user-avatar
caohuymtp001
2 năm trước
Có 1 hỗn hợp khí gồm oxi và ozon. Hỗn hợp khí này có d/H2 = 18. Hãy xác định thành phần % theo thể tích của hỗn hợp khí. Cho 8,4 gam kim loại M tác dụng hoàn toàn với oxi thu được 11,6g oxit. Xác định tên kim loại M.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

1. It’s difficult for me to learn a foreign language. -> I find ……………………………………………………………………………………….. 2. It took her 3 hours to get to the city centre. -> She spent …………………………………………………………………………………… 3. It is such a beautiful girl that everybody loves her. -> She is so ……………………………………………………………………………………. 4. The food is contaminated. People’s health is poor. (results in) ………………………………………………………………………………………………… 5. I’m not you, but I think you should recycle these plastic carrier bags (If) …………………………………………………………………………………………………

mọi người giúp em giải với ạ nếu ai trả lời trước ngày 22/3/2020 mà đúng thì em sẽ vote 5 sao cảm ơn 3. Read and fill in each gap with one suitable word. My hobby is reading. I started ____________ when I was a small child. I loved the stories my father told me every night before I slept and have kept them in my ___________until now. As soon as I could I learned to read. I read picture books and funny stories. Now I read everything I find interesting _______ useful. Reading enables me to learn about ________ things. From the books I learn how people live, how things around us go on, learn about the wonders of the ____________, space travel, human achievements and many other things. Books provide ___________ with facts and information. The wonderful thing about reading is that it teaches me how to live and behave well, how to avoid the danger in life. Books will be good ____________ forever. 1. Read the following passage carefully and answer the following questions. Sally Ride, America’s first spacewoman, doesn’t look very different from a lot of other American professional women. She is attractive, with curly brown hair, dark brown eyes, and a bright smile. She likes to dress simply, she wears comfortable but colorful clothes, like many people from California. But in 1983 Sally Ride became America’s first woman astronaut. She was one of the five astronauts on the space shuttle Challenger, which completed a successful six-day voyage in space in June 1983. What makes a woman want to go into space? Sally Ride grew up in Los Angeles, California. Her father is a professor at Santa Monica College, and her mother is a housewife. At Westlake High School for girls, she was both an excellent student and tennis player. Today she still looks like a sportswoman. She is 1.6 metres tall, weighs 52 kilos, and is very fit. When she was still a student, she became a very successful tennis player. She thought about becoming a professional sportswoman but she decided to continue with her studies at college, and later at university. 1. Who is America’s first spacewoman?............................................................................................................ 2. What does she look like? ................................................................................................................... 3. When did she become America’s first spacewoman?............................................................................ 4. How long did she travel in the space shuttle Challenger?........................................................................ 5. What did her parents do?............................................................................................................................ 6. Did she play tennis well? And was she a professional sportswoman?...................................................... 2. Read the passage carefully and choose the best word (A, B, C or D) to fill in each gap. YURI GAGARIN Yuri Gagarin was accepted into the cosmonaut training team in 1960. On April 12, 1961, he made the world’s first (1).................... . In 1967 he started training for his second spaceflight. In February 1968 he (2).................... from the Zhukovsky Air Force Engineering Academy. For services in opening up (3).................... he was decorated with many orders and medals of the Soviet Union, and Hero of Socialist Labour in Czechoslovakia, Bulgaria and Vietnam. He was an(4).................... citizen of 14 cities in the USSR and other countries, a deputy to the Supreme Soviet and a (5).................... of the Central Committee of the Lenin Kom-somol. Yuri Gagarin was remembered by the millions of people who saw him, and by the thousands (6).................... knew him. “Gagarin’s name,” wrote Academician Boris Petrov, “will never (7).................... from the history of world civilization.” Yuri Gagarin (8)............... in 1968 in a plane crash and was buried in the Kremlin Wall in Moscow’s Red Square. 1. A. space travel B. spaceflight C. space tour D. space visit 2. A. studied B. trained C. educated D. graduated 3. A. space B. world C. universe D. horizon 4. A. honor B. honorary C. honorable D. honored 5. A. member B. man C. citizen D. person 6. A. men B. people C. which D. who 7. A. erase B. be erasing C. be erased D. erasing 8. A. died B. killed C. was died D. was killed

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