user-avatar
phamchanhung48
2 năm trước
Oxi hóa hoàn toàn 4,02 gam một hợp chất hữu cơ X chỉ thu được 3,18 gam Na2CO3 và 0, 672l khí CO2. Xác định công thức đơn giản nhất của X
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

1. Complete these sentences with the correct form of the word in bracket. 1. Lan looks more ……………than her sister (beauty). 2. A dog has bitten Hung, so he needs an anti – tetanus ……….. (inject). 3. Scientists have succeeded in finding a more effective ………. for this cancer (treat) 4. The injured woman was carried out of the accident on a ………. (stretch) 5. Environmentalists are doing everything to ………… the impact of the oil spin (minimum) 2. READING Life is changing rapidly in the large cities of England. However, life in other areas remains much the (1) ……. as it has been for centuries. Factories have brought huge population increases to the cities, and city life boomed. City residents have discovered a new (2) …… of life, but in country villages the traditional lifestyle has remained nearly (3) ….There have been a few changes, particularly the new steam-powered machinery. It made farm production more (4)……. But for the people who remain in the countryside, daily life continues much as it had before the (5)…….. Revolution. Life in country villages continues to (6) …… at a slow pace. The daily schedule depends on the times that the sun rose and set and on the weather. In a typical village, the (7) …… number of workers is still employed in agriculture or in domestic service. A smaller number of people work in various trades. Even (8) ……work in the professions. a. Choose the most suitable word to fill in the blank 1. A. similar B. same C. different D. difference 2. A. method B. walk C. way D. path 3. A. changeful B. changeable C. unchanged D. change 4. A. efficient B. efficiently C. efficiency D. inefficient 5. A. Industry B. Industrial C. Industrialize D. Industrialized 6. A. run B. walk C. move D. drive 7. A. largest B. biggest C. highest D. all are correct 8. A. more B. less C. few D. fewer b. Fill in the blank with one word/ phrase from the passage 1. The population in the city has increased because of ……………. 2. There have been hardly any changes in the ……………… in rural areas. 3. Steam - powered machinery helps ………………. a lot. 4. The daily schedule of people in the countryside depends on ……………. 5. Most countryside people in England work in agriculture or in ……………...

Exercise1: Find the word which has a different sound in the part underlined. 1.A. pleaSure. B. SHelf. C. SHeet. D. musiCIan 2.A. Sugar. B. SHare. C. maCHine. D. Same 3.A. leiSure. B. preSSure C. meaSure. D.garaGE 4.A. amAzing B. orAnge C.tAble. D. fAvourite 5.A. sEAt. B. tEA. C.nEAr. D.chEAp Exercise 2: Complete the sentences with the words in the box. *Box: cheapest, fly, most, chopsticks, rest, waiter, care, menu, Peel.* 1. Vietnamese people usually eat with.......... 2. The...... is the person who brings food in a restaurant. 3. In the restaurant, you look at a...... to choose your food. 4. Vietnamese people......a lot of their food. 5. You...... potatoes before cooking them. 6. Can I see the...... of the house? 7. My aunt is...... work and my aunt is shopping. 8. He takes........ of sick children. 9. The........apartment will be the best for you. 10. The.......... popular after school activities are baseball, football and basketball.

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team