Đáp án:
Giải thích các bước giải:
gọi công thức tổng quát của ancol là CnH2n+1Oh
ta có M ancol=1,4375.32=46 gam/ mol
⇒ 12n+2n+18=46
⇒n=2
vậy ancol là c2h5oh
Xin hay nhất
Nêu một số hiện tượng ứng dụng ảnh hưởng các chất hóa học vật lý đến sinh trưởng của vi sinh vật ?
phân biệt văn bản biểu cảm -miêu tả - tự sự - nghị luận
V. Write the correct form or tense of the verbs in brackets. 1. In 2017, they ____________ (install) solar panels to provide heat for their hot water. 2. I ____________ (visit) Rio de Janeiro twice so far. It's very diverse! 3. Tomorrow at 8p.m James ____________ (watch) a film on Netflix. 4. I think that driverless cars ____________ (use) widely in the next two decades. 5. Overcrowding ____________ (cause) huge problems such as housing, congestion, unemployment and air pollution. 6. Look, Janet! The boy over there ____________ (ride) a Segway. 7. Since 1990, the population of the city ____________ (grow) by 110,000 people 8. Hoi Mua Festival ____________ (hold) every March to thank the God for the crop. 9. My father installed glass in the windows to stop heat ____________ (escape) 10. I'd prefer ____________ (have) a hoverboard, so that I can fly to school!
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Ý nghĩa của việc phân nhóm thức ăn. Kể tên các nhóm đó
máy điện áp một pha có trức năng gì
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viết văn tả ca sĩ Jack (ko copy)
VI.Read the passage again and then answer the following questions. The first reason why many families do volunteer work is that they feel satisfied and proud. The feeling of fulfillment comes from helping the community and other people. In addition, volunteering is a great way for families to have fun and closer. But many people say they don’t have time to volunteer because they have to work and take of their families. If that’s the case, try rethingking some of your free time as a family. You could select just one or two projects a year and make them a family tradition. For instance, your family can make and donate gift blankets for the old homeless people on holidays. Your family can also spend only one Saturday morning a month collecting rubbish in your neighborhood. 31. How do people often feel when they volunteer? …………………………………...………………………………………………………… 32. How can your family benefit from doing volunteer? …………………………………...………………………………………………………… 33. Why don’t some people have time to volunteer? …………………………………...………………………………………………………… 34. How can your family help the old homeless people? …………………………………...………………………………………………………… 35. Is collecting rubbish in the neighborhood an example of volunteer work? …………………………………...………………………………………………………… VII.Make questions for underline words: 36. Mr Hung has been to Paris twice →……………………………………………………………………………..…………… 37. She went to the doctor because she was sick →…………………………………………………………………………..……………… 38. He went to football club by car. →……………………………………………………………………………..…………… 39. My uncle will move to Ho Chi Minh City next year →……………………………………………………………………………..…………… 40. They used to start their work at 6 o’clock. →……………………………………………………………………………..……………
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