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1. did you get good grade last semester , didn't you ?
2. is mr.mc guiness from ireland , isn't he ?
các câu còn lại là câu hỏi yes/no question bạn muốn trả lời là yes hay no cx đc
mn giúp mk với 
Có chút answer về bài bác đăng, sai xin đừng trách :)
Tờ 1 ko rõ
1. She said that she would get herself a drink.
2. If she knew anyone there, she would live in London.
3. If I had a spare ticket, I could take you to the concert.
4. I was given a wonderful present by Alice.
5. Our exercises are corrected at home by the teacher.
6. Several new schools are being built in our town.
7. John said that he wanted to attend a famous university.
Giúp mình nha !!! 
Bạn cho mình hỏi "trò chơi kéo co " được viết bằng tiếng anh như thế nào không ???
1. English is spoken all over the world
2. Nobody knows exactly when the Earth was created
3. When and where was Jack London born?
4. Prevention is said to be better than cure
5. The cake was divided into three equal parts by the teacher
6. What language is spoken in South America?
Câu 1.
Dùng dung dịch axit clohidric \(HCl\) vào hai chất trên:
+Thấy xuất hiện khí bay ra: kali cacbonat \(K_2CO_3\)
\(K_2CO_3+2HCl\rightarrow2KCl+H_2O+CO_2\uparrow\)
+Không hiện tượng: kali sunfat \(K_2SO_4\)
Câu 2.
a)\(Na_2O+H_2O\rightarrow2NaOH\)
b)\(Na_2O+H_2O\rightarrow2NaOH\)
\(6NaOH+Fe_2\left(SO_4\right)_3\rightarrow2Fe\left(OH\right)_3+3Na_2SO_4\)
Câu 3.
\(n_{NaOH}=\dfrac{20}{40}=0,5mol\)
\(n_{HNO_3}=\dfrac{20}{63}\approx0,3mol\)
\(NaOH+HNO_3\rightarrow NaNO_3+H_2O\)
0,5 0,3
\(\Rightarrow NaOHdư\) \(\Rightarrow\)Qùy hóa xanh.
Thank you very much