Có bao nhiêu gam NaNO₃ kết tinh khi làm lạnh 300g dung dịch NaNO₃ bão hòa từ 80^oC xuống 10^oC. Biết độ tan của NaNO₃ ở hai nhiệt độ này là 180g và 75 g.

Cho biết độ tan của Al₂(SO₄)₃ là 33,5 gam (ở 10^oC). Lấy 1000 gam dung dịch Al₂(SO₄)₃ bão hòa ở trên làm bay hơi 100 gam nước. Phần dung dịch còn lại đưa về 10^oC thấy có a gam Al₂(SO₄)₃.18H₂O kết tinh. Tính a.

Hòa tan 5,6 gam sắt vào 400 gam dung dịch H₂SO₄ 4,9 %, sau khi phản ứng kết thúc thì thu được dung dịch X và một chất khí.

a/ Tính khối lượng muối thu được và thể tích khí thoát ra (ở đktc)?

b/ Tính nồng độ % của các chất trong dung dịch X.

): Choose the best answer to complete the following sentences.

1. After _______ you in Rome, I’m travelling to Sicily.

A visit B I will visit C to visit D visiting

2. She hasn’t got any brothers or sisters. She’s a(n) _____ child.

A alone B only C single D lonely

3. We set _____ on our trip at eight o’clock in the morning.

A up B off C over D for

4. He _____ ever plays football these days.

A nearly B almost C hardly D about

5. ‘What are you looking _____?’ ‘That big bird in the tree over there.’

A in B at C for D after

6. We had better _____ her what happened. She’ll be upset.

A not tell B not to tell C do not tell D not telling

7. We did some exciting _____ in science this morning.

A experiments B conclusions C experiences D discoveries

8. They _____ we went to Australia for a holiday.

A suggested B announced C told D invited

9. You _____ go there if you don’t want to.

A mustn’t B can’t C don’t have to D wouldn’t

10. We won’t go to the cinema _____ you come with us.

A in case B provided C unless D otherwise

11. Your cousin looks ____________ you. You could be sisters!

A just as though B as if C just like D alike

12. We sold our old school books ____________ raise money for charity.

A as a result of B so that C for D in order to

13. A: “Make your self at home.” B: “________________”

A Nothing much. B Thank you.

C Thanks. The same to you. D Not at all. Don’t mention it.

14. A: “________________” B: “Yes. Can I help you?”

A Excuse me! B How is every thing?

C Can I ask you something? D Nice to meet you.

15. A: “Have a nice day!” B: “________________”

A Not at all. B Yes, of course.

C No. It’s very cold. D Thanks. The same to you.

16. He was cooking breakfast ____________ he burned his hand.

A since B during C while D when

Question 4 (2.0pts): There is a mistake in each line of this text. Find it and correct it as in the example.

Question 2 (1.6pt): Complete the text with the correct words on the topic of politics. Use the words below.

candidates election parliament majority party support votes vote

If you are over 18 and on the Electoral Register, a polling card will be sent to your home before the date of the general 1 ________. Your polling card will tell you where you can 2 _________ . Once at the polling station, you will receive a ballot paper with a list of 3 ________ representing your constituency, together with an indication of their political 4 ________. You then cast your vote, marking the party you 5 ____________ on the ballot paper, and when the voting is complete, all votes will be counted and the party with the 6 ____________ of votes may form a government. When none of the parties gets enough 7 ____________ in the election to gain an outright majority, a hung 8 _________ occurs and the parties have to form a coalition.

Question 1 (1.0pt) Read the text. Choose the correct answers, A, B, C or D.

For some people Christmas is a(n) 1_____ time of year, but for others it can be extremely stressful. Because of this, some people prefer to forget Christmas and go 2______, preferably to somewhere warm and sunny. But, judging 3______ the number of people out shopping, it's a time of year that most people want to celebrate in some way. The streets are usually 4______ on Christmas day though, as most shops don't open. People usually stay 5______, opening presents and having their Christmas dinner. However, others prefer to eat 6______ in restaurants or 7______ relatives. If the weather is nice, many people go 8______ for a walk, especially if there's snow. After dinner, they enjoy 9______ in front of the TV or playing board games 10______ the family.

1 A crowded B empty C enjoyable D scary

2 A away B home C out D shopping

3 A at B by C on D to

4 A crowded B empty C enjoyable D scary

5 A background B indoors C outdoors D underground

6 A about B around C into D out

7 A go B have C play D visit

8 A background B indoors C outdoors D underground

9 A relax B to relax C relaxed D relaxing

10 A at B by C to D with

Question 1 (1.5pt): Complete the second sentence so that it has a similar meaning to the first one. Use the word given in brackets. You must use between three and five words, including the word given. Don’t change the form of the word given. 0 has been done as an example.

0. The children will probably go swimming tomorrow. (LIKELY)

=>The children are likely to go swimming tomorrow.

1. Walking along the green trees gave Liz pleasure. (ENJOYED)

Liz ________________________________ green trees.

2. The bookshelf was so high that the children couldn’t reach it. (FOR)

The bookshelf ________________________________ the children to reach.

3. Teachers always make their students work harder before exams. (ARE)

Students ___________________________________ harder before exams by their teachers.

4. Can you help me put the chairs away? (HELPING)

Would you __________________________________ the chairs away?

5. They say that this building is nearly 2000 years old. SAID

This building _______________________________ nearly 2000 years old.

6. “Don’t open that window, Daniel!” said the teacher NOT

The teacher told Daniel ______________________________ that window.

Question 2 (1.5pt): Make any changes and addition to build the sentences from the cues given. 0 has been done as an example.

0. I / not / much time, / so / not / use / Internet / very often.

I don’t have much time, so I don’t use the Internet very often. .

1. She / usually / get up / early but / get up / late yesterday.

______________________________________________________________________________

2. Nam's dad / mum / delighted / he / pass / English exam.

______________________________________________________________________________

3. She / tell / me / you / give / beautiful scarf / her birthday

______________________________________________________________________________

4. Chicago / situate / shore of / Lake Michigan, / one / Great Lakes.

______________________________________________________________________________

5. mailman / come / while / Lee family / sleep.

______________________________________________________________________________

6. She often / go / work / motorbike, / but today / travel / bus.