Chemical experiment composition

In the usual study, work and life, we often see the figure of composition. According to the different writing time limit, it can be divided into limited composition and unlimited composition. I believe many friends are very upset about writing a composition. The following is the chemical experiment composition I collected for you, for reference only, and you are welcome to read it.

Chemistry experiment composition 1 On Saturday, my mother and I, as well as a colleague of my mother and her son, took us to the laboratory to do chemistry experiments as soon as we finished our homework. My aunt's son is a few months younger than me. He is my brother.

After finishing my homework, there was only one blog post left, and my mother had just finished class, so my brother and I went to the laboratory to do chemical experiments as we wished.

As soon as we got there, my mother gave us a "magic trick": she picked up a glass bottle with transparent liquid, poured a little into the test tube, then picked up another glass bottle with water, poured a little into the test tube, and then shook it gently. Suddenly, the liquid that used to be like mineral water in the test tube turned into a pink liquid.

Why is this? It turns out that mother poured alkali for the first time and phenolphthalein for the second time. Phenolphthalein was originally colorless, but under the action of alkali, the color of phenolphthalein turned pink. I see, the chemistry experiment is really interesting!

We also did many interesting experiments that day. Chemistry is really wonderful!

There are many anecdotes in life: people have discovered the secret of pumpkin with a face, nail-shaped toffee has passed through coconut shells, and hard stone chips have drilled flowers and plants, which have moved me and made me curious.

In order to know why the spicy strips we often buy are harmful to human health, my mother and I went to the food inspection room of her unit to conduct an experiment. The name of the experiment is "Measuring Arsenic Content in Food".

In the first step, we put a bag of spicy strips in a mortar and grind them with a hammer. Step 2: Weigh 5g of ground Chili powder with an electronic analytical balance. Step 3, put the weighed sample into a crucible filled with chemical reagents. Fourthly, putting the crucible into a water bath to be evaporated. Step 5, put the crucible on the electric furnace and grind the spicy strips into carbon blocks. Step six, turn the carbon block into white ash in the muffle furnace. Step 7, dissolve lime in a volumetric flask with a big belly and a small mouth, and fix the volume in it. Step 8: Use a pot-bellied pipette to suck 20 ml of liquid and pour it into an arsenic measuring bottle. Step 9, put the chemical reagent and 3 grams of zinc particles into the bottle. At this time, there will be a violent reaction in the bottle, and there will be a "snapping" sound from time to time. It is really interesting!

My mother told me that the gas generated by the reaction reacts with the test paper at the top of the bottle, and the test paper will produce yellow stains, which are larger than the standard stains. Results The arsenic content in our spicy strips exceeded the standard, which would be very harmful to human body.

This experiment is really interesting! However, after hearing that spicy strips are harmful to human body, students please stop eating this snack!

Chemical experiment composition 3 I came to the Science and Technology Museum to prepare for a chemical experiment class.

When we came to the classroom, the teacher asked us to introduce ourselves first, and then began to lecture. The teacher asked a question: Do you know what the three major fire sources are? We all don't know, the teacher announced the answer, that is, fire, flammable materials, oxygen. With these three things, you can make a fire.

The teacher also gave us several experiments, so that we can do this little experiment when we go home. We can find a cup, take a plate full of water, take two candles one high and one low, and take a small plate. Put the candle in a small plate, light it on the plate and cover it with a cup. That's it! Then the teacher let us see, oh! Both candles are out! The teacher told us: "Because there is no oxygen, the fire can't rise!" " "Sure enough, the teacher witnessed to us that none of the three major fire sources would not rise.

The teacher gave us many experiments about fire. What a great harvest today!

Chemistry Experiment Composition 4 Today, our "Green Apple" summer social practice team had an interesting chemistry experiment class. In the chemistry laboratory, six kinds of liquids and two kinds of objects, three test tubes, a stirring rod, a pair of tweezers, a measuring cup, a beaker, a thermometer and two pieces of paper are prepared on each experimental table.

Teacher Deng asked us to do experiments with these items ourselves. I tried it in the east and west, and found some interesting phenomena through repeated experiments.

For example, after adding phenolphthalein solution to sodium hydroxide solution, water becomes purple, and after adding dilute hydrochloric acid, water becomes colorless again.

Another example: put the copper sulfate solution in a beaker, then put the nail in the beaker, and take out the nail after two seconds. At this time, you will find that the nail surface is actually covered with a layer of copper!

For example, pour water into a beaker, measure the water temperature with a thermometer, and then add ammonium nitrate solid. The more, the better. Touch it with your hand, and a coolness rushes into your palm. Ah, the water is getting cold! Measure the water temperature with a thermometer again, and you will find that the water temperature has dropped by 8 degrees!

