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quynhhuong2002
2 năm trước
1.Cho các PƯHH sau: a.Cu(OH)2 --t°--> CuO+H2O b.S + Oe --t°--> SO2 (dấu mũi tên lên) c.2KNO3 --t°--> 2KNO3+O2 (dấu mũi tên lên) d.2HgO --t°--> 2Hg+O2 (dấu mũi tên lên) e.Fe+2HCL ----> FeCl2+H2 (dấu mũi tên lên) -PƯHH nào thuộc loại PƯ phân hủy? -PƯHH nào thuộc loại PƯ hóa hợp 2.Từ những hóa chất cho sănz KMnO4,P.Viết PTHH để điều chế P2O5 3.Đốt cháy sắt trong oxi ở nhiệt độ cao thu đc oxit sắt từ a.Tính sô gam sắt và thể tích khí oxi (đktc) cần dùng để điều chế 6,96 gam oxit từ sắt từ b.Tính số gam KCIO3 cần dùng để điều chế lượng khí oxi dùng cho phản ứng trên
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PRACTICE 3. Directions: Write the past participles of the verbs. The list contains both regular and irregular verbs. Simple Form Simple Past(PI) Past Participle (PII) Simple Form Simple Past Past Participle (PII) 1. bring Brought brought 14. play played played 2. build built built 15. read read* read 3. buy Bought bought 16. save saved saved 4. eat Ate eaten 17. send sent sent 5. plan Planned planned 18. speak spoke spoken 6. give gave given 19. spend spent spent 7. grow grew grown 20. take took taken 8. hit Hit hit 21. teach taught taught 9. hurt hurt hurt 22. go went gone 10. leave left left 23. visit visited visited 11. lose lost lost 24. wear wore worn 12. make made made 25. write wrote written 13. find found found 26. do did done PRACTICE 4. Directions: Use the given form of be (was, is, going to be, etc.) and complete the sentences with the past participles of any verbs in the list in Practice 3. 1. was There's no more candy. All the candy _____________ by the children. 2. is Arabic ______________ by the people of Syria and Iraq. 3. are Books ______________ by authors. 4. was My friend ______________ in an accident. He broke his nose. 5. is going to be Bombay, India, ______________ by thousands of tourists this year. 6. has been Wilr and Peace is a famous book. It _____was__ by millions of people. 7. will be The championship game ___will be___________in Milan next week. 8. can be Everyone ______________to read. I'll teach you if you'd like. 9. are going to be Our pictures ______________ by a professional photographer at the wedding. 10. have been Oranges ______________ by farmers in Jordan since ancient times. 11. is Special fire-resistant clothing ______________ by firefighters. 12. will be A new bridge across the White River ______________ by the city government next year.

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