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duongphung22001
2 năm trước
Câu 4. (2,5đ) Cho 17,7 gam hỗn hợp bột gồm kim loại sắt và kẽm vào dung dịch CuSO4 dư. Sau khi phản ứng xảy ra hoàn toàn thu được chất rắn có khối lượng 19,2 gam . Tính thành phần phần trăm theo khối lượng của mỗi kim loại trong hỗn hợp ban đầu .
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II. PRACTISE EXERCISES: Mark the letter A, B, C, or D to indicate the word whose underlined part differs from other three in pronunciation in each of the following questions. 1. A. prefer B. better C. teacher D. worker 2. A. bear B. hear C. dear D. near 3. A. collect B. concern C. concert D. combine 4. A. absent B. government C. dependent D. enjoy 5. A. future B. return C. picture D. culture 6. A. bird B. girl C. first D. sister 7. A. burn B. sun C. hurt D. turn 8. A. neighbor B. favorite C. culture D. tourist 9. A. traffic B. pavement C. plane D. station 10. A. railway B. mail C. sail D. captain 11. A. nearest B. head C. bread D. health 12. A. came B. lake C. station D. start 13. A. ancient B. radio C. village D. nature 14. A. break B. head C. bread D. heavy 15. A. jam B. narrow C. carry D. danger 16. A. means B. seatbelt C. great D. teacher 17. A. record B. vehicle C. lesson D. zebra 18. A. lane B. stay C. traffic D. wait 19. A. cycle B. bicycle C. fly D. skyscraper 20. A. park B. pavement C. plane D. safety 21. A. loved B. liked C. wished D. gripped 22. A. bored B. amazed C. excited D. enjoyed 23. A. filled B. opened C. played D. wanted 24. A. ended B. shocked C. laughed D. missed 25. A. talked B. needed C. cooked D. booked 26. A. terrified B. entertained C. produced D. engaged 27. A. reversed B. walked C. stopped D. obeyed 28. A. escaped B. liked C. decided D. washed 29. A. moved B. gripped C. remembered D. encouraged 30. A. matched B. dressed C. started D. decreased 31. A. excited B. annoyed C. bored D. terrified 32. A. borrowed B. explained C. tried D. succeeded 33. A. disappointed B. interested C. laughed D. fascinated 34. A. washed B. wanted C. stopped D. looked 35. A. filled B. stayed C. washed D. danced 36. A. picked B. promised C. delivered D. clicked 37. A. naked B. talked C. walked D. booked 38. A. confused B. shocked C. bored D. depressed 39. A. terrified B. concerned C. satisfied D. exhausted 40. A. pleased B. interested C. bored D. amused Mark the letter A, B, C or D to indicate the word that differs from the other three in the position of primary stress in each of the following question. 41. A. happen B. enter C. award D. ridden 42. A. culture B. parade C. weather D. cannon 43. A. receive B. finish C. direct D. complete 44. A. visit B. famous C. wonder D. protect 45. A. critic B. event C. machine D. mistake 46. A. carnival B. festival C. holiday D. Halloween 47. A. enjoy B. special C. culture D. worship 48. A. wonderful B. performer C. seasonal D. celebrate 49. A. lantern B. costume C. parade D. stuffing 50. A. creative B. religious C. musician D. romantic

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