lỗi quá 

a) 

\(MnO_2+4HCl\underrightarrow{t^o}MnCl_2+Cl_2+2H_2O\)

\(2Fe+3Cl_2\underrightarrow{t^o}2FeCl_3\)

\(FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\)

\(2NaCl\left(r\right)+H_2SO_4đ\rightarrow Na_2SO_4+2HCl\)

\(CuO+2HCl\rightarrow CuCl_2+H_2O\)

\(CuCl_2+2AgNO_3\rightarrow2AgCl+Cu\left(NO_3\right)_2\)

b) \(2KMnO_4+16HClđ\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\)

\(Cl_2+H_2\underrightarrow{as}2HCl\)

\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)

\(FeCl_3+3AgNO_3\rightarrow3AgCl+Fe\left(NO_3\right)_3\)

\(2AgCl\underrightarrow{as}2Ag+Cl_2\)

\(Cl_2+2NaBr\rightarrow2NaCl+Br_2\)

\(Br_2+2NaI\rightarrow2NaBr+I_2\)

\(Zn+I_2\underrightarrow{t^o}ZnI_2\)

\(ZnI_2+2NaOH\rightarrow2NaI+Zn\left(OH\right)_2\)

c. \(MnO_2+4HCl\underrightarrow{t^o}MnCl_2+Cl_2+2H_2O\)

\(3Cl_2+6KOH\rightarrow3H_2O+5HCl+KClO_3\)

\(2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\)

\(2KCl\left(r\right)+H_2SO_4đ\underrightarrow{t^o}K_2SO_4+2HCl\)

\(MnO_2+4HCl\underrightarrow{t^o}MnCl_2+Cl_2+H_2O\)

\(Cl_2+Ca\left(OH\right)_2\rightarrow CaOCl_2+H_2O\)

e. \(2KMnO_4+16HClđ\rightarrow2KCl+2MnCl_2+5Cl_2+8H_2O\)

\(2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2\)

\(2KCl+2H_2O\underrightarrow{dpdd}2KOH+H_2+Cl_2\)

\(H_2+Cl_2\underrightarrow{t^o}2HCl\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

\(2FeCl_2+Cl_2\underrightarrow{t^o}2FeCl_3\)

\(FeCl_3+3NaOH\rightarrow3NaCl+Fe\left(OH\right)_3\)

khó quá ai giải đi

a) \(4P+5O_2\underrightarrow{t^o}P_2O_5\left(p\text{ư}hh\:\right)\\ P_2O_5+3H_2O->2H_3PO_4\left(puhh\right)\)
b) \(2KClO_3\underrightarrow{t^o}2KCl+3O_2\) 
   \(2Cu+O_2\underrightarrow{t^o}2CuO\) 
 \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\\ K_2O+H_2O->2KOH\) 
c) \(2Ca+O_2\underrightarrow{t^o}2CaO\)
   \(CaO+H_2O->Ca\left(OH\right)_2\)
   \(Ca\left(OH\right)_2+CO->CaCO_3+H_2\) 
câu 4 
 

em cần bài nào nhỉ

11. What are your plans for the weekend? (do)

® What are you going to do at the weekend?

12. It is a boring story.

® What a boring story!

13. These boys are very naughty.

® What naughty boys!

14. Tom drives is very careful

® How carefully Tom drives!

15. That is an interesting book

® What an interesting book!

8. There isn't any bookshelf in my bedroom

9. I like the living room best in my house

10. The book is under the notebook

11. I go to school by bike everyday

12. How often do you go to your English club?

8. I don’t have a bookshelf in my bedroom.

® There isn't a bookshelf in my bedroom.

9. My favorite room in the house is the living room.

 ® I like room in the house  is th living room

10. The notebook is on the book.

®The book is under the notebook

11. I cycle to school everyday.

® I  go to school with bike every day

12. How many times a week do you go to your English club?

® How often does you go to your English club

28. Let's take some photos.
29. My house has two family photos on the wall.
30. The computer is behind the cat.

28. Let's take some photos.

29. My house has two family photos.

30. The computer is behind the cat.

28. Let's take some photos.
29. My house has two family photos on the wall.
30. The computer is behind the cat.

18 The shopping centre is newer than the market

19 My cooking is better than the food here

20 My mobile phone is older than my computer

21 Vinh is shorter than Nam

22 Hong's bag is bigger than Hoa's bag

18. The market is older than the shopping centre.

® The shopping centre is newer than the market.

19. The food here is worse than my cooking

 ® My cooking is better than the food here.

20. My computer is newer than my mobile phone.

® My mobile phone is older than my computer.

21. Nam is taller than Vinh.

® Vinh is shorter than Nam.

22.  Hoa’s bag is smaller than Hong’s bag.

® Hong’s bag is bigger than Hoa's bag.

(1) 4 Na + O2 -to-> 2 Na2O

(2) Na2O + H2O -> 2 NaOH

(3) 3 NaOH + FeCl3 -> 3 NaCl + Fe(OH)3

(4) 2 Fe(OH)3 -to-> Fe2O3 + 3 H2O

(5) Fe2O3 + 3 CO -to-> 2 Fe + 3 CO2

(6) 2 Fe + 3 Cl2 -to-> 2 FeCl3

4Na + O2 -to-> 2Na2O 

Na2O + H2O => 2NaOH 

3NaOH + FeCl3 => 3NaCl + Fe(OH)3 

2Fe(OH)3 -to-> Fe2O3 + 3H2O 

Fe2O3 + 3H2 -to-> 2Fe + 3H2O 

Fe + 3/2Cl2 -to-> FeCl3