Bài 1*: Có ba mẫu phân bón hoá học không ghi nhãn là : phân kali KCl, phân đạm NH4NO3 và phân lân Ca(H2PO4)2. Hãy nhận biết mỗi mẫu phân bón trên bằng phương pháp hoá học và viết các phương trình hoá học.

Bài 6: Hoàn thành các phương trình hóa học sau (nếu có):

(a) NaCl + AgNO3.

(b) KCl + HNO3.

(c) Fe + CuCl2.

(d) BaCl2 + H2SO4.

(e) Mg(OH)2 + Na2CO3.

(g) BaCO3 + HCl.

(h) CaSO3 + H2SO4.

(i) FeCl2 + Ba(OH)2.

(k) Na + FeCl2

(l) Zn + FeCl3

(l) Cu + AgCl

(m) Zn + Mg(NO3)2

Bài 2: Có những muối sau : CaCO3, CuSO4, MgCl2 Hãy cho biết muối nào có thể điều chế bằng phương pháp sau : a) Axit tác dụng với bazơ. b) Axit tác dụng với kim loại. c) Muối tác dụng với muối. d) Oxit bazơ tác dụng với oxit axit. Viết các phương trình hocj

hepl me!!

Bài 1: Nếu chỉ dùng dung dịch NaOH thì có thể phân biệt được hai muối trong mỗi cặp chất sau được không ?

a) Dung dịch Na2SO4 và dung dịch Fe2(SO4)3.

b) Dung dịch Na2SO4 và dung dịch CuSO4.

c) Dung dịch Na2SO4 và dung dịch BaCl2.

Giải thích và viết phương trình hoá học.

Giups em voiws aj!!!

Bài 3. Cho 35,5 gam hỗn hợp Zn, Cu vào 500g dd HCl vừa đủ . Sau khi phản ứng kết thúc thu được 6,72 lít khí H2 (đktc) a , Viết PTHH xảy ra? b , Xác định phần trăm khối lượng mỗi kim loại trong hỗn hợp ban đầu? c, Tính nồng độ phần trăm của dung dịch HCl đã dùng ? d, Tính nồng độ phần trăm của chất trong dung dịch thu được sau phản ứng ?

37.You must clean this machine before it is used.

  A. This machine is cleaned before it is used.

  B.This machine will be cleaned before it is used.

  C.This machine is being cleaned before it is used.

  D.this machine must be cleaned before it is used.

38.People believe that he has special knowledge which may be useful to the police.

  A.He is believed to have special knowledge which may be useful to the police.

  B.He was believed to have special knowledge which may be useful to the police.

  C.He has special knowledge which may be useful to the police.

  D.He has special knowledge which may be useful to the police is believed.

39. People don’t use this road very often.

  A.This road is not used very often.

  B.Not very often this road is not used.

  C.This road very often is not used.

  D.This road not very often is used.

40. “ Where should I go for the next holiday?” Linh said

  A.Linh asked me where she should go for the next holiday?

  B.Linh had no idea where to go for the next holiday.

  C.Linh advised me to go somewhere for the next holiday.

  D.I asked Linh where I should go for the next holiday?

IX.CLOSEST SENTENCES:

33.He / very tired / because he / not sleep / well.

  A.He is very tired because he wasn’t slept well.

  B.He was very tired because he hadn’t slept well.

  C.He has been very tired because he wasn’t sleeping well.

  D.he is very tired because he has slept well.

34.Most of the people recovered quickly. They were injured in the crash.

  A.Most of the people who recovered quickly were injured in the crash.

  B.The people who were injured in the crash, most of them recovered quickly.

  C.Most of the people recovered quickly after the crash.

  D.Most of the people who were injured in the crash recovered quickly.

35.My sister didn’t leave the car key, so I couldn’t pick her up at the airport.

  A.If my sister had left the car key, I could pick her up at the airport.

  B.If my sister had left the car key, I would have picked her up the airport.

  C.If my sister has left the car key, I would have picked her up at the airport.

  D.if my sister left the car key, I would pick her up at the airport.

36.She worked for a national bank and then she applied for a new job.

  A.Before applying for a new job, she had worked for a national bank.

  B.She worked for a national bank before she had applied for a new job.

  C.She had worked for a national bank after she applied for a new job.

  D.She worked for a national bank although she applied a new job.