HOC24
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Chủ đề / Chương
Bài học
\(Fe_3O_4+4CO\rightarrow3Fe+4CO_2\)
1. \(Fe_2O_3+3CO\) \(\rightarrow\) \(2Fe+3CO_2\) 2. \(2Al\left(OH\right)_3+3H_2SO_4\rightarrow AL_2\left(SO_4\right)_3+6H_2O\) 3. \(3K_2CO_3+2H_3PO_4\rightarrow2K_2PO_4+3H_2O+CO_2\) 4. \(3Ca\left(OH\right)_2+P_2O_5\rightarrow Ca_3\left(PO_4\right)_2+3H_2O\) 5. \(4FeS_2+11O_2\rightarrow2Fe_2O_3+8SO_2\) Câu 5 mình không chắc lắm nha bạn. Mà mình có 1 số lưu ý cho bạn nek
Người có công thành lập ra nước Vạn Xuân độc lập, tự chủ là
A. Lý Bí, Triệu Quang Phục
B. Triệu Việt Vương
C. Lý Phật Tử
D. Khúc Thừa Dụ
1. \(H_2SO_4\)+ NaOH --> \(Na_2SO_4\)+ \(H_2O\) \(H_2SO_4\)+ 2NaOH --> \(Na_2SO_4\)+\(H_2O\) \(H_2SO_4\)+ 2NaOH \(\rightarrow\) \(Na_2SO_4\)+2\(H_2O\) 2. \(H_2SO_4\)+ \(Mg\left(OH_2\right)\)--> \(MgSO_4\)+\(H_2O\) \(H_2SO_4\)+\(Mg\left(OH_2\right)\)\(\rightarrow\) \(MgSO_4\)+2\(H_2O\) 3. \(HNO_3\)+\(Zn\left(OH\right)_3\)-->\(Zn\left(NO_3\right)_2\)+\(H_2O\) 2\(HNO_3\)+\(Zn\left(OH\right)_3\)-->\(Zn\left(NO_3\right)_2\)+\(H_2O\) 2\(HNO_3\)+\(Zn\left(OH\right)_3\)\(\rightarrow\)\(Zn\left(NO_3\right)_2\)+2\(H_2O\)
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 11 to 20.All relationships go through difficult times. In the past, when married couples had problems they usually didn’t (11) _________. They had to either (12)_________ with each other or continue to live together in an unhappy relationship. Getting divorced wasn’t an option for most people due to economic and social reasons. Some people believe that this wasn’t such a bad thing. They say that relationships require hard work and (13)_________ . “If a relationship is going to last a lifetime, you have to keep working at it,” says Doreen, who is celebrating her fiftieth wedding anniversary this year. “It isn’t all roses and romance. (14)_________ perfect all of the time.
These days young people give up when there’s the (15)_________ argument.” Experts agree that communication is key. The most important thing is to (16) _________talking. How many times have you heard yourself say to (17)_________ , “If only you’d listen!” or “ I wish you (18)_________ do that!” The truth is, the (19)_________ couples talk, the better their relationship (20) _________be.Điền vào ô 16
A. raise
B. control
C. stop
D. keep
Bộ phận thực hiện trong cơ chế duy trì cân bằng nội môi là:
A. Thụ thể hoặc cơ quan thụ cảm.
B. Trung ương thần kinh.
C. Tuyến nội tiết.
D. Các cơ quan dinh dưỡng như: thận, gan, tim, mạch máu…