4) Dùng hóa chất thích hợp để nhận biết các chất rắn đựng trong các lọ mất nhãn sau:

a) CuO, Na₂O, P₂O₅                           b) CaO, CaCO₃, BaSO₄

5) Cho 2,7g CuCl₂ tác dụng hết với dung dịch NaOH. Sau khi phản ứng kết thúc ta thu đươc kết tủa D. lọc kết tủa D đem nung đến khối lượng không đổi thu được chât rắn E.

a) Viết các phương trình phản ứng.

b) Tính khối lượng kết tủa D và khối lượng chất rắn E.

6) Cho 100g dung dịch H₂­SO₄ 19,6% vào 400g dung dịch BaCl₂ 13%.

a) Viết phương trình phản ứng.

b) Tính khối lượng kết tủa tạo thành.

c) Tính nồng độ % các chất có trong dung dịch sau phản ứng.

7) Dẫn 5,6 lít khí CO₂ (đktc) đi qua 150ml dung dịch NaOH 1M.

a) Viết phương trình phản ứng.

b) Tính khối lượng các chất sau phản ứng.

8) Hòa tan17,6g hỗn hợp gồm MgCO₃ và CaCO₃ vào dung dịch H₂SO₄ 0,5M thì thu được 4,48 lít khí CO₂ (đktc)

a) Viết phương trình phản ứng.

b) Tính % về khối lượng mỗi muối trong hỗn hợp ban đầu.

c) Tính thể tích dung dịch H₂SO₄ đã dùng.

9) Trung hòa 30 ml dd H₂SO₄ 1 M cần dùng 50 ml dd NaOH

a) Tính nồng độ dd NaOH đã dùng

b) Nếu trung hòa dd H₂SO₄ ở trên bằng dd KOH 5,6% có khối lượng riêng 1,045 g/ml thì cần bao nhiêu ml dd KOH?

I. Choose the word which is pronounced differently from the other.

1. A. changed B. learned C. laughed D. earned

2. A. hope B. offer C. shop D. stop

3. A. shut B. cut C. sun D. push

4. a. baggy b. minority c. style d. symbol

5.. a. casual b. sale c. sleeveless d. slit

6. a. encourage b. young c. proud d. enough

7. a. embroider b. subject c. economic d. poet

8. a. inspiration b. famous c. occasion d. practical

II.Choose the word that has different tress pattern from the others.

1. A. region B. comprise C.Islam D. compulsory

2. A. association B. official C. divide D. religion

3. A. enjoy B. religion C. consist D. population

4. A. Chinese B. although C. instruction D. currency

5. A. primary B. religion C. tropical D. friendliness

6.A. compulsory B. comprise C. Malaysia D. region

7.A. association B.official C. divide D. together

8. A. enjoy B. religion C.divide D. population

9.A. Chinese B. although C. instruction D. currency

10.A. primary B. religion C. tropical D. friendliness

III. Choose the best answer A, B, C, and D in the following sentences:

1.They are really ……………. by the beauty of Ha long bay.

