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2 năm trước
cân bằng phương trình bằng phương pháp đại số theo sơ đồ phản ứng sau Al+HNO3--->Al(NO3)3+NO+N2O+H2O Mọi người ơi giúp em với
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Câu 2: Hiện tượng nào chứng tỏ trong mẫu thử có khí bay ra là amoniac. A. Giấy quỳ tím hóa đỏ B. Giấy phenolphtalein không chuyển thành màu hồng C. Giấy quỳ tím không đổi màu D. Giấy phenolphtalein không chuyển thành màu trắng Câu 3: Nhiệt phân dãy các muối nào sau đây đều có khí màu nâu đỏ thoát ra? A. KNO3, AgNO3, NH4NO3 B. Zn(NO3)2, Au(NO3)3, (NH4)2CO3 C. Cu(NO3)2, Fe(NO3)3, Zn(NO3)2 D. Zn(NO3)2, Hg(NO3)2, (NH4)3PO4 Câu 4: Phản ứng nào sau đây thuộc phản ứng trao đổi ion? A. NH3 + CuO => N2 + Cu + H2O B. NH3 + O2 => NO + H2O C. HNO3 + FeS => NO + Fe2(SO4)3 + H2O D. (NH4)3PO4 + 3AgNO3 => Ag3PO4 + 3NH4NO3 Câu 5: Dãy nào sau đây chỉ gồm các phân đạm? A. NH4NO3, Ca(NO3)2, (NH4)2CO B. (NH4)2CO, Ca(H2PO4)2, NH4H2PO4 C. NH4NO3, (NH4)2HPO4, CaSO4 D. NH4NO3, Ca3(PO4)2, Na2CO3

bài 2: turn these sentences into clause.(using so that/ in order that) 1/ we hurried to school so as not to be late. ................................................................................. 2/ he climbed the tree in order to get a better view. ......................................................................................... 3/ some young people like to earn their own living in order to be independent of their parents. ........................................................................................................................................................................ 4/ we should do morning exercises so as to improve our health. .......................................................................................................... 5/ I tried to be on time so as not to make our teacher sad. ................................................................................................................. 6/ every people in the world must unite their efforts to maintain and protect peace. .................................................................................................................................... 7/ she put on warm clothes so as not to catch cold. ............................................................................................ 8/ he hurried to the station so as not to miss the train. ..................................................................................... 9/ she locked the door in order not to be disturbed. .............................................................................................. bài 3: turn these sentences into clause. ( using in order to/ so as to/ to) 1/ people use money so that they can buy things they need. (in order to) .............................................................................................................................................. 2/ Banks are developed so that they can keep people's money safe. (in order to) ............................................................................................................................. 3/ I need to buy some laundry detergent so that I will wash my clothes. (in order to) ..................................................................................................................................... 4/ I came to this school so that I could learn english. (in order to) .......................................................................................................................... 5/ Tom was playing very softly so that he wouldn't disturb anyone. (in order not to) ........................................................................................................................... 6/ they rushed into the burning house so that they could save the child. (in order to) ............................................................................................................................................... 7/ Lan often attends English Speaking Club to practice speaking English. (so as to) .......................................................................................................................................... 8/ he stood on the chair to see better. (in order to) ...................................................................................... 9/ please shut the gate for the cows not to get out of the cowshed. (in order to) ............................................................................................................................. 10/ the boy tiptoed into the room not to wake every body up. (so as to) .......................................................................................................................... (giúp mk với mk cần gấp)

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