Thi ko giúp 

9. Na2O, Na2S, CO2, SO2, H2O, Na2CO3, NaHCO3, Na2SO3, NaHSO3, H2CO3, H2SO3, H2SO4 

10. CaC2, CaS, CaO, CO2, SO2, H2O, CaCO3, CaSO3, CaHCO3, CaHSO3, H2CO3, H2SO3, H2SO4 

Câu 9: 

Oxit

Na2O: natri oxit.

SO2: lưu huỳnh đioxit (khí sunfurơ)

SO3: lưu huỳnh trioxit

Axit

H2SO3: axit sunfurơ

H2SO4: axit sunfuric

Bazơ

NaOH: natri hiđroxit

Muối

NaHSO3: natri hiđrosunfit

NaHSO4: natri hiđrosunfat

Na2SO3: natri sunfit

Na2SO4: natri sunfat

Câu 10: 

Bài 11: 

b: Xét ΔADB vuông tại D có DE là đường cao

nên \(AE\cdot AB=AD^2\left(1\right)\)

Xét ΔADC vuông tại D có DF là đường cao

nên \(AF\cdot AC=AD^2\left(2\right)\)

Từ (1) và (2) suy ra \(AE\cdot AB=FA\cdot AC\)

2.      Emma’s mother air ticket wasn’t ordered.

3.      Have the Christmas cards been sent to her family?

4.      They haven’t been seen since last month.

5.      Several zoos have been built to protect animals and entertain people.

6.      How far is it from the Earth to the moon on the average?

7.      What can we send her on her birthday?

8.      Why do people install security camaras?

9.      When did you go to Nam’s birthday?

10.  How much sugar did she use to make a Squid Game cookie?

11.  If it didn’t rain all day, Hoang would join in the game.

12.  If Jack hadn’t answered well in the interview, the company wouldn’t have renewed the contract.

13.  If my mother hadn’t been so busy, she couldn’t have gone to the concert.

14.  If his sister spoke English, she would get the job.

câu 2 : đổ nước vào 3 lọ 
nhúng QT vào 3 lọ 
QT hóa đỏ => P2O5 
QT hóa xanh => CaO
QT ko đổi màu => NaCl 
câu 3 
\(a,3Fe+2O_2\rightarrow Fe_3O_4\\ Fe_3O_4+4H_2\rightarrow3Fe+4H_2O\\ 2H_2O\underrightarrow{\text{đ}p}2H_2+O_2\\ 4P+5O_2\rightarrow2P_2O_5\\b,S+O_2\underrightarrow{t^o}SO_2\\ 2SO_2+O_2\underrightarrow{t^o}2SO_3\\ SO_3+H_2O\rightarrow H_2SO_4\\ H_2SO_4+Zn\rightarrow ZnSO_4+H_2\\ 2H_2+O_2\underrightarrow{t^o}2H_2O\\ Na_2O+H_2O\rightarrow2NaOH\)  
câu 4 
\(a,2KClO_3\xrightarrow[t^o]{xtMnO_2}2KCl+3O_2\\ b,2Al+6HCl\rightarrow2AlCl_3+3H_2\\ c,Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\\ d,Zn+2HCl\rightarrow ZnCl_2+H_2\)

tách từng câu ra bn 

2 hard => as

3 life => from life

4 as => bỏ

5 the same => as

6 as => from

7 like => as

8 length => long

9 than => as

10 is => has

=20 nhé

10 + 10

= 10 x 2

= 20

Đáp số : 20

k mik nha

mik k lại

mik hứa với bn

10 + 10 = 20