Mark the letter A,B,C or D to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

3. A. driverless                     B. wonderland          C. favourite               D. expensive

4. A. festival                          B. disaster                C. pavement               D. station

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning

18. Every month, the volunteer group go to remote and mountainous areas to help those in need.

A.     Empty                               B. faraway                             C. crowded                D. poor

19. Women will be exhausted if they have to cover both jobs at work and at home.

A.     Very relaxed                   B. very pleased                     C. very tired              D. very happy

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning

20. Name some famous football players in the world.

      A. infamous                     B. unknown                            C. impossible           D. irregular

21. In my view, husbands should contribute to the household duties in order to reduce burden on their wives.

A.     Minimize                     B. lower                                 C. decrease               D. increase

Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response

22. The waiter:  “coffee or lemon juice”_- Mr Hung : “ ……………”________________

A.     I’ll have lemon juice, please                                    B. coffee is not expensive

C.     What did I ?                                             D, No, thank you

23.  “What did Mr Nam talk about?”_______________

A.     He has a good job                                          B. His parents are now in London

C.  His family.                                                       D. He has a big family

Mark the letter A,B,C or D to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

3. A. driverless                     B. wonderland          C. favourite               D. expensive

4. A. festival                          B. disaster                C. pavement               D. station

It means we must not go.

Trả lời :

It means we must not go.

~HT~

It took me three days to stay there.

ta có n_Al(OH)3(1)= 6,24/78= 0,08 (mol); n_NaOH(1)= 0,24*1= 0,24 (mol);

AlCl3 + 3NaOH --> Al(OH)3 + 3NaCl; (1)

0,08------0,24---------0,08

ta có NaOH hết.

Al(OH)3 + NaOH---> NaAlO2 + 2H2O; (2)

0,06----------0,06 (mol)

AlCl3 + 3NaOH --> Al(OH)3 + 3NaCl; (3)

0,013-----0,04 (mol)

ta có n_{Al(OH)3 sau pư}= 4,68/78= 0,06 (mol);

=> n_NaOH(2)= 0,06 (mol)

ta có n_{NaOH thêm vào}= 0,1*1=0,1 (mol)

=> n_NaOH(3)=0,1-0,06=0,04 (mol);

=> n_{AlCl3( trong X)}=0,08+ 0,013=0,093(mol);

C_{M (X)}= 0,093/0,1= 0,93 (M

a.

CnH2n+H2Ni,to⟶CnH2n+2CmH2m−2+2H2Ni,to⟶CmH2m+2{CnH2n:xCmH2m−2:y→{x+y=100x+2y=160→{x=40y=60→%mol=%V{40%60%CnH2n+H2⟶Ni,toCnH2n+2CmH2m−2+2H2⟶Ni,toCmH2m+2{CnH2n:xCmH2m−2:y→{x+y=100x+2y=160→{x=40y=60→%mol=%V{40%60%

b.

Khi cho NaOH dư vào thu thêm được kết tủa nên dung dịch có muối Ca(HCO3)2.

CO2 + Ca(OH)2 → CaCO3↓ + H2O

0,5       ←                    0,15

2CO2 + Ca(OH)2 → Ca(HCO3)2

Ca(HCO3)2 + 2NaOH → CaCO3↓ + Na2CO3 + 2H2O

0,1                   ←                    0,1

→ nCO2 = 0,1.2 + 0,5 = 0,7

Mặt khác: mdd giảm = mCaCO3 – mCO2 + mH2O

→ 9,12 = 50 – (44.0,7 + 18.nH2O) → nH2O = 0,56

Nếu dung dịch có tính acid, quỳ tím sẽ hóa đỏ, còn khi gặp dung dịch có tính bazo, quỳ tím hóa xanh.

Chuyển màu đỏ

Khó lắm bạn ạ

ko biết, em mới lớp 6

My name's Vy

I'm from VietNam

#Ninh Nguyễn

My name is Mai

I'm from Vietnam

Hok tốt

\(Zn+2HCl\rightarrow ZnCl_2+H_2\)   

0,5              1                                 0,5

\(n_{Zn}=\frac{m}{M}=\frac{32,5}{65}=0,5\left(mol\right)\)

\(V_{H_2}=n\cdot22,4=0,5\cdot22,4=11,2\left(l\right)\)   

500 ml = 0,5 l 

\(Cm_{HCl}=\frac{n}{V}=\frac{1}{0,5}=2\left(M\right)\)

1. Zn + 2HCl -> ZnCl₂ + H₂ 

2.Theo pthh ta có : n_Zn = m : M = 32,5 : 65 = 0,5(mol)

Có : n_H2 = n_Zn = 0,5(mol)

=> V_H2(đktc) là : n.22,4 = 0,5.22,4 = 11,2(l)