Hỗn hợp khí X gồm H2 và O2 có tỉ khối so với CH4 là 1,25. 1. Tính khối lượng mỗi khí có trong 5,6 lít hỗn hợp X? 2. Thêm vào 11,2 lít hỗn hợp X 0,5 mol khí CO2 thu được hỗn hợp khí Y. Tính dY/H2? 3. Thêm vào 11,2 lít hỗn hợp X a mol khí He thu được hỗn hợp Z có tỉ khối so với H2 là 6. Tính a?

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II.  Write the correct form or tense of the verbs in brackets. (0,5 x 10 = 5) 1.   At present, the social networks ______________ (become) more popular among young generation. 2.   I ______________ (not listen) to their new CD yet. Is it any good? 3.   When I was a student, I ______________ (not like) doing homework. 4.   Facebook ______________ (found) in 2004 by Mark Zuckerberg and Eduardo Saverin. 5.   The American ______________ (spend) 34 hours a week watching television. 6.   ______________ (you/ ever/ make) origami? 7.   I’ve just bought a new CD of folk songs. I ______________ (listen) to it tonight. 8.   Do you adore ______________ (text) your friends? 9.   Please try ______________ (arrive) punctually at 8.30. 10. Many teenagers prefer ______________ (watch) TV to ______________ (read) books. III. Supply the correct form of the words in brackets. (0,25 x 10 = 2,5) 1.   The Internet is very ______________, it takes up a lot of our time. (addict) 2.   I enjoy ______________ with friends and going out at the weekend. (social) 3.   Sitting in front of the computer too long can cause ______________. (obese) 4.   Are you ______________ about the new Gears Of War games? (excite) 5.   She listens to classical music for ______________. (relax) 6.   The Internet has changed the English language ______________. (consider) 7.   She was ______________ with her job and decided to look for a new one. (satisfy) 8.   Face to face ______________ is better than Skype video calls. (communicate) 9.   You will feel ____________ when you watch a movie at home. (comfort) 10. When you read books, you have to think and ______________. (imagination)