Bài 1: Hoà tan 8,9 gam hỗn hợp Mg, Zn vào lượng vừa đủ dung dịch H₂SO₄ 0,2M thu được dung dịch A và 4,48 lít khí H₂ ở đktc

a, Tính thành phần % theo khối lượng của mỗi kim loại

b, Tính thể tích dung dịch axit đã dùng biết lượng axit dùng dư 10% so với lượng phản ứng

Hoà tan 2,7 g Al vào 100 gam dung dịch H₂SO₄ vừa đủ thu được V lít khí H₂ sinh ra (ở đktc)

a, Tính giá trị V

b. Tính nồng độ % của dung dịch H₂SO₄ và dung dịch sau phản ứng

Bài 1: Cho m gam hỗn hợp Fe và Cu trong dung dịch axit clohidric 10% (vừa đủ). Phản ứng xong thu được 1,12 lít khí (đktc), dung dịch X và còn 6,4 g chất rắn không tan

a, Viết phương trình phản ứng xảy ra. Tính m.

b, Tính khối lượng dung dịch HCl đã dùng.

c, Tính nồng độ % của chất có trong dung dịch X

Write sentences using "WISH/WISHES"

1. I don't know many people in Hanoi.

I wish .............

2. I don't have a car.

He wishes .............

3. Lan isn't here and I need to see her.

I wish .............

4. I'd like to go to the party but I can't.

I wish .............

5. I am in the swimming pool all day because it's very hot today.

My child wishes .............

6. I don't understand what the man says.

The foreigner .............

7. My best friend will leave for Bangkok tomorrow and I'm very sad.

I .............

8. We can't live together forever!

We .............

9. My grandmother always complains about something or other.

Ted .............

10. My little brother makes a lot of noise when he comes back from school.

I .............

11. I don't know many people in the town.

My new neighbor .............

12. It would be nice to be able to fly a plane.

She .............

13. It's a shame I don't have a key.

I .............

14. Ann isn't here and I need to see her.

I .............

15. I don't like being so short.

The young boy .............

16. Unfortunately, I have to work tomorrow.

I .............

17. Don't shout all the time. It's so annoying.

I .............

18. I'm sorry, I can't go to the party

I .............

19. I'd like to get access to the Internet, but I don't have a computer.

Emily .............

20. It's a pity the weather isn't better today.

They .............

21. Our classroom doesn't have any windows.

We .............

22. The sun isn't shining right now.

The students .............

23. Lan doesn't know how to make a cake.

24. We live ina small flat in the City.

25. Please don't say things like that.

Rewrite the following sentences

1. It was such a high wall that we couldn't climb over the wall. (too... to)

2. The room is so tidy that it took us one hour to clean it. (such... that)

3. It is such a long film that they canh broad cast it on one night. (so... that)

4. The weather was so warm that they had a walk in the garden. (enoug... to)

5. It was such a funny story that he couldn't stop laughing. (to... to)

6. The match was so exciting that all the fans shouted loudly. (such... that)

7. There is so much rain that we canh go out. (such... that)

8. The milk is excellent enough for the children to want some more. (so... that)

9. My sister is too young to go to the zoo alone. (so... that)

10. There were so many people in the hall that we couldn't see him. (such... that)

11. They drunk such a lot of coffee that they couldn't sleep all night. (so... that)

12. The road is too narrow for two cars to pass each other. (enough... to)

13. The game is too difficult for the children to play. (enough... to)

14. Alice had so many exercises to do that she couldn't go out. (such... that)

15. He runs so slowly that he canh win a prize. (too... to)

16. The downtown area is too crowded for you to get a taxi. (so... that)

17. The weather was lovely enough for us to spend the whole day in the garden. (such...that)

18. He drank such a lot of coffee that he couldn't get to sleep. (so... that)

19. I was so tired that I fell asleep in the armchair. (enough... to)

20. The exam was so difficult that most of the students couldn't do it. (such... that)

21. My father is such a busy man that he doesn't have any free time. (too... to)

22. It is such an illegible handwriting that I can't figure out what this sentence says. (so... that)

23. His son's feet are so big that he has difficulty finding slippers to fit him. (too...to)

24. The composition was so bad that I couldn't read it (too...to)

25. The book is so interesting that we have read it many times. (such...that)

26. He drives too fast for me to call. (so...that)

27. The food is too hot for the old woman to eat. (enough)

28. This folk song is simple. Everybody can sing it.

29. The little girl looks miserable. We all feel sorry for her.

The little girl ............

30. That tower was very high. We couldn't climb it up.

That is ............

31. The tale story is very exciting. We want to hear it again.

It is ............

32. I don't think Mary is old enough to get married.

I think Mary ............

Cho hình chữ nhật ABCD có AD < AB . Qua C kẻ đường thẳng vuông góc với AC cắt đường thẳng AD, AB lần lượt tại M và N

a, Cho AD = 6cm, AB = 8cm. Tính DM, AN, góc AMN ( số đo góc làm tròn đến độ )

b, CM: AB . AN = AD . AM

c, CM: CB.CD = \(\frac{AC^3}{MN}\)

d, Gọi E là trung điểm MC. Kẻ CH vuông góc DB tại H. Cho EB cắt CH tại K. CM: K là trung điểm của CH

Một lớp học thuê một hướng dẫn viên cho chuyến tham quan, có 2 công ty được liên hệ để lấy thông tin về giá :

- Công ty A có phí dịch vụ ban đầu là 400 nghìn đồng cộng với 3 nghìn đồng cho mỗi km hướng dẫn

- Công ty B có phí dịch vụ ban đầu là 300 nghìn đồng cộng với 3 nghìn 500 đồng cho mỗi km hướng dẫn

a, Lớp học nên chọn công ty nào để thuê hướng dẫn viên nếu biết rằng chuyến đi sẽ đến một địa điểm nào đó với tổng khoảng cách đi lại là 250km

b, Nếu đi khoảng cách là bao nhiêu thì chọn công ty A có lợi hơn