Selected compositions for doing small experiments in grade one.

Science is really a mystery. We must study it, observe it and learn from it! Introduce the content of doing a small experiment in the first grade composition. It is convenient for everyone to learn.

Write a composition about a small experiment. The first grade is 1.

Have you ever done a small experiment? If so, let me have a look. If not, come and try it with me.

Let's take out a sunken table tennis ball first, then boil hot water, put it in a teacup, and pour the boiled water into the teacup. After a while, when you take it out, you will find that it is round again.

Do you know why? Tell me if you know, I'm anxious to know!

Do a composition for a small experiment, Grade One and Grade Two.

In the composition class, the teacher gave each of us a blank piece of paper, and asked us to draw a circle on the paper, then draw petals, paint them with our favorite colors, and then cut the flowers. I carefully cut along the line, thinking, what does the teacher want? That's weird. The teacher also asked us to fold the petals in and flatten them. Then the teacher brought a basin of water and said mysteriously, "Do you believe that flowers will bloom if you put them in water?" We were so curious that we all ran to put our flowers in the water. We looked at the paper flowers in the water without blinking, waiting for them to bloom with anticipation. After a while, the paper flowers in the water slowly opened and the water became a colorful garden.

The teacher told us that water has tension, so paper flowers will bloom in the water. This experiment is magical and interesting, so interesting!

Do a composition for a small experiment, Grade One and Grade Three.

As we all know, there is a wonderful flower in fairy tales-seven-color flowers. This flower has seven petals of different colors, which is incredible! In fact, this flower really exists in life! Yes, the experiment I did today was "Seven Color Flowers". This experiment only needs a white carnation, a knife, seven test tubes (or slender bottles) and seven kinds of colored pigments. First of all, with the help of my mother, carefully cut the stems of carnation into seven equal parts with a knife, then pour the colored pigments into seven test tubes respectively, and finally insert the seven stems into the test tubes respectively. It is best to tie the seven test tubes with ropes. Been waiting for almost an hour, huh? How do petals slowly become seven colors? I was surprised and happy when I saw it. I meditated in my room for a long time and didn't know what was going on. I was so anxious that I scratched my head and rummaged through all the science and technology books in the bookcase and finally found the answer. It turns out that plants need to absorb water, and colored pigments are liquid like water. Therefore, the flower stem "sucks" the pigment like water! I jumped three feet for joy after I understood, thinking: I can also take off my petals and make a wish like a little girl in a fairy tale!

Write a composition for a small experiment, grade one and grade four.

I have prepared an apple and two bowls, one of which is a bowl with salt water. First, I peel the apple with a knife and cut it into small pieces. Half in an empty bowl and the other half in salt water.

About two minutes later, I looked at the apples in two bowls. The apples in the empty bowl have begun to turn a little light brown; But the apples in the salt water are still the original color. What if they are left a little longer?

Ten minutes later, I went to see apples again. I found that the apples in the empty bowl have completely turned brown, like a rusty dress; The apples soaked in salt water are still the same as before, and nothing has changed.

The experiment I did is the same as that described in the book. The reason why apples in the air will change color is because they contain phenolic compounds, which will be oxidized when exposed to air, leading to the discoloration of apples. Moreover, salt can prevent apples from oxidation, so it will not change color.

This little experiment is really interesting, which gives me another scientific knowledge!

Do a composition of a small experiment, grade one and grade five.

At noon today, my mother and I did a small experiment-egg diving. We prepared four boiled eggs, four cups filled with half a glass of water, four hollow tubes and a plastic plate.

The experiment has begun! First, put the plastic plate on a cup, then put the hollow cylinder in the middle of the cup, and then put an egg on the hollow cylinder. Finally, quickly and forcefully pull the plastic plate. Wow! The egg plopped into the water. It worked the first time. Great! According to this procedure, I tried two eggs and two glasses of water, and it succeeded again. Wow, I'm really good. Then I tried three eggs and three glasses of water. Oh, dear! An egg rolled under the table. "I failed." I said sadly. My mother https://Www.ZuoWEn8.Com/: said to me earnestly, "Don't lose heart, failure is the mother of success." I got up the courage to try again and it worked. Finally came a big challenge, four eggs and four glasses of water, Oye! Four eggs fell into the glass one by one!

