Fifth grade experimental composition

In daily study, work or life, many people have experienced writing and are familiar with it. The composition requires a complete text structure, and an endless composition should be avoided. Do you know how to write a good composition? The following are eight fifth-grade experimental compositions carefully arranged by me. Welcome to reading. I hope you will like them.

At noon today, I did an interesting experiment-boiling water in a paper pot.

I rummaged through everything and finally found the experimental materials: a small paper basin, candles, lighters and water. I started the experiment-boiling water in a paper pot.

I lit the candle first, and a cloud of black smoke came out in an instant. Then he took the small paper pot filled with water to the top of the candle and thought, "This paper pot will definitely catch fire." However, the paper pot was not lit by fire. After a while, I blew out the candle and dipped my hand into the water. It's too hot.

Why can't fire burn a paper pot full of water, but boil the water in it? This question aroused my curiosity. So, I looked up some information on the Internet. It turns out that at a standard atmospheric pressure, the boiling point of water is 100 degrees, and the ignition point of paper is 183 degrees. When water is boiled, it absorbs heat from the paper pot continuously. Even after boiling, the temperature of water remains unchanged, so that the temperature of paper does not exceed 183 degrees. This way, the paper pot will not be lit by fire when the water is boiled.

As long as you dare to explore and practice, you will surely discover the mysteries of nature.

The second part of the fifth grade experimental composition is in class. Xu teacher smiled and said to us, "Let's do experiments in this class." Suddenly, the classroom became lively and exploded like a handful of salt spilled in the oil pan. Xu teacher began to prepare for the experiment. She brought a small transparent plastic bag and a candle. Then, mysteriously said to the students: "After a while, the teacher lit a candle on the platform and covered it with a small transparent plastic bag. Students should pay attention to observe what changes they have, and think about what the principle is? " Suddenly, the students opened their eyes wide, waiting to see what magic xu teacher was going to perform. At the beginning of the experiment, xu teacher first lit the candle, then covered it with a plastic bag, which slowly expanded. "Ah! Why is it swollen? I said. Suddenly the teacher let go and the plastic bag flew. The classroom is boiling: "Strange, how do plastic bags fly?"? "Classmate, you took me back to talk about it. Xu teacher, strike while the iron is hot. Let's talk about the principle of hot air rising first. There was silence in the classroom at this moment, and everyone looked at me. I look at you, I'm afraid I can't tell. At this time, Huang Wei raised his hand and said, "Because hot air is lighter than cold air, hot air will rise." Suddenly, thunderous applause rang out in the classroom, and everyone gave Huang Wei a favorable look. Then, the students spoke in succession. This course is really interesting! It makes us understand that science has endless mysteries waiting for us to explore.

Yesterday afternoon, the teacher came in and said to us, "Students, go home and do an experiment today. Put soy sauce and water in the refrigerator and observe how they change. " As soon as the teacher's voice fell, the whole class began to talk. Most students think that soy sauce and ice will freeze; A few students think that soy sauce will not freeze.

I can't know who is right at the moment, I think: listening is empty, seeing is believing. I went home to do the experiment with curiosity.

When I got home, I threw my heavy schoolbag aside and went to the kitchen. I first took out two plastic cups as liquid cups, then poured soy sauce and water into the two cups, then put the two cups into the freezer of the refrigerator, and finally put the soy sauce back. A few hours later, I went to bed. Before going to bed, I have been thinking about these questions: will soy sauce freeze? What color will it turn if it freezes?

When I woke up the next day, I couldn't wait to get out of bed to see what the soy sauce and water in the refrigerator had become. When I got to the kitchen, I opened the refrigerator. Ha, water has become crystal clear ice, just like delicious pudding. But soy sauce is just covered with frost, just like wearing a "big cotton-padded jacket". How did this happen? Soy sauce actually freezes, so I checked Baidu and found out: who is a pure liquid, as long as the temperature reaches 0 degrees Celsius, it will freeze; Soy sauce is a mixed liquid, which will only freeze at MINUS 30 degrees.

Through this experiment, I understand that life is full of knowledge. As long as you are willing, you can find more knowledge.

I like painting. When I finish painting, I must color it. Everyone says, three-point painting, seven-color separation. Color matching is even more important.

How to match bright colors? I looked in "100,000 Why" and the computer. Finally, I found some relevant information and started the experiment.

I have prepared 10 colors: red, orange, yellow, green, cyan, blue, purple, black, white and gray. Then use it to prepare trays and markers. Concentrate on color matching. I squeezed a little black first, then a little yellow, then a little red. I mixed them together with crayons. Let me see, hey! It's brown! It's incredible!

Then, I set off pink with orange and white; Black, blue and yellow are used to produce dark green; Then use cyan, blue, purple and white to set off the light blue. I used the color 10, which brought out a lot of colorful colors.

So this experiment is so interesting! It opened my eyes, and I don't have to worry about painting and coloring in the future. I will be able to draw vivid pictures.

For example, if I want to draw a character's skin color, I can mix red, yellow and white to draw; I want to paint the beautiful scenery in early spring. The grass is green, and the leaves just found on the tree are also green.

The blue and yellow color is light green, which I carefully painted. How environmentally friendly and beautiful the picture is!

By doing experiments, I know that it is not easy to do a good job. I tried to adjust it while taking notes. It's easiest to try to adjust the tender green!

Huang Jialan But if blue is more than yellow, it becomes green, and yellow is more than blue, it becomes light green. Colors are ever-changing, and it is this endless phenomenon that interests me greatly.

