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11 tháng 11 2018

1. Hand-written homework.
=> It can prevent students from copying the answer from Internet but it is also inconvenient and time-consuming. Especially, students that have bad hand-writing can get bad mark just because teacher cannot understand what they wrote. Therefore, I don't want to preserve it. 

2. Playing traditional games hide and seek, elas-band jumping, skipping and catch the chickens.
=> I want to preserve it because it's also a good physical activity for children that helps them to be healthier and shape.
3. Obeying your parents/teachers without talking back.
=> I don't want it to be preserved. Sometimes, children should be allowed to speak up, to give their opinions so that parents can understand their children more.

11 tháng 11 2018

Cảm ơn bạn nhé

1 tháng 1 2021

a) PTHH : Fe + H2SO4 -----> FeSO4 + H2 ( Vì Cu là kim loại yếu không tác dụng được với axit loãng nên bài này chỉ có 1 PT )

\(nH_2=\frac{4,48}{22,4}=0,2\left(mol\right)\)

Theo PT : \(n_{Fe}=n_{H_2}=0,2\left(mol\right)\)

\(\Rightarrow m_{Fe}=n.M=0,2\times56=11,2\left(g\right)\)

\(\%m_{Fe}=\frac{11,2}{30}\times100=37,3\%\)

\(\%m_{Cu}=100-37,3=62,7\%\)

b) Đổi 150ml = 0,15 l

Theo PT : \(n_{H_2SO_4}=n_{H_2}=0,2\left(mol\right)\)

\(\Rightarrow C_M=\frac{n}{V}=\frac{0,2}{0,15}\approx1,4\left(M\right)\)

23 tháng 9 2021

Là môn văn nha, mình ấn lộn:))

23 tháng 9 2021

Chăm sóc bảo vệ trẻ em là một trong những vấn đề cấp bách. Chăm sóc trẻ em được tiến hành trên cả 2 mặt: Vật chất và tinh thần. Gia đình với khả năng cao nhất của mình cung cấp cho trẻ em những điều kiện tốt nhất để phát triển về thể chất. Trong điều kiện hiện nay, kinh tế gia đình về cơ bản đã được nâng lên với mức ổn định. Vì vậy các bậc cha mẹ cần dành cho trẻ không chỉ về điều kiện vật chất mà cần chú trọng chăm sóc về mặt trí tuệ. Trẻ em không phân biệt trai hay gái được tạo điều kiện học tập phát triển theo khả năng của mình. Để tạo môi trường chăm sóc thuận lợi, cha mẹ cần tạo một bầu không khí yêu thương, đoàn kết, gắn bó quan tâm giữa các thành viên gia đình, cho dù cuộc sống còn nhiều vất vả, nhưng khi có trẻ em trong gia đình thì các thành viên phải cố gắng bỏ qua những mâu thuẫn, xích mích để cho trẻ em luôn luôn có cảm tưởng rằng ngôi nhà của mình chính là tổ ấm. Với những trẻ em có thiên hướng xuất hiện một số năng khiếu, cha mẹ phải biết phát hiện, khuyến khích tạo mọi điều kiện để ươm mầm tài năng. Việc chăm sóc phát triển trí tuệ cho trẻ em có quan hệ chặt chẽ với việc giáo dục, xã hội hoá trẻ em. Quan điểm giáo dục hiện nay coi gia đình là một trong ba môi trường giáo dục trẻ em quan trọng. Gia đình là trường học đầu tiên và suốt đời của mỗi con người. Bởi gia đình có trách nhiệm thực hiện chức năng giáo dục thông qua 3 giai đoạn phát triển của trẻ em: từ 1-3 tuổi, từ 3-6 tuổi và từ 6-18 tuổi. Cả ba giai đoạn trên, trẻ em được giáo dục, dạy dỗ của gia đình lớn lên chịu ảnh hưởng các chuẩn mực trong gia đình và dần dần tiếp cận các chuẩn mực ngoài xã hội.

                                                                                                        Tham khao nha <3

  1. Dòng chứa tất cả các axit là dòng D.
  2. Tên các axit đó là 
  • \(H_3BO_3\) - Axit boric
  • \(H_2SO_4\) - Axit sunfuric
  • \(H_2SO_3\) - Axit sunfurơ
  • \(HCl\) - Axit clohydric
  • \(HNO_3\) - Axit nitric

Vừa qua nó bị lỗi dòng, cô gửi lại nhé:

Dòng chứa tất cả các chất axit là dòng D.

\(H_3BO_3-\text{Axit boric}\)

\(H_2SO_4-\text{Axit sunfuric}\)

\(H_2SO_3-\text{Axit sunfurơ}\)

\(HCl-\text{Axit clohiđric}\)

\(HNO_3-\text{Axit nitric}\)

6 tháng 9 2019

I. Nội qui tham gia "Giúp tôi giải toán"

1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;

2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.

3. Không "Đúng" vào các câu trả lời linh tinh nhằm gian lận điểm hỏi đáp.

Các bạn vi phạm 3 điều trên sẽ bị giáo viên của Online Math trừ hết điểm hỏi đáp, có thể bị khóa tài khoản hoặc bị cấm vĩnh viễn không đăng nhập vào trang web.

