1.
2Na+2H2O→2NaOH+H2
SO3+H2O→H2SO4
Na2O+H2O→2NaOH
N2O5+H2O→2HNO3
⇒4 chất
2.
Theo định luật bảo toàn khối lượng
mhh+mH2=mH2O+mFe
nH2O=1,62/18=0,09mol
nH2=nH2O=0,09mol
→6,76+0,09.2=1,62+mFe
→mFe=5,32g
bài 2
I ......(be) sick everytime i eat that kind of my teacher....(teach) in that school 5 years ago my father...(come) when I.........(play) a game online he..(read) a newspaper when his wife......... (watch) Tv he ....(talk) when the teacher..........(explain) a difficult question
Nhìn vậy chứ dễ lắm🥲 mà mình khong có động lực để làm. Giúp mình nha...
Một que kem ốc quế gồm hai phần: phần kem có dạng hình cầu, phần ốc quế có dạng hình nón.. Biết hình cầu và hình nón có cùng bán kính 2,5cm, chiều cao hình nón gấp ba lần bán kính hình cầu. Tính thể tích của que kem? (Lấy pi = 3,14 và kết quả làm tròn đến hàng đơn vị) giúp em câu này với , em cảm ơn
4. Choose the best answer to rewrite each of the following sentences. 1. "She is so selfish," he said. A. He said she was so selfish. B. He said she had been so selfish. C. He said she will be so selfish D. She said she had been being so selfish 2. She said: "I’m getting better". A. She said she was better. B. She said she was getting better. C. She said she had been better. D. She said she is getting better. 3. "I can do that for you,’ he said. A. He said he could do that for me. B. He said I will be able to do that for me. C. He said he could have done that D. He said he had been able to do that for me. 4. "There is no milk in the fridge" she said. A. She said there had been no milk in the bridge. B. She said was there no milk in the bridge. C. She said there was no milk in the fridge. D. She said there will be no milk in the fridge. 5. "I have seen John lately" he told me. A. He told me he had seen John lately. B. He told me he had I seen John lately. C. He told me he saw John lately. D. He told me he will see John lately. 6. "He won’t come back", she said. A. She said he wouldn’t come back. B. She said he came back. C. She said he would come back. D. She said he will come back. 7. Tve been waiting for you for two hours,’ she said. A. She said she had waited for me for two hours. B. She said she had been waiting for me for two hours. C. She said she was waiting for me two hours. D. She said she has waited for me for two hours. 8. "I know her well", she said. A. She said she knows her well. B. She said she knew her well. C. She said she will know her well. D. She said she had known her well. 9. "I am going to get married", she claimed. A. She claimed she was going to get married. B. She claimed she is going to get married. C. She claimed she will get married. D. She claimed she had been going to get married. 10. He said, "He is a liar". A. He said he was a liar. B. She said he is a liar. C. He said he will be a liar. D. She said he was being a liar.
giúp mik vs ạ mik cảm ơn ( mn ko cần giải thích đâu ạ vì mik đang cần gấp )
tìm y 15y - 133=17 14y+54=82 17y-20=14 nhanh nha
Mn cho e hỏi ở kì trung gian ADN nhân đôi trước hay tổng hợp ARN xảy ra trước vậy
25. Our students ______to use smart phones at school. A. are not allowed B. allow C. allowed D. have allowed 26. I’m tired ______ walking a long journey. A. of B. in C. on D. at * 35. “Have you ever been to Ha Noi?” – “Yes, I ___________ there last summer.” A. have been B. has been C. were D. was *
Hãy giải thích câu nói của đại thi hào Goethe: "Dù vua chúa hay dân cày, kẻ nào tìm thấy sự bình an trong gia đình, kẻ ấy là người sung sướng nhất" giúp mk vs mk vote 5* cho
Mình sẽ vote cho bất kỳ ai trl ạ
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