What is the principle? Gee, I seem to have seen this experiment-inertia-in the book "stubborn ghost who doesn't want to change" I hurried to find the book. It turns out that because of the inertia of maintaining the original shape, the egg will not move with the plastic plate, but will fall down and just fall into the cup.

Haha, my answer is exactly the same as that published by Crystal. Through this interesting experiment, I understand that we should be patient in doing experiments, do it wholeheartedly and slowly, and don't lose heart if we fail. Do you want to try, children?

Do a small experiment composition, grade one and grade six.

This morning, the teacher took us to do an experiment called "Eggs Floating".

The teacher took an egg, a transparent kettle and a bag of salt.

The experiment began. I saw the teacher put round eggs in the kettle first, and then filled the kettle with water. The teacher held the kettle high and asked the students, "Are the eggs floating?"? The students shouted "No" in unison! The teacher put the salt into the water again, took out the spoon and stirred it hard, but the baby egg seemed to just want to lie in the warm quilt and didn't want to come out to see the outside world at all. This made the teacher very anxious. He poured the salt into the cup and stirred it hard, but the egg still didn't float. Salt has covered the bottom of the cup, just like a layer of white yarn. The teacher sprinkled a little more salt and stirred it. This time, the egg hesitated and wanted to lean out and lie at the bottom of the pot. Then a classmate came up with an idea. He said, "You can take out the eggs first and stir them vigorously until the salt melts. "The teacher tried it, and soon the salt melted, and the teacher put the egg in the cup again. Sure enough, the eggs floated, and the students cheered!

Finally, the teacher told us the principle that eggs float because salt water has buoyancy. The teacher also told us: "The Dead Sea is located in Israel. The dead sea is high in salt. People can float in the water without drowning. "

Science is really a mystery. We must study it, observe it and learn from it!

Do a composition in a small experiment in grade seven.

Pine trees grow all over China, so it is not difficult to mature pine cones, which have many scales and are made of wood fibers. Wood fiber will stretch when wet and shrink when dry. Using this feature, we can make a pine cone into a clean and complete big pine cone, made of wood (or plexiglass, plastic board), glue and other materials. First, make the base as shown in the figure with wooden board or plastic board. Use wood file to smooth the pedicle of pine cone, and then use wood sandpaper to grind it. Make a pointer with a thin plastic stick or bamboo stick, and stick an arrow cut with blow-molded paper or white cardboard at the end. Select a suitable scale at the lower part of the pine cone, stick the prepared pointer on the scale with Black & Decker, and then adjust the position of the pine cone on the bottom plate so that the swing of the pointer corresponds to the background plate. At this time, stick the pine cones firmly with Baxter. Calibrate the pointer position in sunny days, and calibrate the pointer position in rainy days. Draw the sun and the umbrella separately, and the pinecone rain gauge will be ready. Put it in a ventilated place where the sun can't shine and the rain can't rain, and you can predict the weather changes in a few hours. From this experiment, I learned that brave innovation is victory.

Do a composition for a small experiment, Grade One, 8th grade.

Before, I once saw a very interesting scientific experiment in a science magazine: a bottle swallowed an egg. This experiment is novel and interesting. As long as I see it, I will do it. So I decided to try it myself.

I found the experimental materials at once. One morning, my mother had cooked the eggs, so I had to peel off the eggshell, a jar, a lighter and a candle.

At the beginning of the experiment, I asked my father to light the fire for me. I lit the candle and quickly put it in the jar. Then I put the paper in the jar. After the eggs were peeled off, I stuck them with my head down, stuck them tightly on the bottle mouth and stuffed the cork firmly. Suddenly, smoke, fog and dust filled the whole bottle. Is this a success? Not long after I said this, I heard a bang, and a miracle appeared: the jar swallowed the egg as if it were enchanted. I couldn't believe it.

"Wow" is amazing! "I clapped my hands happily and cried," My experiment succeeded! It worked! "

Do you know why the mouth of the bottle is so small and how the egg fell into the bottle instantly? So I looked it up online. That's because the atmospheric pressure inside and outside the bottle is equal, and the bottle mouth is smaller than the egg, so the egg can't be fixed. Put the lighted paper into the bottle, and block the bottle mouth with eggs. If the outside air can't get in, the paper will be consumed by burning. Oxygen in the bottle reduces the air pressure in the bottle, so the external air pressure is greater than the air pressure in the bottle. Internal air pressure, under the action of air pressure, the egg is pressed into the bottle.

