hỗn hợp NaI, NaBr hòa tan vào nước được dd A cho thêm Brom vừa đủ vào dd A được muối X có khối lượng nhỏ hơn khối lượng của hỗn hợp muối ban đầu là a gam. Hòa tan X vào nước được dd B, sục khí clo vừa đủ vào dd B, thu được muối Y có khối lượng nhỏ hơn khối lượng muối X là a gam. hãy tính % về khối lượng của các chất trong hỗn hợp muối ban đầu (coi Cl2, Br2, I2 ko phản ứng với nước)

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Exercise 5. Write the second sentence so that it has the same meaning as the first one. Use the word in brackets. 1. I’m leaving now because I don’t want to miss the train. (so) I’m____________________________________________________________________ 2. The last time I saw my uncle was two years ago. (for)  I haven’t_______________________________________________________________ 3. Let me reach my office and then I will talk to him. (when)  I_____________________________________________________________________ 4. Why don’t we donate our old books, toys and clothes to charity? (suggests)  Mom_________________________________________________________________ 5. Jane stayed behind after the class in order to talk to the teacher. (because)  Jane__________________________________________________________________ 6. Where do you live? (address)  What _______________________________________________________________? 7. How old is she? (age) What _______________________________________________________________? 8. What time will it start? (start) When _______________________________________________________________? 9. Mr. Brown is not free this afternoon. (be) Mr. Brown ____________________________________________________________. 10.What does his sister do? (job) What ________________________________________________________________? Exercise 6. Read the passage then answer the questions below: Her name is Linda. She works in a large company in Ho Chi Minh City. She is a secretary. She answers the telephone and takes messages. She also uses a fax machine and a computer. She has to speak English with her boss. She starts work at 8:00. She usually rides her motorbike to work. She has lunch at 12:00. She finishes work at 5:30 pm. She goes home and helps her mother prepare dinner. After dinner she often watches television for a while and reads books. She usually goes to bed at 11:00pm. Questions: 1.Where does Linda work?  ______________________________________________________________ 2. What does she do?  ______________________________________________________________ 3. What language does she speak with her boss?  ______________________________________________________________ 4. Can she use a computer?  ______________________________________________________________ 5. How does she go to work?  ______________________________________________________________