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nhan2007
2 năm trước
1 Thông thường người ta dùng chất khí X để chữa cháy. ở nhiệt độ cao kim loại Y cháy được trong không khí X tạo ra đơn chất T và hợp chất Z. Biết rằng 3g Y tác dụng với H2SO4 loãng dư thu được 2,8l khí H2 ( đktc ). Tìm công thức các chất X,Y,Z,T 2 Metan và các chất C2H6,C3H8,C4H10,..lập thành dãy chất có công thức chung là CnH2n+2 ( n>=1) Hãy a, Lập công thức chung của dãy chất C2H4,C3H6,C4H8,C5H19,.. và của dãy chất C2H2,C3H4,C4H6,C5H8,... với n là số nguyên tử cacbon. b, Tìm công thức phân tử của X biết X ở trong dãy chất của metan và khối lượng cacbon trong phân tử X chiếm 81,82% c, Tìm khối lượng H2O tạo ra khi đốt cháy hoàn toàn 21,54g hỗn hợp khí Y gồm H2 và 1 số hidrocacbon ở trong dãy chất metan, biết rằng sau phản ứng thu được 31,36l CO2 ( đktc )
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Anh/chị vui lòng trả lời giúp em ạ. Text 1 Read the texts below and choose one correct answer for each question. The Storybook House The classic children’s story “Hansel and Gretel” inspired this unusual home in the U.S. The owners built the house by hand and included five fireplaces inside. The Shoe House This house in the U.S has a living room, two bathrooms, a kitchen, and three bedrooms. There’s even a shoe mailbox. The owner lives there now, but there are tours of the house. The Crazy House People in Vietnam call this house the Crazy House because it looks strange. Part of the house is a tree, and it has unusual twists and turns. You can also see the big animals on the outside. The house is a hotel and a tourist attraction. The Upside-down House In this house in Poland, the furniture hangs from the ceiling! No one lives there, but it’s a popular tourist attraction. It took the workers a long time to build the house. They often felt sick inside. 11. How did the owners build the Storybook House? A. by workers B. By story “Hansel and Gretel” C. by classic children D. By hand 12. How many rooms are there in the Shoe House? A. 4 B. 7 C. 8 D. 6 13. What can you see on the outside of the Crazy House? A. tourist attraction B. Animal C. Tree D. Twists and turns 14. What is unusual about the inside of the Upside-down House? A. The furniture hangs from the ceiling B. It took a long time to build C. It has five fireplaces D. Workers feel sick inside 15. What is the best title for the article? A. Crazy Houses in the United States B. Daily Life in a Strange House C. Unusual Houses From Around the World D. How to Build Your Dream House Text 2 Read the following text and choose the best option for each blank Angel Falls in Southern Venezuela is the world’s highest (16)….. ....fall. Known as Salto Churun Meru in Spanish and as Kerepakupai-Meru by the indigenous people, Angel Falls was discovered by the American aviator Jimmy Angel in 1937 (Cheng). It is located in the Guiana Highlands in Bolivar state on the Churun River. The water (17)…. ......from a height of 979 meters (3,212 feet) and is 150 meters (500 feet) wide at the base. The falls’ height makes it about 20 times higher than the Niagara Falls (Encyclopaedia Britannica). The source of the fall (18)….. ....neither conventional drainage sources such as melting snow, glacier or lakes nor a major river system. Instead, the source is the rainfall from equatorial tropical clouds condensing onto the cloud forest above the plateau of Auyantepui (Cheng). The falls will make a memorable visit for anyone who (19)……..... been awestruck by Niagara Falls; the only (20)….........is that Angel Falls is about twenty times taller and located in a more natural setting. 16) A. air B. water C. weather D. ice 17) A. drops B. drop C. falls D. fall 18) A. is B. are C. am D. ⍉ 19) A. have B. to have C. to has D. has 20) A. different B. differently C. difference D. differ

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