Grade five experimental composition 1 We have to practice to discover the infinite mystery of science.
While reading, my father said, "Don't read yet, let's do a scientific experiment." As soon as I heard this, I got excited, closed the book and looked at my father.
"This experiment is called' bottle sucks eggs'. First of all, you need a bottle with a mouth a little smaller than an egg, a boiled egg, an eggshell, a lighter and some dry paper. " Dad said.
All the materials are ready and the experiment has begun. First, I picked up the boiled egg, peeled it and tried it on the bottle mouth. The egg is bigger than the bottle mouth. I found some dry white paper and put it on the table. It went well at first, but it was blocked when I got to the lighter.
I dare not take a lighter for fear of burning my hands. I was scared when I looked at the lighter. I was even more frightened when I saw the oil in the lighter. With so much oil, the flames will definitely jump up and my hands will be burned. Dad said, "Don't be afraid. Well, how about this? You go to the kitchen and practice lighting the fire with a lighter. If you burn, rinse with water. " I nodded in agreement.
I walked forward bit by bit with a lighter. The distance from the living room to the kitchen is very close, but I think it is as difficult as the Red Army climbing the snow-capped mountains across the grass. I was so scared and nervous that I had to comfort myself: I'm not afraid, there's nothing to be nervous about. Well, I have to bite the bullet and go.
When I came to the kitchen, I tried to press the ignition button. I can't even blink, and my heart beats faster. The flame burst out, but it didn't burn your hand.
I strode to the living room, successfully burned the paper with a lighter, put it in quickly, and then put the egg in the bottle mouth. The egg was sucked into the bottle at once.
Dad said: "When the fire in the bottle burns, the gas in the bottle is small, and the outside gas pushes the eggs." I nodded my head.
The world is full of miracles. We should explore, practice, understand, discover and love science.
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.
This afternoon, my mother hummed a ditty and said to me, "Let's do a mysterious experiment!" " "Looking at my mother's mysterious face, I can't help but get suspicious. I thought: what medicine is sold in mom's gourd?
I dare not neglect, and immediately ran to the kitchen to find the materials needed for this experiment. Soon I found a glass and a bottle of hot water, and then I dug up a lot of broken ice from the interlayer of the refrigerator with a shovel, sprinkled some salt and wrapped the ice with a towel.
When I was ready, my mother's mysterious experiment began. My mother first instructed me what to do and told me the process of the experiment in detail. I rushed forward step by step and immediately lifted my glass with my mouth. The mother who had already prepared poured a lot of ice cubes into the cup, and the white "little angel" danced gracefully.
Then, my mother came panting with a thermos bottle and poured steaming water into the cup. Those lovely "little guys" jumped into the glass to take a bath, only to see ripples in the glass and hot air.
Just then, my mother suddenly took my hand and ran behind a wall. I heard the glass smashed with a bang, water splashed everywhere, and glass fragments were all over the table, which was a mess. I was dumbfounded and thought: how did this glass break for no reason?
After listening to my mother's detailed explanation, I suddenly realized: "This is scientific, and it is called' expansion with heat and contraction with cold'. The volume of a glass expands when heated and contracts when cooled. If it exceeds the volume of this object, it will break.
It turns out that this kind of broken glass has scientific principles.
An unremarkable glass contains such a profound mystery, and the science in life is around us, just for us to discover, explore and pursue.
I came back from the hospital last night with a lot of medicine. I took medicine this morning. This medicine is too bitter! My tongue felt me and told me. I became interested in the tongue and did an experiment in my spare time.
I took some sugar, vinegar, salt and herbal tea, prepared clear water and started my experiment.
I dipped all kinds of spices into various parts of my tongue and got the following conclusions: the tip of my tongue can feel sweet, the edge of my tongue can feel sour, the whole tongue can feel salty and the root of my tongue can feel bitter.
In order to find out the mystery here, I collected information on the internet before I got the answer. From it, I learned that there are four basic flavors on the tongue, namely sweet, salty, sour and bitter. They are responsible for transmitting taste signals to taste nerves and then to the brain. The taste buds in charge of these four flavors are distributed on the surface of the tongue, but they are not uniform. From this, we can know that when we eat, not every position on the tongue can obviously feel a certain taste!
