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YS
16 tháng 12 2019
I dream of a neighborhood where it is safe and full of big green trees. A neighborhood where kids are safe to run around. My dreamed neighborhood would have houses with only one or two levels so everyone can enjoy the beautiful sunrise and sunset. The tall buildings narrow our view of the vast blue sky. Each house in the neighborhood should have a big front and back lawn. Everyone should take a good care of their lawn to make the neighborhood looks nice. All of the houses in the neighborhood should have central air so that when the weather is too hot to bear, you can use the air conditioning. When it's freezing cold out, you can use the heater to warm the house up. There should be a school and a park nearby so that the kids can walk to fun places. These are the characteriss of my dreamed neighborhood.
TP
0
12 tháng 3 2022
Cho thử quỳ tím:
- Chuyển đỏ -> HCl
- Không đổi màu -> Na2SO4, NaHSO4, NaCl (1)
Cho các chất (1) tác dụng với BaCl2 và nhúng quỳ tím:
- Xuất hiện kết tủa trắng và không làm quỳ tím đổi màu -> Na2SO4
Na2SO4 + BaCl2 -> 2NaCl + BaSO4
- Xuất hiện kết tủa trắng và làm quỳ tím chuyển đỏ
2NaHSO4 + BaCl2 -> BaSO4 + Na2SO4 + 2HCl
- Không hiện tượng -> NaCl
YS
16 tháng 12 2019
I dream of a neighborhood where it is safe and full of big green trees. A neighborhood where kids are safe to run around. My dreamed neighborhood would have houses with only one or two levels so everyone can enjoy the beautiful sunrise and sunset. The tall buildings narrow our view of the vast blue sky. Each house in the neighborhood should have a big front and back lawn. Everyone should take a good care of their lawn to make the neighborhood looks nice. All of the houses in the neighborhood should have central air so that when the weather is too hot to bear, you can use the air conditioning. When it's freezing cold out, you can use the heater to warm the house up. There should be a school and a park nearby so that the kids can walk to fun places. These are the characteriss of my dreamed neighborhood.
5 tháng 5 2023
- Trích mẫu thử.
- Nhỏ vài giọt từng mẫu thử vào giấy quỳ tím.
+ Quỳ hóa đỏ: axit axetic
+ Quỳ không đổi màu: rượu etylic
- Dán nhãn.
NS
0
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