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I.   Read the following text carefully and choose the correct answer A, B, C or D for each of the gap.      When you are in Singapore, you can go about (1)__________ taxi, by bus, or by underground. I myself prefer the underground (2) __________ it is fast, easy and cheap. There are (3)__________ buses and taxis in Singapore and one cannot drive along the road (4) and without many stops, especially on Monday morning. The underground is therefore usually quicker (5)__________ taxis or...
Đọc tiếp

I.   Read the following text carefully and choose the correct answer A, B, C or D for each of the gap.

      When you are in Singapore, you can go about (1)__________ taxi, by bus, or by underground. I myself prefer the underground (2) __________ it is fast, easy and cheap. There are (3)__________ buses and taxis in Singapore and one cannot drive along the road (4) and without many stops, especially on Monday morning. The underground is therefore usually quicker (5)__________ taxis or buses. If you do not know Singapore very well, it is difficult (6)__________ the bus you want. You can take a taxi, but it is (7)__________    expensive than the underground or a bus. On the underground, you find good maps that (8)__________ you the names of the stations and show you (9)__________ to get to them, so (10)__________ it is easy to find your way.

1.   A. by                                B. in                            C. at                            D. on

2.   A. but                               B. because                 C. when                     D. so

3.   A. few                              B. a lot                       C. many                     D. some

4.   A. quick                           B. quickly                  C. quicker                 D. quickest

5.   A. so                                 B. like                        C. than                       D. as

6.   A. find                              B. to find                   C. finding                  D. found

7.   A. less                              B. more                      C. most                      D. much

8.   A. tell                               B. told                        C. tells                       D. telling

9.   A. who                             B. what                       C. when                     D. how

10. A. how                            B. that                        C. when                     D. where

Giúp mình với mai đi học phải nộp đề cương rồi

1
16 tháng 2 2021

1A ; 2B ; 3C ; 4B ; 5C ; 6B;7B ; 8A ; 9D ; 10B

17 tháng 2 2021

Nhiệt độ dung dịch sẽ giảm đi ! 

16 tháng 2 2021

Trạng thái rắn như: lưu huỳnh, cacbon, photpho,iot ...

16 tháng 2 2021
Lưu huỳnh, phốt pho
17 tháng 2 2021

đề thiếu chỗ : 100 ml dung dịch .... 0,1M và CuSO4 0,12M

bạn xem lại 

21 tháng 2 2021

dung dịch HCl nha, giải giùm t vs

I.   Complete the second sentences so that it has a similar meaning to the first.1.   I usually stayed up late to watch football matches last year, but now I don’t.→ I used.....................................................................................................................................2.   There were some trees in the field, but now there aren’t any.→ There...
Đọc tiếp

I.   Complete the second sentences so that it has a similar meaning to the first.

1.   I usually stayed up late to watch football matches last year, but now I don’t.

→ I used.....................................................................................................................................

2.   There were some trees in the field, but now there aren’t any.

→ There used............................................................................................................................

3.   Anna doesn’t live with her parents any more.

→ Anna used.............................................................................................................................

4.   He is not a poor man any more, but he become a rich businessman.

→ He used.................................................................................................................................

5.   They didn’t often go to the cinema every Sunday last year.

→ They didn’t use....................................................................................................................

6.   My hair now is much longer than that in the past.

→ In the past my hair used......................................................................................................

7.   I don’t have time to collect stamps as when I was in primary school.

→ I used.....................................................................................................................................

8.   Did you often go to the beach when you lived in Nha Trang?

→ Did you use...........................................................................................................................

9.   Mr. Hung often went to work by motorbike, but now he goes to work by bus.

→ Mr. Hung...............................................................................................................................

10. There were traffic jams in this street during rush hours, but now the street become wider.

→ There …………………………………………………………………….  

 

2
16 tháng 2 2021

1. I used to stay up late to watch football matches last year, but now I don't.

2. There used to be some trees in the fields, but now there aren't any.

3. Anna used to live with her parents.

4. He used to be a poor man, but he becomes a rich businessman.

5. They didn't use to go to the cinema every Sunday last year.

6. In the past my hair used to be much shorter than now.

7. I used to have time to collect stamps when I was in primary school.

8. Did you use to go to the beach when you lived in Nha Trang?

9. Mr Hung used to go to work by motorbike, but now he goes to work by bus.

10. There used to be traffic jams in this street during rush hours, but now the street becomes wider.

16 tháng 2 2021

vừa đủ thì dễ rồi

PTHH : \(CaS+2HBr-->CaBr_2+H_2S\uparrow\)

\(n_{H_2S}=\frac{0,672}{22,4}=0,03\left(mol\right)\)

Theo pthh : \(n_{CaS}=n_{H_2S}=0,03\left(mol\right)\)

                   \(n_{HBr}=2n_{H_2S}=0,06\left(mol\right)\)

                   \(n_{CaBr_2}=n_{H_2S}=0,03\left(mol\right)\)

\(\Rightarrow\hept{\begin{cases}m_{CaS}=0,03\cdot72=2,16\left(g\right)=m\\m_{ddHBr}=\frac{0,06\cdot81}{9,72}\cdot100=50\left(g\right)=m_1\end{cases}}\)

Theo ĐLBTKL :

\(m_{CaS}+m_{ddHBr}=m_{ddCaBr_2}+m_{H_2S}\)

=> \(2,16+50=m_{ddCaBr_2}+0,03\cdot34\)

=> \(m_{ddCaBr_2}=51,14\left(g\right)=m_2\)

=> \(C\%_{ddCaBr_2}=\frac{0,03\cdot200}{51,14}\cdot100\%\approx11,73\%\)

=> \(x\approx11,73\)

dễ nhưng vẫn nên check lại ...

16 tháng 2 2021

1. Sam, the girl with big blue eyes, is from Sweden.

2. Jungkook is good at running. He can run very fast.

3. Linh is adorable and friendly.

4. They are having a running race tomorrow morning.

5. In the afternoon, they are visiting Ba Vi dairy.

15 tháng 2 2021

PTHH

  2KMnO4 ---> K2MnO4 + MnO2 + O2

       a---------------0,5a----------0,5a---0,5a

     KClO3 --->  KCl + 3/2 O2

        b-------------b---------1,5b

   Theo pt ta có hpt

         0,5a + 1,5b = 0,2 

         142a + 74,5b = 21,65

   => a = 0,1 =>  m KMnO4 = 15,8 ( g 

         b = 0,1 => m KClO3 = 12,25 ( g ) 

  

11 tháng 2 2021

hydro+hydro=2 H

ko có p ứng ấy đâu 

Không có phản hứng bạn nhé, khi cộng hoá trị, chỉ có các electron vỏ ngoài liên kết, 2 hạt nhân không liên kết gì với nhau.