a. CuO+H2-to->Cu+H2O(pứ thế)
b. Fe2O3+3H2-to->2Fe+3H2O(pứ thế)
c. H2+1/2O2-to->H2O
d. yH2+FexOy-to->xFe+yH2O (pứ thế)
Giúp mình với Làm hết cho mình nha Cảm ơn
3 phần 4+2 phần 5x=19phần 20 Tìm x
1. That’s the boy. She likes him best. ______________________________________________________________________ 2. That is the book. I bought it yesterday. ______________________________________________________________________ 3. Do you know the boy? He borrows that book. ______________________________________________________________________ 4. The man was very kind. I talked to him yesterday. ______________________________________________________________________ 5. Mary is the girl. She was wearing the most fashionable dress. ______________________________________________________________________ 6. Nam knows the woman. The woman is waiting for us at the station. ______________________________________________________________________ 7. We enjoyed the actors. They played the leading roles. ______________________________________________________________________ 8. That is the sweater. My cousin bought it on Saturday. ______________________________________________________________________ 9. The book was published in 1996. They want it for their reports. ______________________________________________________________________ 10.Where is the book? You’ve just borrowed it from the library. ______________________________________________________________________ 11.He gives me the tickets. He bought them yesterday. ______________________________________________________________________ 12.The student is from China. He sits next to me. ______________________________________________________________________ 13.I am using a sentence. My teacher has explained it in the lesson. ______________________________________________________________________ 14.The people were very nice. We visited them yesterday. ______________________________________________________________________ 15.Students missed the assignments. They were absent from class. ______________________________________________________________________ 16.I have to call my aunt. She has just arrived at the airport. ______________________________________________________________________ 17.The typewriter is big. It is in the principal office. ______________________________________________________________________ 18.The subjects are interesting. We talked about them last week. ______________________________________________________________________ 19.The book was good. I read it. ______________________________________________________________________ 20. I apologized to the women. I spilled her coffee this morning. (whose ) ______________________________________________________________________ 21.Kevin was born on the day . His father was away on that day . ( when ) ______________________________________________________________________ 22.Children usually go to the library . They can find comics in the library. ( where) ______________________________________________________________________
Quangcuong347 giúp e với nhé Viết phương trình phản ứng giữa các chất sau đây: - Buta-1,3-đien và H 2 (dư) - Buta-1,3-đien và HBr theo tỉ lệ mol 1:1 - Isopren và Br 2 theo tỉ lệ mol 1:1
VẼ SƠ ĐỒ TƯ DUY TRÌNH TỰ LẬP LUẬN VĂN BẢN ĐÚC TÍNH GIẢN DỊ CỦA BÁC HỒ VẼ CHO ĐÚNG NHA PHẢI CÓ LUẬN DIỂM RỒI NHIỀU THỨ KHÁC NHA
Giúp mình với mọi người ơi hôm nay nộp rồi
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Chất A là một ankan thể khí. Để đốt cháy hoàn toàn 1,2 lít A cần dùng vừa hết 6 lít O2 lấy ở cùng điều kiện. a. Xác định CTPT chất A b. Cho chất A tác dụng với khí Clo ở 25oC và có ánh sáng. Hỏi có bao nhiêu dẫn xuất monoclo của A? Cho biết tên của các dẫn xuất đó? Dẫn xuất nào thu được nhiều nhất?
2(3m+1)+1/4-2(3m-1)/5+3m+2/10=5
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