Take the medicine! This is a common thing in life, but I get pleasure from it. I found its mystery on my tongue and couldn't help sighing. It is really "endless learning"!
This afternoon, Mr. Cheng came into the classroom with a cup of sewage in his hand and said to us with a smile, "Today, I will do a little magic for you. I can turn this cup of sewage into a glass of water. " We all looked at her doubtfully, wondering which "artifact" she used to turn sewage into clear water.
Then, Mr. Cheng began to work. She folded a piece of white toilet paper four times and changed it into a strip of toilet paper. Then, she took one end of the toilet paper and put the other end into a container filled with sewage. I stared intently at this cup of sewage and that piece of toilet paper, and found that the lower part of the toilet paper was quickly soaked, and then slowly "climbed" up like magic, and the cleaner it got. I thought to myself, "Does Teacher Cheng really have magic?" My heart is full of questions, and my mind is full of question marks. At this time, the water finally reached the "peak" and then slowly spread to the other side. A female classmate on the side saw it and quickly reached under the other end, waiting for the crystal drops to flow down. Lovely little water drop "dare not jump anyway", like a shy little girl. At last she jumped down. At this time, some students stood up, some sat in their seats and stared at the exposed end of the toilet paper with bated breath, and some simply went to the projection cabinet to observe it carefully. At this time, there was a lot of discussion in the classroom, and no one knew that the sewage would become clear.
Suddenly, Mr. Cheng said to us loudly, "This is because toilet paper can be filtered. When the sewage passes through a gap, the soil will get stuck in a small gap, so the sewage becomes clear water. " As soon as we heard it, we suddenly realized.
I gained a lot of scientific knowledge through this little experiment.
Grade 5 experimental composition 6 Hey, Mr. Wang of Class 4 in this composition class is standing in front of the podium of our class with a mysterious face. What does he want?
I saw Mr. Wang bent down carefully and took out a pink bag from under the podium. The students talked about it one after another, some said it was food, others said it was cosmetics. Teacher Wang smiled and took out two sets of beakers from the pink bag, each with a small glass bottle. This is not a science class. Why bring a beaker? Do you want to do an experiment? Our minds are full of question marks.
Sure enough, Miss Wang began to do experiments. He first filled the beaker 1 with tap water, and then filled the vial with water. Then he took out a pen from his pocket, squeezed four pieces of ink into the vial, and then pressed the vial with his thumb and shook it vigorously until the water and ink were evenly mixed. Finally, he gently, straight and slowly put it in a big beaker and tied it to a small bottle with a thread, just like a careful mother put the baby in the cradle. "It's going to overflow." Some students can't help but say. However, a miracle happened, and the ink in the small bottle didn't leak out at all.
The seventh experiment of the fifth grade experimental composition-making drinks
Do you know how the drinks sold in the supermarket are made? Some people say, "Fruit is squeezed out!" I will tell him that his family is squeezed with fruit, and many of the products sold in the supermarket are made of food additives. Do you believe that the juice content of many food additives such as fruit orange in the ingredient column of beverage bottles is 10%?
Next, let's do an experiment and talk about how drinks are made.
We are the first people to make apple-flavored drinks. First, we take a test tube, add half a tube of water, and add a little lemon yellow and bright blue to match the color of apple juice. Wow, it's exactly like Fanta apple soda! Next, add sweetener acesulfame or xylitol, and then add apple flavor essence. I think it's done, but the chemistry teacher told me to add sour agent to make it taste better. After listening to it, I soon found that malic acid was added a little. If you want to turn it into soda, you need to add leavening agent. Now you know how to make drinks!
Although this drink is not poisonous, it has no nutrition at all. Can you drink?
Later, I also made grape, peach, lemon and other flavors of drinks according to the demonstration, and also made strawberry milk. I think I have become a master of drinks! I will drink less drinks sold outside in the future. If I want to drink, I can squeeze real juice at home!
In the afternoon, the sun shines warmly into the French window, which makes people sleepy lazily.
