked through a lot of information, and finally found the ideal small production of "doll's eye rain gauge". First, I dug out some small pieces of cloth from the closet and pulled out a mass of white cotton. With the help of * *, I made a little doll, and I drew beautiful facial features for it. After careful study, it is still quite good! Then it's time to make the main part of the rain gauge-the paper pocket. I ran around and finally found some chemical raw materials, cobalt dioxide, with the help of my teacher.
I cut the white paper into a small pocket first, then pour the cobalt dioxide into a bowl and boil it with water. The solution is red. I will soak the paper in the solution and take it out to dry. After trying for a few days, the weather did change, but my rain gauge didn't change at all. After repeated observation, I finally found that I didn't use absorbent paper, and the small pocket was not dry, but was dried by the sun. I am determined to make another one.
I found a piece of absorbent paper, cut a small pocket as it is, soaked it in the solution, and then put it on a plastic board to dry. Gradually, the small pocket turned light blue, and the sky was really clear at this time. The next day, I watched the weather first. Well, it's cloudy. I looked at the small pocket hanging on the doll and it turned pink. "Oh, it worked! Success! " I jumped for joy.
Why do small pockets change color? It turns out that cobalt dioxide contains red and blue pigments. Blue is rejected when the air in the sky is wet, and red is rejected when the air in the sky is dry. I looked at this small production made by myself and couldn't help but admire: "Science is wonderful!" "
Composition Science Experiment (* * * Six Articles) 2 Today, the teacher took us to do an interesting scientific experiment-friction electrification. On hearing the news, my heart is as sweet as honey.
The teacher first took out a rectangular piece of tissue paper, and then tore it into small pieces of paper and distributed it to us. Let's tear it into small pieces of paper. The little pieces of paper I tore off were like white ants. At this time, the teacher gave us a plastic pen to wear on our heads and wipe it back and forth. 10 seconds later, I gently put the plastic pen on the piece of paper. The paper flew to my pen like an enchanted spirit. It's amazing! Seeing this phenomenon, I am curious: "Will small pieces of paper really be enchanted?" Later, the teacher told us: "This is because the friction between the plastic pen and the hair produces static electricity, which sucks up the small pieces of paper." After listening to the teacher's words, I suddenly realized.
This experiment is really fun!
Composition science experiment (* * * six articles) 3 has just finished exercise 4, and I am worried that there is no theme. It's all right now. The next class is science. Great, it doesn't take much effort to get here!
Just after class, the teacher pushed a cart of materials, including wire and sandpaper, which we are most familiar with, and a blue, unknown liquid next to it. Hey? What is this experiment for? What miracle can these three things do together? Never ... I've heard Mr. Bao talk about how to do experiments with a questioning attitude. I heard Mr. Bao say, "This blue liquid can make this wire rust!" "What? Really? I really guessed right. Together, these three things can really work miracles.
As soon as teacher Bao handed out the materials, the whole class was boiling. Needless to say, all the students in our group can't wait to do the experiment, including me. When we were still studying the materials and didn't react, my front desk had picked up wire and sandpaper and started the experiment. First, sand the wire with sandpaper. After grinding for a while, we put the wire into the magic water bottle. At first, the wire didn't respond, and the blue liquid gradually turned green. "No change ..." I watched discontentedly, except that the blue liquid changed color, nothing happened ... As soon as this sentence was finished, my deskmate found out, "It changed, and the wire at the other end of the blue liquid was soaked. Really changed. It's not obvious in the water, but it's obvious when you take it out. The iron head is rusted like this. First of all, I want to know what that blue liquid is.
Before I could say what I thought, Mr. Bao seemed to see through our thoughts and said, "This blue liquid is called copper sulfate, but why is this?" Because sandpaper wiped off a thin layer of alumina on the surface of the wire, there was a red substance on the surface of the wire. The chemical equation of the reaction makes the reaction fully contact, and the iron wire gradually turns from silver to red. "
Teacher Bao's words answered my curiosity at once. Oh, I see!
Composition Science Experiment (* * * Six Articles) 4 When I was doing my summer homework a few days ago, I found that the book introduced a very interesting scientific experiment-"An unbreakable egg". Are eggs really unbreakable? This reminds me of the eighth lesson we once learned. Try it yourself. Just do it and the answer will be revealed soon.