I experimented over and over again, bringing up various colors in my imagination.

By doing experiments, I learned a lot of knowledge that I couldn't learn in class. This weekend is really meaningful, which has increased my confidence in learning painting well.

I like science very much. I have been studying future scientists and happy science since the first grade of primary school. I often read these books, and I have done many small experiments in them, such as: undulating eggs, strange creatures, poisonous vegetable salads, harmless nettles and old fruits. ...

One day, when I was having breakfast, I took an egg, peeled it off, accidentally slipped down, bounced it, and then broke it. I am reminded of the experiment "Jumping Eggs" in Future Scientists. So, I asked my grandmother for a big egg, poured 150 ml vinegar from the vinegar bottle into the bowl, took a glass, and began the experiment on my desk. I put the egg in the glass carefully first, hoping it won't break. Then pour the vinegar into the cup and don't eat the whole egg. Soon after, the egg bubbled, and after a while, the skin on the surface disappeared. Put the eggs in this cup of vinegar for two days. Turn it over several times to make sure the egg sinks to the bottom. If bubbles make the egg rise, hold it down with a spoon. Two days later, I succeeded. The eggshell was gone and bounced four or five centimeters. I am very happy!

This experiment inspired me: no matter what you do, you should practice more and be careful again. You can't always depend on your parents and others. Only by our own efforts can we master the skills of survival and not be eliminated by society. I will use my knowledge to serve the society and the motherland.

Today, in the comprehensive practice class, the teacher assigned us a special assignment, that is, told us to go home and do a light game experiment.

After school, I went home to do my homework first, and then I did this experiment. I started the experiment. I first took a piece of white paper and drew a butterfly on it. Then, I went to get a transparent basin and put it on paper. At this time, there was no water in the basin, so I sat on the edge of the table and didn't see the butterfly under the basin. Then, I picked up a cup of tap water already prepared and poured it into the basin. Ah, the miracle happened soon. The butterfly under that pot can actually be seen. I think I succeeded in this experiment. What will happen if I eat sugar instead?

So, I put a piece of sugar in the basin. Can you guess that you can see sugar now? Of course I can see it! If you don't believe me, you might as well do the experiment yourself. So we can know whether we can see the butterflies on the paper and the sugar in the basin, right?

Through the experiment, I know it is not difficult to do an experiment well. The difficult thing is that you should be patient when doing the experiment. If you are patient and follow the experimental requirements, you can succeed in any experiment.

Today, Teacher Ye had a special composition class-doing experiments. We all cheered loudly for joy.

The teacher mysteriously brought a basin of water, a cup and a piece of hard paper.

Board of directors. I wonder what experiment I will do. Students blurted out: it must be to fill the cup with water, then cover the cup with paper and turn it upside down so as not to fall off. I didn't know until I heard it. I saw the teacher fill the water, cover it with cardboard, then hold the cardboard down, and then quickly turn the cup upside down and say, "Do you think the water will pour out?" Everyone said in unison, "No!" But I think this water is so heavy and this cardboard is so light, how can it not leak out? I stared at the teacher's every move to see if he could make a difference. The teacher said, "Who will try to enlarge the cup on the head and see if it can be poured out?" But no one dared. At this time, the teacher's hand slowly moved away, and the water did not pour out, but it was still dripping. I'm confused.

The teacher said, "There is a mystery. This is the scientific principle. " The teacher said, "When the cup is filled with water, there is no air, but there is air outside the cup.". This air has pressure and keeps pushing the paper up, so the paper won't fall. " I just understand.

Today is the weekend, when I was bored at home, I suddenly had an idea: I want to do an experiment to judge whether the eggs are cooked or raw by scientific methods. I have seen this experiment in books before.

I first go to the kitchen to get two eggs, then put an egg in the pot, boil the water with a gas stove, and take out the eggs after they are cooked.

I first took out two eggs that had been boiled all my life and the washbasin, poured water into the basin, put the eggs in, and the two eggs slept at the bottom of the basin at once. I waited and waited ... but two eggs seemed to be asleep at the bottom of the basin, and I never saw any effect. I thought to myself: Wait until the Year of the Monkey! Why are these two eggs so disobedient?

When I knocked on my forehead, I forgot to put salt in the egg when it was raw and cooked. The book says it was tested with salt water. No wonder it didn't work. I must do the experiment again.

But this time I didn't use the salt water detection method, and the salt at home was not enough for me, so I adopted the "rotation" method. I put two eggs on the table. Raw eggs and cooked eggs are exactly the same, like twin babies. I held both ends of the egg with my thumb, and suddenly my fingertips exerted force, and an egg turned like a top. I turned another egg in the same way. Two eggs were dancing Latin on the table, and I stared at them without blinking an eye to see who was spinning fast. Then, I reached out a finger, held down the center of an egg, and quickly raised my hand, and the egg immediately stopped spinning. Well, the braking system is good! I put out my finger again and pressed it on another egg. The egg stopped spinning at once, but when I raised my finger, the egg turned again, as if it were unstable.

I suddenly understood. I pressed it with my hand and stopped. It was a hard-boiled egg. When I pressed it, it moved. This is a raw egg, because it is filled with liquid. After the egg stops suddenly, the liquid inside will continue to flow, so only the raw egg will continue to rotate. Yes, I did it! I am a little scientist!

A small experiment also made me understand a truth: do everything with your heart, so that you can do it better!