This experiment made me understand that there is knowledge everywhere in life. As long as we are good at observation, it is really interesting to experiment again! Ha ha! In fact, everyone can be a small experimenter.

Do a small experiment on the ninth grade composition

Did an interesting little experiment. The theme of the experiment is "When tap water, white vinegar and alkaline water meet laver water". I saw this experiment in my Chinese summer homework, and I especially want to know if the result of this experiment is true. I begged my father to take me to the vegetable market to buy a seaweed. As soon as I got home, I couldn't wait to start a small experiment.

Now, let me tell you how to do this experiment. First, soak laver in boiling water for about half an hour until the water turns dark purple; Secondly, take out three transparent glasses, and add proper amount of tap water, white vinegar and alkaline water into the three glasses in turn. What is clear here is that some children don't necessarily know alkaline water. Our soap and washing powder all contain alkaline components, so it is ok to replace them with soapy water. Finally, pour https://Www.ZuoWEn8.Com/ into three glasses respectively. At this time, a miracle happened. Alkaline water turned into soft yellow-green, white vinegar turned into bright rose, and tap water turned into purple. It's amazing!

Why did this change happen? In order to find out the reason, I turned on the computer and searched online. It turns out that there is something called an acid-base indicator in laver, which is equivalent to a pH test paper and is used to detect the pH value. This substance will react chemically when it comes into contact with white vinegar and alkaline water, and turn red when it meets acidity and green when it meets alkalinity. Because tap water is neutral, the water with laver is still purple.

It's so interesting to do experiments by yourself. Not only enhanced my practical ability, but also let me know a lot of scientific knowledge. In the future, I will study harder and exert my ability by going up a storey still higher.

Write a composition for a small experiment. Grade one, 10.

Today, I did a small experiment at home, called magic changing water, and I became a "magician"!

First of all, you need to prepare experimental equipment: take seven measuring cups of the same size, three of which are put into 100 ml of water, and then three of them are put into 50 ml of water. Prepare the stirring rod and dropper, and you can start "magic"!

We drop three different colors of reagents into the prepared 100 ml water cup to make three primary colors. I carefully picked up reagent bottle, slowly dropped 5 drops of reagent solution, and quickly stirred the measuring cup with a stirring rod to make the red solution in the cup gradually uniform. The first cup of primary color solution is ready. Make yellow and blue in the same way. After that, we numbered the prepared measuring cup with 50 ml of water, and dripped 10 ml of red reagent and yellow reagent into the measuring cup with a stirring rod, and then a magical scene happened. The clear water in the cup turned orange. I can't wait to add the yellow solution of 10 ml and the blue solution of 10 ml to the No.2 measuring cup. Before I handed over my shift with a mixing stick, I thought to myself: What color will it turn into this time? Oh! Originally it was green, and slowly the two colors mixed together and became green. In the same way, the third cup is red and blue, huh? Why not purple? I remember the teacher told us in art class that red and blue can become purple! I touched my head, puzzled. Dad reminded me: "Do you want to read the instructions?" I picked up the instructions and saw a small line-"color concentration determines the experimental results!" " "oh! Originally, the color solution dripped less, so I immediately deepened the concentration of the solution. Sure enough, the color of the third measuring cup turned purple, and I smiled happily. The last step is to pour 20 ml of each three-color solution into an empty measuring cup, and with the help of a stirring rod, the solution turns black.

In fact, many colors can be mixed, so how did they get them? I looked up the information. The original three colors, red, yellow and blue, are three primary colors and are basic colors that do not need to be mixed with other colors. Red pigment only reflects red and absorbs blue and yellow. Similarly, yellow and blue are the same. When these two colors are mixed together, the brightness will be lower than their original brightness. The more color combinations, the more light absorbed, and the closer it is to black.

This experiment not only exercised my practical skills, but also inspired me to explore and think about scientific experiments. The magical change of water has given me the joy and enjoyment of the ocean of knowledge.