Cho mik hỏi: cho dung dịch natri cacbonat vào cốc nước vôi trong (dung dịch canxi hiđroxit) thấy có hiện tượng xảy ra là: A. Dung dịch không thay đổi màu sắc, trạng thái. B. Có chất rắn màu trắng từ từ lắng xuống đáy cốc C. Có chất rắn màu xanh từ từ lắng xuống đáy cốc D. Có chất rắn màu trắng và chất khí thoát ra ngoài.

Các câu hỏi liên quan

I) Complete the sentences with : There is , There are , there isn't , or There aren't 1)....................................five shops in the picture 2)....................................a bus at the bus stop 3)....................................any rivers near my house 4)....................................tow students in the classroom 5)....................................any trees next to her house 6)....................................a pen on the table II)Make questions: 1 Minh's father works in a hospital ........................................................................ 2 There are three bookstore near my house ........................................................................ 3 My parents work in a school ........................................................................ 4 I have on brother and tow sister ........................................................................ 5 My mother is cooking in the kitchen ........................................................................ 6 His father is working on a farm ........................................................................ 7 The boys are playing football in the park ........................................................................ 8 The go to school by bus ........................................................................ 9 You brother goes to the cinema every Saturday ........................................................................ 10 The supermarket closes at 9.00 ........................................................................ 11 Her mother cleans the house every day ........................................................................ 12 They go to beach every summer ........................................................................ 13 The children have three bikes ........................................................................ 14 My brother and Minh are playing soccer in the yard ........................................................................ 15 Mary buys new coats every winter ........................................................................ //làm giúp em nhé!