Hào tan 16g hỗn hợp 2 kim loại Cu va 2 Mg vào dd HCl 7.3%. Sau phản ứng thoát ra 5.6l khí (đktc) và một chất rắn không tan.

a) Tính khối lượng chất rắn thu được và thành phần % về khối lượng của mỗi kim loại trong hỗn hợp

b) Tính khối lượng dd HCl

c) Nếu cho hỗn hợp kim loại trên hòa tan vừa đủ với dd CuSO₄ 20%. Tính khối lượng chất rắn thu được sau phản ứng và khối lượng dd CuSO₄ cần dùng

Rewrite these sentences

1. They finished their exercises on time yesterday

Their exercises............

2. It' s five years since we last met each other

We haven' t..............

3. He began to learn English 5 years ago

He has.....................

4. I started teaching Math at Nguyen Du School in 2013

I have..........

5. Alexander Graham Bell invented the telephone in 1876

The telephone..........

6. " We have a lift but very often it doesn' t work" they said

They said.......... ..

7. They have built a new hospital for the children

A new hospital.............

8. " where will your mother buy special foods for Tet?" Nam asked Mai

Nam asked........

9. Mr. Bill has reported a speech at our school since 8.30 am

A speech ...............

10. Nga began to study English in 2002

Nga has.........

Rewrite these sentences

1. The students have discussed the pollution problems since last week

The pollution problems..........

2. " When does your Tet holiday star?" she asked me

She asked me............

3. I won' t spend my next summer vacation in the moutain

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

4. It' s apity, I can' t come her birthdayvparty tonight

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

5. My sister invited all his friends to her wedding party

All the friends of my sister..............

6. John took a lot of photos to show the trip to her parents

A lot of.................

7. The last time Trang wrote to her friend was two years ago

Trang hasn' t...............

8. I don' t have enough money to buy a new motorbike

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

9. She studied this foreign languageb3 years ago

She has.......................

10. My friend can' t pass the oral examination

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

11. The finished their exercises on time yesterday

Their exercises...................

12. It' s five years since we last met each other

We haven' t.....................

13. He began to learn English 5 years ago

He has..............

14. I started teaching Math at Nguyen Du School in 2013

I have..................

15. Alexander Graham Bell invented the telephone in 1876

The telephone..................

16. " We have a lift but very often it doesn' t work" they said

They said...................

17. They have built a new hospital for the children

A new hospital..............

18. " Where will your mother buy special food for Tet?" Nam asked Mai

Nam asked................

19. Mr. Bill has reported a speech at our school since 8.30 am

A speech..............

20. Nga began to study English in 2002

Nga has...............

Rewrite these sentences

1. I am late for the meeting

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

2. I want you not to it again

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

3. It's a bad day today and we can't go on a picnic

We wish.........

4. What a pity! The weather isn't fine enough for us to go swimming

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

5. I can't speak many languages

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

6. She wants to make a trip to the countryside now, but she can't

She wishes...........

7. I hate having to go to school on Sundays

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

8. I'd love to be a film star

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

9. You shoul pay your bill before you leave the hotel

Your bill...........

10. Poets have mentioned the " ao dai" in poems for centuries

The " ao dai" .........

11. She bought a new house last month

A new house..........

12. The teacher encourages the student to study harder next semester

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

13. They are going to build a bridge in my village

This bridge........

14. " Do you know who broke the window, the boy?" The man asked

The man asked.........

15. " Have you hurt yourself" he asked

He asked Susan...........

16. The interviewer said to me: " Why do you want this job?"

The interviewer asked me...............

Read and complete

Australia is situated in southern hemisphere............ the Indian Ocean and Pacific Ocean. This is the smallest..........and the 6th largest country in the world with the area of 7,692,024 sq km. The.......of the country is over 24 million (February 2016) and the capital is Canberra. Australia is a beautiful..........with the climate is generally arid to semiarid. The comon languages here are English and native.......... Australians are very kind and friendly. They love sports including rugby, football, golf, swimming and cricket. If you want to choose some places........your holiday, Australia will be an ideal place with a lot of sights such as Sydney Opera House, Uluru-Kata Tjuta National Park, Sydney Harbor Bridge, Palm Cove Beach......... You can also try delicious traditional..........like Barbecued shrimp, steak, dim sum, potato cakes and so on. Australia is really an..........country for us to visit

Combine these pairs of sentences, using who, which, where and whose

1. He met many friends. The friends encouraged him in his work

2. He often tells me about his village. He was born there

3. Can you understand the question? He asked you the question last time

4. The man is an architect. We play with his son every day

5. The city was very beautiful. We spent our vacation in that city

6. The train broke down twice on the way. It arrived two hours late

7. I stopped in a small town. My sister was working there

8. The book was rather difficult. I gave him that book

9. The picture has been stolen. You were talking about it

10. She is the girl. I bought these roses for her