My name is Tina, and I am a first grader in Chiayi Girl's Senior high school. I was a teacher in the activities last summer. When I received the invitation to teach again this winter, the feeling of absolute accomplishment and jubilation from last summer pushed me forward, and I decided to join the teaching process again this summer, it is going to be a fabulous experience for both the volunteers and the children participating.
材料:葡萄汁、小蘇打粉、水、棉花棒、紙
原理:葡萄汁為酸性,小蘇打粉為鹼性,兩者會發生酸鹼中和反應,造成紙張變色。
步驟:
1.將小蘇打粉和水混合
2.用棉花棒沾小蘇打水在紙上寫下訊息
3.等紙張乾燥後,在上面塗一層葡萄汁,就可以看到隱藏的訊息囉!
小試身手:
Q1. 今天使用的小蘇打水是什麼性的?
A.酸性 B.鹼性
Q2.今天塗在小蘇打水上的葡萄汁是什麼性的?
A.酸性 B.鹼性
Q3. 你發現塗完葡萄汁的字是什麼顏色呢?
A. 紅色 B.綠色 C.藍色
今天的心得或收穫~
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