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31 tháng 5 2021

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. poor19. 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...
Đọc tiếp

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 like?                                             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

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31 tháng 5 2021

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

31 tháng 5 2021

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

30 tháng 5 2021

It means we must not go.

30 tháng 5 2021

Trả lời :

It means we must not go.

~HT~

30 tháng 5 2021

It took me three days to stay there.

30 tháng 5 2021
bn ơi đây là TA chứ không phải là hóa học nha!
30 tháng 5 2021

ta có nAl(OH)3(1)= 6,24/78= 0,08 (mol); nNaOH(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 nAl(OH)3 sau pư= 4,68/78= 0,06 (mol);

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

ta có nNaOH thêm vào= 0,1*1=0,1 (mol)

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

=> nAlCl3( trong X)=0,08+ 0,013=0,093(mol);

CM (X)= 0,093/0,1= 0,93 (M

30 tháng 5 2021

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

29 tháng 5 2021

Chuyển màu đỏ

29 tháng 5 2021

ko biết, em mới lớp 6

28 tháng 5 2021

My name's Vy

I'm from VietNam

#Ninh Nguyễn

28 tháng 5 2021

My name is Mai

I'm from Vietnam

Hok tốt

27 tháng 5 2021

\(Zn+2HCl\rightarrow ZnCl_2+H_2\)   

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 

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

27 tháng 5 2021

1. Zn + 2HCl -> ZnCl2 + H2 

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

Có : nH2 = nZn = 0,5(mol)

=> VH2(đktc) là : n.22,4 = 0,5.22,4 = 11,2(l)