Trong một phòng bếp kín cửa, bình gas bị rò rỉ, nếu bật bếp gas hoặc có mồi lửa sẽ gây hiện  tượng cháy, nổ. Làm thế nào để nhận biết bình gas bị rò rỉ khí gas? Em hãy nêu cách giải quyết cụ thể  khi gặp tình huống này.

(Fe = 56; O = 16; K = 39; Cl = 35,5; P = 31; H = 1; Zn = 65; Cu = 64)

Câu 5. Cho kẽm tác dụng với dd HCl dư sau phản ứng thu được kẽm clorua (ZnCl_{2) và 3,36 lít khí}  H2 (đktc).

a) Viết phương trình hoá học của phản ứng xảy ra.

b) Tính khối lượng của Zn phản ứng.

c) Lượng hidro tạo thành cho tác dụng với 16 g đồng (II) oxit. Tính khối lượng kim loại đồng tạo  thành.

MONG MỌI NGƯỜI GIÚP MÌNH VỚI Ạ

1. Đốt cháy 16,8 g sắt trong không khí.

a) Tính khối lượng sản phẩm thu được.

b) Tính thể tích không khí (đktc) tham gia phản ứng (biết VO2 = 1/5 Vkk)

từ các chất ban đầu là đá vôi ( CaCO3 ) , nước . hãy trình bày phương pháp điều chế hai oxit và hai đơn chất khi khác nhau từ các chất trên

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

  5. You can speak English fluently, __________?

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

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

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

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

  10. I wish I ______ play football well.

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

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

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

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

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

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

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

  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:   “ ______________”

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

         -  Mai: “ ________________”

  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.

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?

 37. How long does Truong Yen Festival last?

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