Hoà tan hoàn toàn 8,3g hỗn hợp X gầm Al,Fe bằng lượng vừa đủ dd HCl 7,3% kết thúc phản ứng thu được dd Y và giải phóng 5.6l H2(đktc) a)Viết PTHH B) Tính % khối lượng kim loại trong hỗn hợp x c)Tính m dd HCl đã dùng d)Tính nồng độ % các chất tan trong dd Y

Hoà tan hoàn toàn 16g CuO vào dung dịch H2SO4 20% được dung dịch X a) Viết PTHH b)tính m dung dịch H2SO4 đã dùng c)Tính C% dung dịch X

Người ta dùng 1 mặt phẳng nghiêng có chiều dài 3m để kéo một vật có khối lượng 300kg với Fk=1200N.Hỏi vật đó có thể lên cao bao nhiêu biết hiệu suất mặt phẳng nghiêng là 80%

1You/can/the way/the nearest post office/tell me/to 2Manchester/the friendliest/is/in England/city. 3Why/so hard/does she/ every day/have to work 4What/computer/helpful! 5the Taj MaHel/the most beautiful building/the world/is/in 6We/walk to/can/ the supermarket

We have to keep all _______________________ things out of children’s reach. (DANGER) 2. The tiger wanted to see the farmer’s ________________________. (WISE) 3. Jane talks about her family ________________________. (PRIDE) 4. Do you know how to __________________________ this word? (PRONUNCIATION) 5. How do people organize these _____________________? (ACT) 6. No one likes him because he is _______________________. (FRIEND) 7. Her _________________________________ makes him surprised. (PRONOUNCE) 8. We will interview only 2 ________________________________ for the job. (APPLY) 9. I like the_____________ atmosphere of the country. (PEACE) 10. She recived a lot of ________________________________ from her parents. (ENCOURAGE)

1. usually underline/ only the words they/ or highlight/ want to learn/ Students. →Students ___________________________________________________________ 2. promised/ Tim/ to try/ in learning/ his best/ Spanish. → Tim ______________________________________________________________ 3. magazine / is / as / as/ not / newspaper / large / is / the / the . →________________________________________________________________________ 4. company / twenty / worked / father / years / for / for / my / has / this . →______________________________________________________________ 5. deaf-mutes/ at Boston University/ with/ in America/ worked/ he →______________________________________________________________ 6. in the last semester / Peter / was not good / but his result / studied very hard →_____________________________________________________________ 7. ought to / You /after school / the housework / help / your Mom / with /./ →You _________________________________________________________ 8. is taken from /Wood / making things /trees and used for / building and /./ →Wood _____________________________________________________________ 9. was young / , / stay at home by herself /. / when she / she used to →_______________________________________________________ 10. Alexander Graham Bell / the telephone / in 1876 / invented /./ →___________________________________________________________________________

1. We have to keep all _______________________ things out of children’s reach. (DANGER) 2. The tiger wanted to see the farmer’s ________________________. (WISE) 3. Jane talks about her family ________________________. (PRIDE) 4. Do you know how to __________________________ this word? (PRONUNCIATION) 5. How do people organize these _____________________? (ACT) 6. No one likes him because he is _______________________. (FRIEND) 7. Her _________________________________ makes him surprised. (PRONOUNCE) 8. We will interview only 2 ________________________________ for the job. (APPLY) 9. I like the_____________ atmosphere of the country. (PEACE) 10. She recived a lot of ________________________________ from her parents. (ENCOURAGE)