We also put the marble into dilute hydrochloric acid and found that the water began to bubble. I smelled it by "fanning". Wow! The smell of smelly fart really hit my nose and made me faint on the spot! A scene flashed through my mind: carbonated drinks such as Coca-Cola won't … Oh, my God, I'll never drink carbonated drinks again!

This experiment class is so interesting. I hope to provide us with more opportunities in the future, so that we can broaden our horizons and increase our knowledge!

Chemistry Experiment Composition 5 Childhood is beautiful. Like shells in the sea, bright stars in summer nights. One of my most unforgettable things is the interesting experiment. One day, my mother was preparing steamed bread with flour. I watched my mother put a little alkaline noodles, and the noodles suddenly turned yellow-green, with an alkaline smell like fried dough sticks. Soap also has this taste. I am curious to think, what will it look like if alkaline noodles and acidic vinegar are put together? I asked my mother, and she said, "It seems to have turned into salt." I don't think the acidity of mature vinegar is as strong as that of sulfuric acid, so let's start the experiment. Mother put a little alkaline noodles first, then some aged vinegar, and only heard a beep. The alkaline noodles were full of foam. My mother said to me, "Stir it quickly!" " "I stirred it with chopsticks, the color is the same as that of old vinegar, but it tastes like alkali and vinegar. I think the alkaline side is white, so the color is the same as that of mature vinegar, and the alkaline side is particularly strong, so it has an alkaline taste. I tasted it and immediately "wow". Bitter and astringent, it's not delicious at all. It tastes worse than Chinese medicine. Thank me for my only use. The smell stayed in my mouth for a long time, and I couldn't get rid of it. Later, I found out that there is acetic acid in vinegar and sodium carbonate is sodium carbonate, and the two will react and produce many bubbles. Science is so wonderful and interesting!

I have read the stories of Chinese and foreign scientists. The word "experiment" is not strange to me at all, but it is the first time I have witnessed it.

This afternoon, Novartis's uncle and aunt walked into our school to carry out the "Little Scientist Activity" and gave our third-grade classmates a lively and interesting chemistry experiment class. The whole theatre of dreams was crowded with people, and we all leaned out our heads, craned our necks, widened our eyes and focused on the center of the stage. I saw an uncle in a white coat put a cylindrical container with two empty ends on the plate, a measuring cylinder in the middle and detergent, water and baking powder on the side in turn. Everything is ready and the experiment has begun. Now put a proper amount of water into the measuring cylinder, then pour in the detergent, and finally add baking powder and stir with a small stick. This stick seems to have magic. After only a few times of stirring, wonderful changes have taken place in the measuring cylinder: first, the bottom is dark orange, and then it slowly faints until it fills the whole measuring cylinder. At this time, my uncle told us that the liquid mixed with these three substances could be used to clean the elephant's teeth.

There are napkins that can burn without ignition, and the color of water can turn green and pink. What attracts us more is that I can try it during the experiment. I also go to hands in the air, hoping to experience it for myself, but I can't because of the limited time. However, wands, color changes and various experimental appliances have opened a scientific door for me, letting me know that there are still many mysteries in life waiting for us to explore.

It's hot in summer, and my favorite drink is iced soda. I really want to know how soda is made.

Today, Xu Feng, a chemistry teacher, gave us a magical chemistry lesson. Let's make our own soda by ourselves.

The teacher took out four kinds of white powder, and we separated sugar, salt, baking soda and citric acid. They all look the same. What shall we do? We divide it according to what we eat. I tasted a little of each kind, and the taste was different, so I separated at once. Sugar is sweet, salt is salty, baking soda is tasteless, and citric acid is sour.

The teacher asked us to put baking soda powder in sugar water, salt water and citric acid water to see which water has bubbles. Results When baking soda powder was put into citric acid water, many bubbles were produced. We did an experiment of blowing balloons with mineral water bottles. Pour citric acid water into an empty mineral water bottle, put baking soda powder into a balloon, and then put the balloon on the bottle mouth of mineral water. A magical phenomenon appeared. The balloon blew up and became bigger. It's really interesting.

I am looking forward to making soda. I add sugar, juice powder and baking soda powder to an empty mineral water bottle, pour pure water, add citric acid and tighten the bottle cap. Shake the bottle, there are many bubbles in the bottle, and the soda is ready. I took a few sips. It's delicious.

I am very happy to make soda today! I want to say to the children: "soda is delicious, but you can't drink too much." Drinking too much is not good for your health. "

Chemistry Experiment Composition 8 "Ah! How amazing! The water has become transparent. " The students screamed with excitement.

Why do students scream? Because in science class today, the teacher did a magical experiment.

