Trình bay cach nhan biết cac muối clorua , bromua , iotua , va cac axit tương ứng...

Đề bài: Một viên đa có khối lượng m=100g, được ném thang đứng lên cao với v=10m/s từ mat đat. g=10m/s bỏ qua sức can của không khí.

a/ Tính động nang lúc ném...Cơ nang củ viên đa

b/ Tính độ cao cực đai ma viên đa đat được. Tính thế nang của vat lúc bat đau tha

c/ tính v=? khi cham đat

d/ v=? khi động nang = thế nang

e/ khi vat cham đat nó lún sau vao trong đat 4cm. tính lực can của đat tdung lên vat

43. although he took taxi, Bill still arrived late for the concert.==> Despite...............

44. Theater seats can be booked by telephone.==>You.............

45. Your little brother's hir is so long that he can't see through it.==> Your little brother ought to.............

46. I've never been to less exciting concert. ==>It was

47. '' I'll never come back here again,'' said the angry tourist. ==> The angry tourist..................

48. The red car is $25.000. The blue car is $15.000 (Comparision)

49. Because of being lost, we stopped to ask policeman for directions. ==>We................

50. We re worried because we have to live very far from our parents. ==>We wish................

51. He hasn't been to the doctor's for over yers.==> He hasn't had ..........

52. That old keyboard is not worth repairing.==> It is pointless to....................

REWWITE THESE SENTENCES

1. Would you like me to finish the work tonight? ==> I'll...............

2. The man seems very lonely. His wife and children are away. (Relative clause)

3. The coffee was very hot. I couldn't drink it. (too)

4. The ice is quite thick. We can walk on it .(enough)

5. The children ran away . They broke the window. (after)

6. He can't speak Chinese. I can't speak Chinese. (neither)

7. There were some big old trees on this street 20 years old. ==> There used...............

8. John lives quite near his aunt's house. ==> John doesn't............................

9. It was such a hard cake that I couldn't eat it. ==> the cake......................

10. Linh is a better cook than Hoa. ==> Hoa can't...................

11. I last heard this song ten years ago. ==> It is.....................

12. '' You'd better not lend that man any more, Mary'' said John. ==> John advised...................

13. It was a two - hour flight from HN to HCM city. ==> It took.......................

14. When he is asked about past, he hates it. ==> He hates....................

Cho sản phẩm tạo thành khi đun nóng hỗn hợp gồm 5,6g bột sắt và 1,6 bột lưu huynh vào 500ml dung dịch HCl thì thu được khí bay ra và một dung dịch A

a, Tỉnh thành phần % về thể tích của hỗn hợp khí

b, Đê trung hòa HCl còn thừa trong dd A phải dùng 125ml dd NaOH 0,1M. Tính nồng độ mol của dung dịch HCl đã dùng.........

Bài tập Tìm lỗi sai và sửa.

1. If I had known that you were ill, I had gone to see you

2. You should bring an umbrella in order protect yourself from rain.

3. When does your daughter practice singing all day for? - to become a singer.

4. You'd better visit Hue, which used to be a capital of Vietnam.

Tiếp nha ....Các b làm tốt lắm

13. Peter has practised playing the piano.......................the piano contest next week.

A. in order enter B. to entering C. to enter D. to not enter

14. ....................did you stay there? - I spent three wonderful weeks there.

A. How long B. How far C. How much D. How often

15. Like language, mUsic is used to...................

A. entertain B. entertainment C. communicate D. communication

16.She prefers Science fiction films................detective ones.

A. on B. than C. like D to

17. The coins ................... to be over a thousand years old.

A. is mention B. is mentioned C. are mentioning D. are mentioned

18.Where is ............... letter which I put on ........... desk.

A. a/the B. a/an C. a/a D. the/the

19.Yesterday, while I was walking to school, I saw...........bird on..........tree.

A. a/a B. the/a C. a/the D. the/the

20. Mai and I have dicided to have a party. We ........... lot of people.

A. will invite B. are inviting C. invited D. are going to invite

21. I ............... thriller film to action film.

A. like B. prefer C. would rather D. enjoy

22. I find horror films really................

A. disgust B. disgusts C. disgusting D. disgusted

23. All the fans jumped about in...........when their team scored the final penalty.

A. exciting B. excised C. excisetingly D. excisement

24.What a ............... experience !

A. terror B. terrify C. terrified D. terrifying

25. Don't let children see.............films.

A. horror B. horrifying C. horrified D. horrible

26. His foolish mistakes .................. all of us.

A. amusing B. amused C. amusement D. amuses

27. To the great .................... of all the audience, the actor's beard fell off.

A. amusement B. amusing C. amuse D. amused

28. Many laws ........... in nature's defense.

A. are passed B. have passed C. are passing D. were being passed

29.The international football .............. is held every four years.

A. match B. contest C. tournament D. game

30. Germany was the.................... of the 2006 World Cup. The 18th World Cup was held there.

A. trophy B. host nation C. continent D. tournament

31. The World Cup is considered the most popular sproting event in the World.

A. competed B. regarded C. witnessed D. organized