Đốt cháy hoàn toàn 0,15 mol hidrocacbon A thu được sản phẩm cháy hấp thu hết vào bình đựng dd Ca (OH)₂ dư thu được 60g kết tủa trắng và khối lượng bình tăng lên 37,2 g. Công thức phân tử của A là?

Đốt cháy hoàn toàn 1,45 g hidro cacon A thu được 2,24 l CO2 đo ở đktc và m g nước. Xác định CTPT của A biết dA/O2=1,8125

Đốt cháy hoàn toàn hidro cacbon A thu được 5,6 l khí CO2 và 6,75 g H2O. Tỷ khối dA/H2=15. Xác định CTPT của A

Exercise 1: Circle the best option (A,B,C or D) to complete the sentence.

1. Peel the carrot and ________ it into small pieces.
A. chop B. whisk C. steam D. roast

2. He’s very busy; he has ________work.
A. a lot of B. many C. a lot D. lots

3. If you don’t know how to spell a word, you ________ look it up in the dictionary.
A. must B. will C. should D. ought

4.If the sun ________, we ________ for a walk.
A. shines - will go B. shone - will go
C. shone - would go D. had shone - would go

5. You’ll fail the exam ________ you start revising.
A. if B. until C. when D. unless

6. Unless we ________ more snow, we can’t go skiing.
A. will have B. have C. have had D. had

7. Rita plays ________ violin and her sister plays ________ guitar.

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

8. ________ is a trip to see or hunt wild animals, especially in east or southern Africa.
A. Expedition B. Safari C. Journey D. Adventure

9. ________ means a holiday/vacation that is organized by a company at a fixed price
and that includes the cost of travel, hotels, etc.
A. Full board B. Round trip C. Package tour D. Expedition

10. They haven’t …………………their mind about where to go on their honeymoon.
A. broken up B. made up C. set up D. put up

11. I think you should stop smoking.
A. If I am you, I will stop smoking.
B. If I were you, I will stop smoking.
C. If I were you, I would stop smoking.
D. If I had been you, I would stop smoking

12. He stepped on the mine, and it exploded.
A. If he doesn’t step on the mine, it doesn’t explode.
B. If he doesn’t step on the mine, it won’t explode.
C. If he didn’t step on the mine, it wouldn’t explode.
D. If he hadn’t stepped on the mine, it wouldn’t have exploded.

1.…………is an unusual, exciting or dangerous experience, journey or series ofevents.

A. Adventure B.Expedition C.Journey

2.…………meansanactoftravellingfromoneplacetoanother,especiallywhenthey

are far apart.

A. Expedition B.Adventure C.Journey

3. ………………… is defined as an organized journey with a particular purpose, especially to find out about a place that is not wellknown.

A. Expedition B.Journey C.Adventure

4.……..is a trip to see or hunt wild animals, especially in east or southernAfrica.

A. Expedition B.Safari C.Journey

5. ………………… means a holiday/vacation that is organized by a company at a fixed price and that includes the cost of travel, hotels,etc.

A. Fullboard B.Roundtrip C. Package tour

6. ………………… is defined as a type of accommodation in a hotel, etc. that includes all meals.

A. Fullboard B.Packagetour C. Roundtrip

7..……….is a road accident involving several vehicles crashing into eachother.

A. Pile-up B.Mix-up C.Touchdown

8.………….means a situation that is full of confusion, especially because somebodyhas

made a mistake.

A. Mix-up B.Touchdown C.Stalagmite