6 tháng 9 2019

nghĩa là ' tôi phải đi số 1 \ tôi phải đi số 2 ' đúng ko ?

22 tháng 3 2020

Mn ơi giúp mình với  :D

#TTT

Choose the best option to complete each of the following sentences.  5. You can speak English fluently, __________?A. could youB. can’t you C. can you D. couldn’t you   6. On average, _________Moon is 384.400 km from ___________ Earth.A. the-theB. x-theC. a-an D. a-the  7. _________ my opinion, he is the best football player in our team.A. OnB. AtC. InD. From  8. On March 8th , women often _____ beautiful roses, postcards, lots of gifts with the best   wishes from their relatives and...
Đọc tiếp

Choose the best option to complete each of the following sentences.

  5. You can speak English fluently, __________?

A. could you

B. can’t you

C. can you

D. couldn’t you

  6. On average, _________Moon is 384.400 km from ___________ Earth.

A. the-the

B. x-the

C. a-an

D. a-the

  7. _________ my opinion, he is the best football player in our team.

A. On

B. At

C. In

D. From

  8. On March 8th , women often _____ beautiful roses, postcards, lots of gifts with the best   wishes from their relatives and friends.

A. give

B. send

C. have

D. receive

  9. The driver stopped ______ a coffee because he felt sleepy.

A. have

B. to have

C. having

D. had

  10. I wish I ______ play football well.

A. can

B. could

C. am

D. did

  11. If I ________ you, I would join this English Speaking Contest.

A. were

B. am

C. would be

D. will be

  12. _______ there is a lot of noise in the city, I like living there.

A. Because

B. Despite

C. In spite of

D. Although

  13. I suggest ________ a shotcut through the field . It will take much less time.

A. take

B. taking

C. to take

D. takes

  14. She has a lot of ___________ while she’s studying English.

A. difficult

B. difficulties

C. difficile

D. diffident

   15. He finds the way to a place easily. He was a very good sense of ___________

A. direction

B. humor

C. style

D. responsibility

16. There are lots of people who _____ work in remote and mountainous areas  nowadays.

A. volunteers

B. voluntary

C. voluntarily

D. volunteer

   17. If you want to _____ the other students in your class, you’ll have to work very hard.

A. catch up with

B. learn on

C. catch up

D. hurry up

 

  Mark the letter A, B,C or D to indicate the correct answer to each of the following        questions.

  18. -  Mary: “ Thank s for your help, John.”    

        - John:   “ ______________”

A. There’s nothing

C. It’s my pleasure

B. Nothing

D. It sounds good

   19. – Lan: “ Do you think Covid-19 is one of the most dangerous diseases?”

         -  Mai: “ ________________”

A. Well that’s very surprising

C. Not at all. Go ahead.

B. Sure. Thanks.

D. There’s no doubt about it.

   

  Choose one underlined part that is incorrect in each of the sentences.

   20. Some of the students seemed very nervously before the final exam.

             A                         B                                    C          D

   21. The number of students are not large, therefore, a number of tickets are available to   

               A                                      B                                                   C                                          D

   them.   

    22. You should take the raincoat with you in case it will rain hard this afternoon.

                                A                         B               C              D

    23. Her sister always runs more quickly as her.

                                A       B               C       D                   

    24. As soon as he completes his homework, he helps feed the chickens and collects the

                                     A                         B                                              C                 D

     eggs.

    Choose the sentence that is closest in meaning to each of the sentences given.

    25. My father often played football when he was young.

    A. My father used to play football when he is young.

    B. My father used to play football when he was young.

    C. My father used to playing football when he was young.

    D. My father used to playing football when he be young.

    26. The teacher said “ You must prepare your lessons before going to class”.

    A. The teacher said that you must prepare your lessons before going to class.

    B. The teacher said that we must prepare your lessons before going to class.

    C. The teacher said that we had to prepare our lessons before going to class.

    D. The teacher said that we had to  preparing our lessons before going to class.

    27. He bought this book last week.

    A. This book was bought by him last week.

    B. Last week, this book was bought by him.

    C. This book is bought by him last week.

    D. This book was bought by he last week.

    Choose the sentence that best combines each given pair of sentences.

    28. I was very tired. I went to bed early.

    A. I was very tired but I went to bed early.

    B. Although I was very tired but I went to bed early.

    C. I went to bed early when I was very tired

    D. I went to bed early because I was very tired.

   29. He was sitting on a chair. It was uncomfortable.

    A. The chair who he was sitting on was uncomfortable.

    B. The chair which he was sit on was uncomfortable.

    C. The chair which he was sitting on was uncomfortable.

    D. The chair whom he was sitting on was uncomfortable.

30. They heard about his bad marks. They were sad.

   A. They are sad that they heard about his bad marks.

   B. They were sad because of they heard about his bad marks.

   C. They were sad that they heard about his bad marks.

   D. They were sad so they heard about his bad marks.

   Read the following passage and choose the correct answer.

