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uyennhi
1 năm trước
Đem 12 lít hỗn hợp X (H2 và Cl2 ) chiếu sáng một lúc thu được hỗn hợp Y trong đó khí HCl chiếm 40% thể tích và khí H2 giảm đi 60% thể tích. tính thành phần thể tích hỗn hợp X và Y biết các khí đo cũng điều kiện nhiệt độ và áp suất.
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I. Choose the correct word A, B or C for each gap to complete the following passage. (1) January 17th, 1995, a powerful earthquake hit the city of Kobe, Japan. Many buildings (2) or collapsed. Soon after the earthquake, people in Kobe (3) working together to save their city. Neighbours pulled each other out (4) collapsed buildings. Ordinary people (5) out fires even before the fire trucks arrived. Volunteers in Kobe organized themselves into (6) . They worked out a system to send (7) to people who needed. Other teams searched for belongings in damaged stores and homes. Some people (8) food, water, clothes, and electric generators to different part of the city. Some volunteers took (9) of children who had lost their parents. Teams of volunteers from outside Japan helped, too. Today, Kobe has been built. But people there still remember the outpouring of support they (10)_______ from all over the world back in 1995. 1. A. in B. at C. on D. from 2. A. is burning B. burned C. burning D. burn 3. A. to begin B. are beginning C. begin D. began 4. A. into B. of C. on D. with 5. A. to put B. putting C. puts D. put 6. A. teams B. pair C. group D. friends 7. A. helped B. helping C. help D. to help 8. A. brought B. bringing C. brings D. brought 9. A. part B. care C. caring D. note 10. A. received B. is receiving C. have received D. receiving

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