Last Monday, the fifth-grade students of the whole school took advantage of the team class and the big break to attend a lecture. I am both excited and curious. With the team, our class came to the stepped classroom on the fifth floor, where there were already several teachers. It seems that we have been waiting for our classmates for a long time. When I got to my seat, I was pleasantly surprised to find a "gift bag" wrapped in a bag on the armrest of the seat, which contained a thin book, a bottle of mineral water from Nongfu Spring, a plastic cup and test paper. After all the students entered the venue, the lecture film officially began.
Ah, it's the staff of Nongfu Spring who came to attend the class! I was surprised to hear the teacher introduce himself on the stage. The theme of the lecture is closely related to our life-water. The teacher, the staff of Nongfu Spring, said that the lecture was divided into three parts and there was an interactive session. If you answer this question correctly, you can get a small prize. I heard that there was a prize, and my eyes lit up. The teacher went on to say that the plastic cups, mineral water and test paper in the "big gift package" can be used for our own experiments in the future. "How nice!" I thought to myself. Water is vital to life, and March 22nd every year is the International Day of Water Remembrance. According to the survey, an adult living in Beijing should drink at least 2200 ml of water every day; You shouldn't wait until you are thirsty and can't even salivate in your mouth before gulping water; Eight glasses of water a day, one for half an hour in the morning, one after getting up in the morning, one for half an hour before going to bed at night, one after school, one after school and one before lunch, so that eight glasses of water are finished; More than 65% of the human body is composed of water; Besides, there are other ways to judge whether the water sold in the store is qualified by looking at the label ... these are all what I learned in the lecture! There is also a prize quiz in the middle. I raise my hand every time, but because I don't raise my hand fast enough, I miss the prize-a small mirror.
Next, it is the experimental link I have been waiting for for a long time! The teacher prepared many bottles of different brands of mineral water, poured the water into plastic cups, and then put the test paper into the water. After mixing evenly, the color of water turns green, and a little water turns yellow. I am as curious as other students: why can a small piece of paper change the color of water? There was a sigh on the seat, and the teacher explained, "Look, why does the water change color?" Put the ph test paper into the water. If the water is green, it is weakly alkaline. If it is yellow, water is weak acid. "Oh, I finally know why that" magic "note can change the color of water like a chameleon, and I also know that the note is not ordinary paper. Like people, it has a "name": ph test paper.
I can't wait to do this experiment with the materials in the "spree". The water is green, very clear, transparent and beautiful! After the lecture, I was glad to go back to the classroom. I know so much about water, how to drink water healthily in daily life, and there is something called ph test paper to test the pH of water ... After I go home, I will share what I have learned today with all my friends and parents around me, and even tell my grandparents, grandparents and the elderly to replenish more water.
Water is closely related to our life and is an indispensable member of life. I also want to appeal to all people living on the earth: "Please cherish the water resources around you and don't waste precious water resources. Meanwhile, please drink more water. Let the body be healthy! "