Một hỗn hợp X gồm 2 hidrocacbon A, B (thuộc 1 trong 3 dãy đồng đẳng ankan, anken, ankin), số nguyên tử C trong mỗi phân tử nhỏ hơn 7. A và B được trộn theo tỉ lệ mol 1:2. Đốt cháy hoàn toàn 14,8g hỗn hợp X bằng rồi rồi thu toàn bộ sản phẩm lần lượt dẫn qua bình 1 chủa dd H2SO4 đặc, dư, bình 2 chứa dd Ba(OH)2 thì khối lượng bình 1 tăng 14,4g
a) Xác định dãy đồng đẳng của A, B
b) Xác định CTPT, CTCT của A, B.
Đốt cháy hoàn toàn 0,282g chất hữu cơ A rồi cho các sp sinh ra đi lần lược qua bình đựng CaCl2 khan và bình đựng KOH có dư.Sau thí nghiệm thấy bình đựng CaCl2 khan tăng thêm 0,189g, còn bình đựng KOH tăng thêm 0,8g
Mặt khác ,đốt 0,186g A thì thu được 22,4ml N2 (đktc). Biết phân tử A chỉ chứa 1 ntử N. Tìm CTPT của A
Đốt cháy hoàn toàn 4, 48l (đktc) gồm hai hiđrocacbon cần dùng vừa đủ 11,76l O2 (đktc). Sản phẩm cháy cho hấp thụ hết vào bình đựng dung dịch Ba(OH)2 thu được 29,55 gam kết tủa và một dung dịch có khối lượng giảm 7, 85g
a) Xác định công thức của hai hiđrocacbon trong M.
b) Cho 7,85g M tác dụng với dung dịch AgNO3 trong NH3 dư, phản ứng hoàn toàn thì được bao nhiêu gam kết tủa?
1. outer space / invite / talk / an alien / I / form / If / and / will / my home / I / to / meet / him.
2. who / pilot / report / objects / Kenneth Arnold / experienced / the USA / see / round / an / in / that / nine / he / be / large.
3. tourists / they / Viet Nam / enjoy / Although / abroad / understand / most of / many / not / the festivals / culture / from / in / Vietnamese.
4. suggest / ordinary / with / ones / I / replace / energy - saving / lights / 100 - watts.
5. through / pollute / garbage / be / The river / town / because / pump / a lot of / flow / be / it / our / into.
IV) Read the text and decide which answer best fits each space:
Ruyard Kipling, one of Endland's (26) ______ famous writers, was born in Bombay, India, in 1865, where his English father was working for the British government. Kipling spent his (27) ______ chilhood in India. At six he was to (28) ______ England and educated in an English school. From 1882 until 1883 he was (29) ______ of his school paper. He went back to India in 1883. There he became (30) ______ in writing and worked for a newspaper. When he was 21 he (31) ______ his first book, which was a small book of poetry. Before he was 24 he had brought out a small collection of short stories. There were well-liked and were full of brilliant descriptions and accurate observations.
Between 1887 and 1899 Kipling traveled (32) ______ the world. He visited China, Japan, and he lived for a few years in America, where he married an American woman. Diuring this (33) ______, he wrote several of his most (34) works, the stories for children, which made him famous: The Jungle Books (1894), Kim (1901) and Jusst So Stories (1902). He also published several books of poetry during this time. Kipling returned to England from America and spent the of (35) ______ his life there until his death in 1936.
26. A.such B.most C.extreme D.too
27. A.early B.starting C.young D.beginning
28. A.carried B.transported C.travelled D.taken
29. A.president B.chairman C.editor D.boss
30. A.liked B.interested C.fond D.taken
31. A published B.took out C.invented D.created
32. A.on B.around C.though D.across
33. A.part B.section C.moment D.period
34. A.common B.popular C.usual D.ordinary
35. A.rest B.last C.end D.period
Make up the meaningful sentences using the words and phrases given:
1. Life/ Viet Nam/ year/ 2035/ will/ be/ very/ different/ from/ what/ it/ now/.
2. Participate/ athletics/ provide/ emotion/ and/ social/ benefits/ student/.
3. A/ lot/ energy/ resources/ can/ save/ recycling/.
4. She/ tell/ us/ shut/ door/ but/ not/ lock/ it/ because/ she/ will/ back/ soon/.
5. We/ confident/ that/ future/ be/ our hands/,/ and/ it/ be/ our/ responsible/ contribute/ bettering/ our/ own/ lives/.