A. impression B. to impress C. impressed D. impressing

2. Lan made a deep ……………….on the members of his speaking English club.

A. impress B. to impress C. impressed D. impression

3. His ………………..made us happy.

A. unfriendly B. friendly C. unfriendliness D. friendliness

4. A lot of ……………….. come to Van mieu everyday.

A. visitor B. visitors C. visiting D. visited

5. What was he doing when you …………….?

A. come B. to come C. came D. coming

6. The Smiths enjoyed the ………………. Atmosphere in Vietnam.

A. peace B. peaceful C. peacefully D. peacetime

7. Hanoi is not ………… from Kuala Lumpur

A. difference B. differentC. Diffe D. differently

8. We went to see many ………………… places in Hanoi last year.

A. fame B. famous C. famously D. famousness

9. The …………. language in Malaysia is Bahasa Malaysia.

A. nation B. national C. Nationally D. nationality

10. I wish Mary ……………….harder for her examination.

A. will work B. worked C. has worked D. works

11. It’s very kind ……….. you to say so.

A. in B. to C. for D. of

12. Can you tell me how many chapters this book consists ……….. ?

A. of B. to C. with D. in

13. Vietnamese people are very …………….. and hospitable.

A. friend B. friendless C. friendly D. friendship

14. I come from Vietnam, so I am not used to ………… on the left.

A. drive B. drove C. driven D. driving

15. Although we are far away from each other, we still …………….

A. keep in touch B. say hello C. keep together D. keep on

Choose the best correct answer (2.0 pts) 1. Do you mind ________ the air-conditioner? It is too cold. A. turn on ​B. turn off ​C. turning on ​D. turning off 2. Sitting too long in front of the computer makes your eyes _______. A. tired ​B. harm ​C. boring ​D. relax 3. When you game online, be careful when you make friends with ________. A. girls ​B. Boys​ C. strangers ​D. your classmates 4. Anna prefers _______films to _________ books. A. watching/ reading ​B. watch/ read ​C. watching/ read ​D. watch/ reading 5. The phrase "window shopping" means: A. buying a window ​C. just looking without intending to buy B. going shopping through the window ​D. buying so many things at the same time 6. Do you fancy ________origami? A. making ​B. make ​C. doing ​D. do 7. I hate __________ up late to do homework. A. staying ​B. stay ​C. get ​D. getting 8. My younger brother used to detest ______ fish, but now he likes doing it. A. eats ​B. ate ​C. eating ​D. eat 9. Mai enjoys __________ to music, especially pop music in her free time. A. hearing ​B. playing ​C. listening ​D. talking 10. You should avoid ___________ too much TV. It’s not good for your eyes. A. seeing ​B. looking ​C. watching ​D. glancing 11. I don’t like _________ up early on winter days. I love _______ in bed late. A. getting/stay ​B. get/ stay ​C. getting / staying D. get/ staying 12. Why don’t we _________ our parents with some DIY projects? I think it is useful. A. help ​B. do ​C. make ​D. give 13. What did they do in their ______________ on an average day in the USA? A. leisure time ​B. free time​C. spare time ​D. All are correct. 14. We also work as _____________ for an animal protection organization. A. volunteers​B. volunteer​C. voluntary ​D. volunteering 15. Quang's his garden in his game is a _______ one. A. real ​B. virtual​C. imagination ​D. A & B 16. ____ DIY brings you a lot of amazing benefits. A. Eating​​B. Playing​​C. Doing​D. Hanging 17. Odd one out A. emailing ​B. hanging out ​C. Blogging​D. surfing the net 18. Mongolian children learn to ride when they are ................ as three years old. ​A. as young​B. younger​C. younger than​D. so young 19. Countryside is not polluted ................ you can breathe there fresh air. ​A. although​B. however​C. therefore​D. as 20.​ ‘Children in my village often fly their kites in dry rice fields.’ ‘................’ ​A. It’s right up my street!​B. That’s awesome. ​C. Exactly what I want.​D. How interesting! 21.​ We are all hook ................ making star lanterns. ​A. in​B. off​C. on​D. to 22.​ Their family have moved to the city ................2001. ​A. horn​B. for​C. in​D. since 23.​‘I find it hard to build a toy car.’ ‘But ................’ ​A. my pleasure​B. it’s my fault. ​C. it sounds great!​D. it’s right up your street! 24. Which one do you prefer, life in the ……..area or life in a modern town? ​A. far​B. further​C. distance​D. remote 25. I have stayed in a …….area for two weeks. The transportation was very inconvenient and there was no entertainment center to relax. ​A. rural​B. urban​C. outskirts​D. suburb 26.​My new sofa is ....................... than the old one. ​A. more comfortable​B. comfortably ​C. more comfortabler​D. comfortable 27.​My sister dances ....................... than me. ​A. gooder​B. weller​C. better​D. more good 28.​This road is ....................... than that road. ​A. narrower​B. narrow​C. the most narrow​D. more narrower 29.​He did the test ....................... I did. ​A. as bad as​B. badder than​C. more badly than​D. worse than 30. Yoga help us learn ................ to co-ordinate breathing and movement. ​A. what​B. when​C. why​D. how 31. Don’t worry. It is​_____to travel to that village even at night. ​A. safe​B. unsafe​C. difficult​D. inconvenient 32. Life in a small town is ................ than that in a big city. ​A. peaceful​B. much peaceful​ ​C. less peaceful​D. much more peaceful 33. The boys often help their parents to................​water from the village well. ​A. gather​B. collect​C. give​D. find 34. The Viet people have many................ customs and crafts. ​A. tradition​B. traditional​C. culture​D. customary 35.​We usually spend our holiday in the village ................ our grandparents live. ​A. what​B. where​C. which​D. when 36.I think country life is so boring and ................ because you’re not close to shops and services. ​A. unhealthy​B. inconvenient​C. comfortable​D. peaceful 37.On the farm, uncle Duong showed us how to ................ cucumbers. ​A. plough​B. produce​C. pick​D. put up 38.​We​to the countryside two months ago. ​A. go​B. have gone​C. went​D. will go 39. What will you do if you _________the final examinations? ​A. will pass​B. would pass​C. pass​D. passed 40. It rained hard.​, my father went to work. ​A. Therefore​B. However​C. Because​D.So …The end…

Mn cóa bài văn thuyết minh về cây bút nào mà có yếu tố thuyết minh, pp thuyết minh, kết hợp biện pháp nghệ thuật nào để làm cho cái đối tượng thuyết minh đc hấp dẫn sinh động ko? (Chỉ rõ các yếu tố ra giùm em với ạ)

Cho tam giác ABC cân tại A và 2 đường cao BH và CK gặp nhau tại S (H thuộc AC, K thuộc AB). Chứng minh SH . SB = SK . SC

Hòa tan dd K2CO3 13,8% vào 200g dd HCL 7,3% A tính khối lượng dd K2CO3 tác dụng B tính thể tích khí sinh ra ở đktc C tính khối lượng muối sinh ra