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Minh thư
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nguyễn minh lâm
7 tháng 7 2023 lúc 20:28

1  every night 

2 often

3 at present

4 on mondays

5 every night

6 always

7 at this time

8 often

hello
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Thư Phan
26 tháng 1 2022 lúc 14:27

<Lần sau em nên tách nhỏ ra nhé>

Bài 1: Cho dạng đúng của động từ trong ngoặc.

1. Look! The car (go)………is going………………. so fast.

2. Listen! Someone (cry) ………is crying……….in the next room.

3. Is your brother (sit)……sitting……. next to the beautiful girl over there at present?

4. Now they (try)………are trying……. to pass the examination.

5. It’s 12 o’clock, and my parents (cook) ………are cooking……lunch in the kitchen.

6. Keep silent! You (talk) ………are talking……so loudly.

7. I (not stay)………am not staying………. at home at the moment.

8. Now she (lie)………is lying……. to her mother about her bad marks.

9. At present they (travel)………are travelling……….. to New York.

10. He (not work) ……isn't working……in his office now

/baeemxinhnhumotthientha...
26 tháng 1 2022 lúc 14:26

cop nguyên hết hả bn ?

Nguyễn acc 2
26 tháng 1 2022 lúc 14:26

bn đăng từng bài 1 thôi nha;-;

Mai Ngô
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Tạ Kim Bảo Hoàng
22 tháng 3 2017 lúc 21:26

Một bên để quả cân 1 kg sau đó đổ gạo vào 2 bên cân cho đến khi cân thăng bằng lúc đó ở mỗi bên có khối lượng là 3kg và bên để quả cân sẽ có khối lượng gạo là 2 kg

                                        

Mai Ngô
25 tháng 3 2017 lúc 16:18

Cảm ơn nhìu

Shuriana
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Sunn
12 tháng 7 2023 lúc 8:59

* Exercise. Fill in each space with a correct preposition

1. Nam is never late..for.....school.

2. They are waiting..for. Marry ..at..the bus stop at the moment

3. We often study English..on...Monday, Tuesday and Saturday.

4. She built this house ..in. 1998

5. My father often goes to work .at..7 o'clock

6. He will come .between...6.30 and 7.00

7. Mo will stay with us..from..Monday to Friday

8. He arrived..in..Singapore..on.....Monday evening.

9. Goodbye! See you..on...Sunday

10. The bus collected us .at..5 o'clook early..in.the morning

11. We usually go to our home village at least once.in..the summer

12. They planned to have a trip.in..June

13. She loves to watch the stars.at..night

14.Nam never travels to work ..by.....car

16. I am very proud ....of...our school

15. My mother went to work..on.foot last Sunday

17. She is fond..of....watching T.V

18. He is afraid.of..living alone in a big city

19. Mo is angry..at.me because I am angry..with...her dog

 20. Son is interested..in....reading novel

21. Ha Noi is famous ...for.... its beauty and its people

23. Nam is fed up.....with...doing the same things everyday

22. How...about..watching T.V at my home this evenng?

24. She is bored.with....eating the same thing everyday.

25. It is not convenient..for.you to call someone at night.

26. Milk is very good..for..our health

27. Ha Noi is very different..from..Paris

28. The hall is full..of.students waiting.for...their teacher.

29. He is always short.of..money.

30. They are worried...about...missing the train.

31. They left the restaurant..without..paying the bill.

32. ..in..National day, people usually walk in large groups.

33. I am surprised..at.his success

34. Thank you very much...fot...lending me your money.

35. Alexander Graham was born.in...Edinburgh .in...March, 1847

36. You should turn..off... all the lights before going out.

37. He has to stay at...home to look..after..his baby because his mother went out

38. She is looking .for..her lost pen.

39. I will see you...off...at the airport tomorrow.

40. If you don't pay the electricity bill,the electricity will be cut..off...

41. My mother often buys presents...for.me on my birthday

42. We have to put .on...our shoes before going in the pagoda.

43. My shoe is very old. It was worn out

44. My father usually helps me ...with..my homework.

45. I got up late because my arlam clock didn't go..off....

46. This table was made..of..wood

47. Don't look .at..me

48. Mo is very good...at...English

49. My car is still...in..good condition

50. He is always.on..time.

Võ Thế Thắng
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tthơ
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Chanh Xanh
1 tháng 12 2021 lúc 14:24

   A.  Bảng dữ liệu 

๖ۣۜHả๖ۣۜI
1 tháng 12 2021 lúc 14:24

C

Đinh Trung Hiếu
3 tháng 12 2021 lúc 15:43

c

Nguyễn Thảo My
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hnamyuh
13 tháng 5 2021 lúc 19:51

a)

$P_2O_5 + 3H_2O \to 2H_3PO_4$

$3NaOH + H_3PO_4 \to Na_3PO_4 + 3H_2O$
$2NaOH + H_3PO_4 \to Na_2HPO_4 + 2H_2O$
$NaOH + H_3PO_4 \to NaH_2PO_4 + H_2O$

b)

n P2O5 = x/142

=> n H3PO4 = 2n P2O5 = x/71(mol)

n NaOH = 125.16%/40 = 0,5(mol)

Để thu được hai muối Na2HPO4 , NaH2PO4 thì :

1 < n NaOH / n H3PO4 < 2

<=> 1 < 0,5 / (x / 71) < 2

<=> 1 < 35,5/x < 2

<=> x < 35,5 < 2x

<=> 17,75 < x < 35,5

c)

Để nồng độ phần trăm hai muối bằng nhau thì

m Na2HPO4 = m NaH2PO4 = y(gam)

=> n NaOH = 2n Na2HPO4 + n NaH2PO4 = 2y/142 + y/120 = 0,5

=> y = 22,3

Ta có :

n H3PO4 = n Na2HPO4 + n NaH2PO4 = y/142 + y/120 = x/71

=> x = 24,344(gam)

 

Cô Nàng 2k
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Kiều Đông Du
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Đỗ Khánh Chi
6 tháng 9 2018 lúc 13:45

Chọn D

Loài sinh vật này có thể sống ở môi trường D