       I began teaching career nearly six years ago. I spent six years (31) _____ in a remote      village where the villagers were very poor and the living standard was low. Sometimes I was very (32)______ because of bad living condition (33)________ low pay. I was really homesick. However, at that time, with my youth enthusiasm. I tried my best to devote myself to the noblest career that was ‘teaching’. I love my poor (34)________ students (35)_______ were living in poverty. Despite the poor life, they couldn’t suffer from empty mind.

31. A. taught

B.  teaching

C. teaches

D. to teach

32.A disappointed

B. disappoints

C. disappointing

D. disappoint

33. A. so

B. because

C. and

D. although

34. A. few

B. less

C. some

D. little

35. A. who

B. which

C. whom

D. where

Read the passage and choose the best answer for each question.

Truong Yen Festival is from the 9th to the 11th day of the third lunar month, the main festival day is on the 10th day of the third lunar month. This festival is celebrated in Truong Yen Commune, Hoa Lu District, Ninh Binh Province and by the locals. The festival is in memory of the Kings of the Dinh and Le dynasties. The festival lasts for three days with many traditional games and martial arts. There are many cultural and sports activities, including a procession to carry water from the Hoang Long River to the King Dinh and King Le temples, a drum festival, and volleyball, human chess, and folk games... The most special about the Truong Yen Festival is a game called " maneuver game with red flag", which replays the childhood of Dinh Bo Linh as a buffalo boy in Truong Yên.

 36. What is the best title of the passage?

A. The Kings Festival

C. Activities of a Festival   

B. The Festival in Ninh Binh Province

D. Truong Yen Commune

 37. How long does Truong Yen Festival last?

A. Three days        

C. On the 10th day 

B. From the 9th to the 11th day.

D. During the third lunar month.

38. What is the most special about the Truong Yen Festival?

A. Many traditional games and martial arts.

B. Many cultural and sports activities.

C.  The game replays the childhood of the King Dinh.

D.  In memory of the Kings of the Dinh and Le dynasties.

39. What does the word “which” in the passage mean?

A. Martial arts         B. Cultural activities           C. Sports activities        D. A game

40. Which of the following is not TRUE?

A. The festival is in honor of the Kings of the Dinh and Le dynasties.

B. The third day of the tenth lunar month is the main festival day.

C. There are many traditional games and martial arts.

       D. Dinh Bo Linh was a buffalo boy in Truong  Yen      

2
4 tháng 3 2022

Có gì đó sai sai thì phải, Anh -> Hoá:)

4 tháng 3 2022

  5. You can speak English fluently, __________?

A. could you

B. can’t you

C. can you

D. couldn’t you

  6. On average, _________Moon is 384.400 km from ___________ Earth.

A. the-the

B. x-the

C. a-an

D. a-the

  7. _________ my opinion, he is the best football player in our team.

A. On

B. At

C. In

D. From

  8. On March 8th , women often _____ beautiful roses, postcards, lots of gifts with the best   wishes from their relatives and friends.

A. give

B. send

C. have

D. receive

  9. The driver stopped ______ a coffee because he felt sleepy.

A. have

B. to have

C. having

D. had

  10. I wish I ______ play football well.

A. can

B. could

C. am

D. did

  11. If I ________ you, I would join this English Speaking Contest.

A. were

B. am

C. would be

D. will be

  12. _______ there is a lot of noise in the city, I living there.

A. Because

B. Despite

C. In spite of

D. Although

  13. I suggest ________ a shotcut through the field . It will take much less time.

A. take

B. taking

C. to take

D. takes

  14. She has a lot of ___________ while she’s studying English.

A. difficult

B. difficulties

C. difficile

D. diffident

   15. He finds the way to a place easily. He was a very good sense of ___________

A. direction

B. humor

C. style

D. responsibility

16. There are lots of people who _____ work in remote and mountainous areas  nowadays.

A. volunteers

B. voluntary

C. voluntarily

D. volunteer

   17. If you want to _____ the other students in your class, you’ll have to work very hard.

A. catch up with

B. learn on

C. catch up

D. hurry up

 

25 chất khí ở nhiệt độ phòng là:

Oxi, O2

Hydro, H2

Nitơ, N2

Nitric oxit, NO

Cacbon monoxit, CO

Cacbon đioxit, CO2

Boran, BH3

Amoniac, NH3

Nitrơ oxit, N2O

Điboran, B2H6

Metan, CH4

Etan, C2H6

Etilen, C2H4

Axetilen, C2H2

Fomanđehit, CH2O

Photpho pentaflorua, PF5

Bis(triflometyl)peoxit, (CF3)2O2

Đimetyl ete, (CH3)2O

Metoxietan, C2H5OCH3

Photphin, PH3

Lưu huỳnh đioxit, SO2

Lưu huỳnh monoxit, SO

Hydro clorua, HCl

Hydro florua, HF

Lưu huỳnh hexaflorua, SF6

Silan, SiH4

11 tháng 1 2021

Đáp án D.