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2 năm trước
Cho m gam hỗn hợp A gồm Fe2O3 và Cu tác dụng với dd HCl dư, thu được dd B và 1 gam chất rắn chưa tan. Cho dd NaOH dư vào dd B, thu được kết tủa C. Lọc kết tủa C rồi đem nung trong không khí đến khối lượng không đổi thu được 32 gam chất rắn. Xác định m. Biết các phản ứng xảy ra hoàn toàn
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ĐỀ HƠI DÀI GIÚP MÌNH NHA 🤗 ÔN TẬP TIẾNG ANH LỚP 8 MỚI THEO UNIT UNIT 7: POLLUTION Bài tập tiếng Anh Unit 7 lớp 8: Pollution PHONETICS Question I. Find the word which has different sound in the part underlined. (1,25pts) 1. A. watched B. washed C. danced D. played 2. A. goes B. watches C. misses D. brushes 3. A. come B. mother C. open D. some 4. A. mention B. question C. action D. education 5. A. who B. when C. where D. what VOCABURLARY AND GRAMMAR Question I. Choose the best answer. (A,B, C or D) (2pts) 6. I like ______________back my home village on holiday. A. comes B. come C. came D. coming 7. If the factory ________________dumping poison into the lake, all the fish and other aquatic animals will die. A. continues B. to continue C. continued D. will continue 8. Water ________________ in the lake has made the fish die. A. pollution B. pollute C. polluted D. polluting 9. Mi and Nick like ______________back Mi’s home village on holiday. A. comes B. come C. came D. coming 10. If the factory continues dumping poison into the lake, all the fish and other aquatic animals ________________. A. die B. to die C. dead D. will die 11. Water pollution is the ________________ in the lake has made the fish die. A. contaminating B. contaminate C. contaminated D. contamination 12. If we ______________water carefully, more people will have fresh water. A. will use B. would use C. using D. use 13. If the factory continues dumping poison ________________ the lake, all the fish and other aquatic animals will die.\ A. into B. to C. about D. in Question II. Choose the best answer. (A,B, C or D) (1,75pts) 14. Mi and Nick like ______________back Mi’s home village on holiday. A. comes B. come C. came D. coming 15. If the factory ________________dumping poison into the lake, all the fish and other aquatic animals will die. A. continues B. to continue C. continued D. will continue 16. Water ________________ in the lake has made the fish die. A. pollution B. pollute C. polluted D. polluting 17. If the air wasn’t dirty, I ________________ so much. A. wouldn’t sneeze B. sneeze C. would sneeze D. to sneeze 18. If the factory continues dumping poison into the lake, all the fish and other aquatic animals ________________. A. die B. to died C. dead D. will die 19. Water pollution is the ________________ in the lake has made the fish die. A. contaminating B. contaminate C. contaminated D. contamination 20. If I were you, I ______________ that car. A. would buy B. buy C. bought D. buying Conditional Sentence Type I : Câu điều kiện loại 1 Question I. Put the verbs in brackets into the correct form. (2,5pts) (Chia những động từ trong ngoặc đơn vào đúng hình thức). 21. If we (recycle) ________ more, we will help the Earth. 22. Factories (not dump) ______________waste into rivers if the government fine them heavily. 23. If people travel to work by bus, there (be) ______________fewer car fumes. 24. We (save) ________________thousands of trees if we don’t waste paper. 25. If we use water carefully, more people (have) ______________fresh water. Conditional Sentence Type II: Câu điều kiện loại 2 Question III. Put the verbs in brackets into the correct form. (2,5pts) (Chia những động từ trong ngoặc đơn vào đúng hình thức). 26. If I were you, I (look) ________________ for a new place to live. 27. If Lan wasn’t ill, she (join) ________________ out tree planting activity. 28.If there were fewer cars on the road, there (be) ________________ less pollution. 29. If people really cared about the environment, they (not dump) ________________ waste into the lake. 30.If there was no fresh water in the world, what (happen) ________________.

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