An interesting experiment essay 450 words essay for fourth grade elementary school

In study, work, and life, everyone is most familiar with composition, which requires a complete structure of the chapter, and must avoid the appearance of unending composition. What kind of essays have you seen? The following is a 400-word essay on an interesting little experiment that I have collected, welcome to read, I hope you can enjoy it.

God, I did a fun little experiment called "Flying Rocket". I prepared a plastic bottle with a stopper, a bottle of white vinegar, a bag of baking soda, a few sheets of colored paper, a pair of scissors, and double-sided tape.

Everything was ready, and the experiment began. I first used scissors to cut the colored paper into the shape of a rocket, glued it to a plastic bottle, and made a very beautiful little rocket. Next, I slowly poured a quarter of the white vinegar into the bottle.

Then put the one wrapped in baking soda. Stuff the paper towel into the bottle, quickly close the rubber stopper, and place the bottle face down on the ground steadily. After these steps, I quickly stood aside, my heart pounding, staring intently at the bottle.

At this time, I noticed that the paper towel in the bottle was slowly loosened, and the baking soda and white vinegar slowly fused and began to have a chemical reaction. A large amount of white foam is produced in the bottle, and in an instant, the bottle is filled. Suddenly, with a "bang", the "rocket" flew up.

Fly, 'rocket' fly! I cried out with joy.

Why do rockets fly? I've been thinking about it for a long time and still don't have an answer. Later, my father told me that this was because the acetic acid in white vinegar and sodium bicarbonate in baking soda fused to produce a large amount of carbon dioxide gas, and the air pressure in the closed bottle increased instantly, so the "rocket" flew up.

This little experiment was so interesting, it made me increase my knowledge, develop a strong interest in chemistry, and gain happiness.

Today, I decided to do an interesting experiment called "Paper Cups That Don't Burn". Materials are indispensable for the experiment, and the materials needed for this experiment are: two paper cups, candles, a lighter, and water.

The experiment began, I first picked up a paper cup, then lit a candle with a lighter, and put it under the paper cup, the little flame was like a naughty child, dancing happily on the paper cup, and after a while, the original complete paper cup was gone, leaving only a few fragments.

Isn't it a paper cup that can't be burned? Why did it burn out all at once?My sister asked, confused.

I smiled and said, "This is to prove that ordinary paper cups can burn out." Then I took another paper cup, poured a little water, and finally put it on the lit candle, and then we just waited patiently, and after five minutes, the bottom of the cup began to blacken, but the paper cup did not burn, and after another five minutes, the walls of the cup began to blacken, but the paper cup still did not burn.

My sister was stunned and asked, "What the hell is going on?""I'm serious :

This is the principle of heat transfer, the paper cup absorbs the heat of the fire and transfers the heat to the water, so the paper cup does not burn. When my sister heard this, she looked like she didn't understand, which made me laugh.

This experiment not only exercised my hands-on ability, but also learned a lot of scientific knowledge, which is really the best of both worlds.

Whether you are in school or in society, you often see the figure of composition, which is the transition from internal speech to external speech, that is, from a compressed and concise language that you can understand to an external language form that has a standardized grammatical structure and can be understood by others. In order to make it easier and more convenient for you to write an essay, the following is an interesting experimental essay of 400 words that I have compiled for you, for reference only, I hope it can help you.

In life, a careful observation, an inconspicuous action, or even a chance discovery can make you know a little more. And I've passed a very interesting experiment and gained a lot of knowledge, so let's talk about the experiment I did!

Last summer, I was reading a composition book with relish, and suddenly a diary entry caught me, saying that tea can turn into ink. I'm skeptical, how can tea turn into ink?However, on the books'Things don't lie!

So, I went to ask my father, who didn't know if it was true or not, so he casually said to me, "Wouldn't you just go and verify it yourself?""That's the only way to do it now, so I'm going to practice it myself in order to satisfy my strong curiosity!

I will do what the book says, make a cup of tea first, and then put the rusty iron needle in it when the tea turns earthy yellow. Then, just wait a few more hours. In this way, I waited with great anticipation for the results of the experiment.

In the evening, I leaned over to the kitchen table and said, "Wow!."It's really inky next to it!I couldn't help but exclaim.

It was incredible, I hurriedly ran to the stupid oak table and got a brush, dipped it in it and began to write. Suddenly, black letters came into my eyes. It's really godly, it's exactly the same as the effect of ink!

However, how can there be such a big change in the rusty iron needle when it is put into the tea?If you want to find out why this experiment is, you have to ask!I checked the information and found out that tea contains a substance called tannin acid, which will react chemically when it encounters rusty iron, so the tea will turn black.

See, only through experiments can you verify your conjectures, and only through experiments can you deepen your impressions. How many successful people have the joy of success because of their curiosity and perseverance, this kind of interesting experiment not only made me more curious about the magical world, but also gained a lot of knowledge from it.