? I saw a video where someone was experimenting with a rainbow waterfall, and the effect was very spectacular. After reading the operation steps, I couldn't wait to try it.
? First, I prepared the following materials: rainbow candies, disposable plastic plates and water. The experiment begins.
? The first step is to put the rainbow candies in a disposable plastic plate. And arrange them in a circle in the order of red, orange, yellow, green, blue and purple. The second step is to add an appropriate amount of water into the disposable plastic cup. Third step, leave it there for ten minutes. One minute, two minutes, three minutes... I suppressed my excitement and waited quietly. When it was almost ten minutes, I called my parents to observe the experimental results. The whole family looked at the disposable plastic plate: “Wow, it worked! ”, I shouted enthusiastically. Mom and Dad said in unison: “Congratulations! »
? After the experiment was over, I thought: why can Skittles summon a rainbow waterfall when added to water. My mother seemed to see into my mind and said: "The principle of this experiment is actually that after the rainbow candy comes into contact with water, the edible pigments contained in it dissolve into water, so you can see the rainbow waterfall.
? This experience opened my eyes. As long as we observe carefully in life, we will discover many scientific mysteries!
Fruits are essential elements in our lives. There are many types of fruits, such as apples, bananas, pears, grapes... They are all rich in nutrients. However, they also have a particular purpose: to produce electricity.
This morning, I was worried about my thesis. Watching time pass second by second, I still feel emotionless and scratch my head and ears anxiously. When my mother saw me in such a hurry, she brought me some fruit to eat. Looking at these fruits, my eyes suddenly lit up. I remembered an electricity-generating fruit experiment mentioned in the science book. I was delighted and quickly prepared the experimental supplies.
I brought three lemons (maybe other fruits), a fruit knife, a small light bulb and some wires connected to copper and zinc sheets.
First, turn all the lemons over and squeeze them, turning them until they are soft. This will allow all the juice from the lemon pulp to come out and make the lemon bulbs work better.
Secondly, use a fruit knife to cut two small slits 1 cm longon 1/3 of one side of each lemon, put the copper foil and the zinc foil there respectively, and put one of the copper pieces of the lemon is connected to the zinc piece of the other lemon, but the ends are not connected. Finally, connect both ends of the wires to the positive and negative terminals of the bulb.
"Yeah, yeah, my light is on!" I saw the little light bulb lit and I couldn't help but applaud. The “Fruit Bulb” experiment was a success!
But why do fruits produce electricity? After searching for information, I realized: lemons do not produce electricity. The reason they produce electricity is because two metals are in acidic solution. The galvanic cell effect! It turns out that lemon is a juicy fruit rich in citric acid. If we insert at the two ends of the lemon two metallic conductors with very different activities, such as silver-iron, the cudrunk-iron, aluminum-iron or zinc. etc., when the two ends of the conductor are connected to form a loop, the electrolytic reaction of the two metals in the acid solution will generate current in the circuit, which is its galvanic cell reaction. Not only lemons, but also fruits with fruit acid, amylase and pH.
Oh that's it, it looks like fruit can also be used instead of batteries! After this experience, I understood many scientific principles, and I also learned that the scientific field is vast.