The experiment began, and the students stared at the science teacher's hand. The science teacher first took out a beaker and filled it with a solid the size of blue sand. Then he put half a glass of water in the beaker, mixed the water with the "blue sand" evenly, and the water turned blue slowly. At this time, the students' faces showed a look of surprise. Then the teacher added a kind of white translucent flake particles to the beaker. After a while, the blue water was no longer blue water. Keep asking, "What's going on?"

The science teacher saw that the students couldn't wait to know the reason and explained the principle. Blue sand is copper sulfate, and white transparent flake particles are sodium hydroxide. The chemical formula used for the reaction is CuSO4+2NaOH=Na2SO4+Cu(OH)2 (precipitation), that is, sodium hydroxide solution reacts with copper sulfate solution to generate copper hydroxide precipitation and sodium sulfate. We see that blue flocculent precipitate is formed and the color of blue solution becomes lighter.

Through this experiment, the students marveled at the magic of chemistry. The teacher said that chemistry is indispensable in our life, and chemistry is everywhere. This is also the first contact with magic chemistry, which is of far-reaching significance! I like it!

Chemistry Experiment Composition 9 Today's intellectual class is very interesting, because we did an experiment of acid-base indicator.

At first, the teacher showed us purple cabbage water, which was made by soaking purple cabbage in water for half an hour. The teacher took another bottle of soda water and threw the purple cabbage into the soda water. It turned green! I'm surprised. The teacher took another bag of white vinegar, and she threw the purple cabbage into the container of white vinegar. Wow! It is red! The whole process stunned us.

We begged to mix them all together, and finally, with the teacher's permission, we dropped soda water into red water and saw many bubbles, like coke. We asked, "Why?" The teacher replied, "Because there is carbon dioxide in it, people will see bubbles." . The teacher added: "There are anthocyanins in purple cabbage, which can be used as an acid-base indicator. Soda is alkaline, white vinegar is acidic, and when acid and alkali are mixed together, it becomes like that. "

I also learned a lot about acidic and alkaline foods in my life. The alkaline ones are mostly fruits and vegetables, and the acidic ones are mostly meat, desserts and fried foods. We'd better eat more alkaline food, but we should also eat together.

Through this lesson, I understand a lot of truth. For example, don't be picky about food, eat more alkaline food, and mix meat and vegetables ... Finally, I want to test you: Do you know what are acidic and alkaline things in life?

Chemistry experiment composition 10 "It's really hot recently. If only it snowed outside, it would be much cooler. " I looked at the rapidly rising temperature on the thermometer, kept fanning the wind, and my hands were tired and numb, but I kept sweating.

"Hey, what's this? Snow in June? Hey, maybe if I succeed, I will be cool. " Then my eyes caught a glimpse of a chemical experiment, which said it snowed in June.

"Ha ha, as long as the original absorbent resin and water! It's that simple. " It seems to cool down easily. "I'll try, take water-absorbent resin and pour it into pure water. It really turned into snow, but the color was a little monotonous. Since water can be turned into snow, colored water is colored snow. " I'm going to try my luck.

"Strange, strange, my food coloring, without him, how can I give my water color? It's really weird. I clearly put the food coloring in the drawer yesterday. How could it be gone? It's on the bed. " I looked everywhere and finally found some food coloring on the bed. I couldn't wait to open the irrigation mouth and drop a few drops into the water. I really made colorful snowflakes, but it didn't feel like real snowflakes at all. Alas, my colorful snowflake dream was broken.

"Xu Zhi, come out and tidy up here!" Dad looked at the table full of experimental data, pulled me out of the toilet and cleaned up the messy experimental data.

Alas, the snow didn't cool down and a lot of work was done. ...

Chemical experiment composition 1 1 Today is a hot day. My father took me to Northwest University to participate in the "Experimental Talent Activity" in Class 3, Grade 1. Today, we are going to do chemistry experiments in the laboratory of Northwest University, which is really exciting.

First of all, the experiment teacher asked us to line up and walk quietly. The students came to the laboratory quietly and saw some water in it. Orange, blue, green and white. Then we put on white lab clothes, blue lab gloves and transparent goggles, ready to do the experiment.

At first, the teacher told us how to make carbon dioxide and ice cream. The teacher spilled ice from the ice cream on the table and on the floor. It feels great. I hope we can do our own experiments in the future.

When it was time for us to do the experiment, the teacher said, "You can choose a team name yourself!" " "My name is: Lightning Team! Participating in my lightning team are: Feng Sirui, Wang Zhibo, Li,,.

We found a jar with white water, took some salt water and put it in the white water. Something magical happened, and the white water turned blue. I have never seen such a magical experiment. We also experienced 3D printing, as well as 3D movies and TV. It was the scene of the earthquake on the first floor of the school, which scared me at first!

It turns out that doing experiments is so interesting and magical that I am curious about chemistry experiments. I really want to come here next time to see other experimental processes.