Holding a book "Into Science", enjoy this wonderful "reward" comfortably. "Homemade carbonated drinks?" My pupils are dilated. Just bought it in the store, made it yourself? This is incredible. Research shows that many important discoveries and research results are obtained through experiments. Let me show you.
I took out 250G cold boiled water, 1.5g lemon juice, 8g white sugar, 1.5g baking soda, 500ml beverage bottle, and a proper amount of juice from the refrigerator. Prepare the materials and start my "great" exploration journey.
I carefully put eight sugars into the prepared beverage bottle, and then injected a proper amount of juice into it. This is baking soda. Finally, I poured 250g of cold boiled water into it, then screwed on the bottle cap and looked at it satisfactorily before putting it in the refrigerator.
After waiting anxiously for half an hour, I couldn't wait to open the refrigerator, and Chengcheng Huang's lemon-flavored carbonated drinks were "born" from my hands. After appreciating "color", the next step is to taste "taste". I unscrewed the bottle cap and heard a familiar "yi-"sound, which produced a series of bubbles in the bottle.
I screwed on the bottle cap and jumped up to share my work with my brother. The drinks in the bottle jumped up and down because of the pressure, and the bubbles that just disappeared played hide-and-seek with me again. When I stop, they will soon disappear again. So what gas is in this bubble? I look puzzled. "Books are our best teachers" was mentioned, and the teacher's teachings rang in my ears. I rushed over and picked up the book "Into Science". I found the answer in the book. It turns out that sodium bicarbonate reacts with citric acid to generate carbon dioxide gas, and carbon dioxide reacts with water to generate carbonic acid. So this is the origin of carbonated drinks. And those naughty little bubbles are actually carbon dioxide, and I suddenly realized.
In order to get more accurate experimental results, I thought of using chemical methods to find out whether the gas in the bottle is carbon dioxide or not. I ran to school and asked the chemistry teacher to explain this conjecture with me. We first collect some gas in the bottle by drainage, then drop a few drops of clear lime water and shake it gently. I can clearly see that the limewater has become turbid. According to the theory that carbon dioxide can make clear limewater turbid, my guess was further confirmed, and all my doubts were solved and I suddenly realized.
There is so much knowledge in a small bottle of drink. It seems that science is everywhere around us! Experiment is the only way to truth. Students, let's understand and master science together. Qi Xin opens the door to truth.
The ninth article of the fifth grade experimental composition "Paper can contain water!" I was reading a book and was attracted by the title. Looking at the above experimental steps, my hands have been itching. I decided to do it!
I eagerly took out my cup, paper and water. Because the process was so simple, I didn't read it carefully at all. Then I pour water into the cup and wrap the cup in paper. The next step is to reveal the answer! Excited and scared, I stretched out my hand and shrank back. After several hesitations, I took a deep breath, unconsciously closed my eyes and turned the cup upside down. After a while, I felt the sound of water ticking. I opened my eyes-the water flowed relentlessly through the paper and was already on the ground! Oh, what a pity! How difficult it is to do an experiment well! I won't do it! If you fail, you still have to waste water. It's easier not to do it. But on second thought, if I can't even do small things well, I won't mention doing big things in the future! Action is better than heart, so I picked up a science book and swept my mistakes. After a while, I seemed to find my mistake and my eyes were tightly glued to it. Oh, I see-the glass should be full! I picked up the materials at lightning speed and continued my experiment. ...
It's the last step again, and my little heart is about to jump into my throat! I turned the cup upside down-the paper covered the water! The experiment succeeded! But what is the reason why paper can contain water? I looked it up online. It turns out that water is wrapped in paper, because the air pressure in the cup filled with water is blocked, and the pressure is naturally small. In addition, the water surface has expansion force, so that the water can be firmly fixed in the cup and the paper is sucked on it. Finally, air and water blocked the water in the cup. I suddenly realized.
Through this experiment, I know the mystery of science, and think that scientific knowledge is boring, but scientific experiments are interesting, so if you go deeper step by step, you may be attracted, so science is a magical term that is both boring and interesting!