According to the requirements of the experiment, prepare the materials: four eggs, a small board, several thick books and a large piece of plasticine. I started the experiment. First of all, I divided the plasticine into four balls and glued them evenly on the table, and put an egg on each ball. Second: put a small board on four upright eggs, and then put a book on the board. As a result, neither the chessboard nor the eggs have changed. I put eight books in succession. As a result, the eggs were really not crushed, but in the middle of several episodes, the eggs all fell. It was found that the viscosity of plasticine was not enough for eggs to stick. The experiment was successful. This experiment makes me happy and excited. That was my first experiment. When I was happy, my mother asked me: Do you know why eggs can't be broken? This stumbles me. My mother told me: Put the raw eggs flat and they will break when pressed. If it stands upright, it won't break easily. This shows that the strength of the same material depends on the shape.
Mom smiled and said, do you dare to sit? "Dare not", "Why", "Afraid of breaking eggs" and "This is just our guess, we can try, so with my mother's encouragement, I moved the experimental materials to the ground. I just sat on it, only heard the sound of banging, so I quickly looked down and two eggs were broken. Why? Eight books can't break four eggs, but as soon as I sat on it, I broke two eggs. Is this experiment fake? Mom asked me to weigh eight books first, weighing 2 kilograms. My weight is 29 kilograms, which is 14 times the weight of books, which greatly exceeds the weight that four eggs can bear, so the eggs are crushed. It seems that this experiment is really interesting. If dad sits on it, will all four eggs be broken? Do it, and you will know the answer.
Composition Science Experiment (* * * Six Articles) Five interesting experimental eggs float.
Today, we came to school and saw the teacher put two eggs, two spoons, a glass, sugar, salt, water and sprite on the platform.
We were puzzled when we saw what the teacher took away. We asked the teacher, teacher, what are we going to do today? The teacher smiled and said, Today, we are going to do a small experiment. The name of this little experiment is called egg floating. We are even more puzzled after listening to it.
The teacher first poured half a glass of water into the cup, then took out an egg and said, if I put the egg in the water, will it float? We said it without thinking, of course. Sure enough, the egg sank. I thought to myself, why does the teacher still ask us such a simple truth?
Then, the teacher picked up a small spoon, fished out the eggs and put a spoonful of salt into the water. The salt soon sank to the bottom. The teacher holds a cup in his left hand and a spoon in his right. The teacher stirred the cup wall clockwise with a spoon. At first, the water became turbid and gradually became clear. The teacher said it was because salt dissolved in water. The teacher asked us again: Will the eggs float? We said: it won't float. The teacher picked up the egg and put it in the glass. We all held our breath and stared at the glass. Unexpectedly, the egg floated up, and the teacher pressed it down again, and the result came up again. We were so surprised that we even suspected that the teacher had put away the cups or eggs.
The teacher said: this is because the density of salt water is greater than that of eggs, so salt water can make eggs float. This is really a breakthrough! It dawned on us after listening.
Then, the teacher did two experiments, namely, putting eggs in sugar water and putting eggs in Sprite. As I expected, the egg floated up. Because sugar water and sprite are denser than eggs.
Through this experiment, I understand the truth that any liquid whose density is greater than that of eggs can make eggs float. This is really an interesting experiment.
Can six stitches float on the water in the composition science experiment (* * * 6 articles)? Can the needle "backstroke"?
Today I did an interesting little experiment-the needle floated on the water.
Every household has a needle, but how can it float on the water? I was curious and started the experiment. First, prepare a sewing needle, a big bowl filled with water, an ordinary napkin and a toothpick for my mother.
I spread the napkin flat on the table first, and then put the needle on the napkin; Then, I picked up both ends of the napkin with both hands and gently put it on the water with the paper tape needle. Suddenly, the white napkin became transparent and floated evenly on the water. I couldn't wait to pick up the toothpick and take it out of the bowl. I didn't expect the needle to fall into the bottom of the bowl and the experiment failed. I think it is possible that the paper is not completely saturated.
The second experiment began, and this time I was not as anxious as last time. After the four corners of the napkin sank, I saw that the middle part of the paper was still motionless, and the needle and the paper were still tightly together. So, I picked up the toothpick, gently pressed the napkin into the water, and then gently fished it out of the bowl with the toothpick. I did it very carefully, and I didn't even dare to blink, for fear of touching the needle. When the napkin was completely fished out of the water, I saw the needle floating firmly on the water. I am happy to take a toothpick and say loudly, I succeeded! I made it!
But why can the needle float on the water?
Then I thought of the computer, so I looked it up on the Internet. It turns out that the surface of water has a certain tension, and the surface tension of water supports the needle, so the needle will not sink. I know that needles can float on the water. Seeing the sewing needle floating freely on the water, my heart is really unspeakable.
It turns out that a small sewing needle has such a big mystery. You must do more experiments in the future to enrich your knowledge and bring fun to yourself.