Cho 1 ankan X tác dụng với brom theo tỉ lệ mol 1:1 thu được 1 dẫn xuất brom Y. Biết tỉ khối hơi của Y so với không khí là 5,207. A) tìm CTPT của X , B) xác định CTCT đúng và gọi tên ankan X, biết X tác dụng với brom theo tỉ lệ mol 1:1 thu được 3 sản phẩm thế.

Giải b5 e vs ạ E đang cần thấp đến 4h B6 nx thì càng tốt ạ E sẽ tặng 5* cho mn ạ

Làm hộ mình với ạ mình cho 5 sao

Câu 1: Kê tên những cây có hoa sinh sản bằng hình thức sinh dưỡng ( Rễ, thân, lá )để hình thành cây mới. Câu 2: Tại sao nói Việt Nam là nước đa dạng về thực vật? ai làm hộ em vs ạ

4. Complete each of the following sentences using enough as an adjective (before nouns) or adverb (after adjective) with one of the words in the box. strong experience old chairs warm money cups experienced time well room big qualifications Examples: * Bob can’t drive because he is not………………. Bob can’t drive because he is not old enough. * I’d like to go on holiday but I haven’t got……………….. I’d like to go on holiday but I haven’t got enough money. a) There weren’t…………… for everyone to sit down. b) The little boy is not……………… to lift the suitcase. c) Nam didn’t finish the exam because he didn’t have d) Smith didn’t feel ……………. to go to work this morning. e) It ‘s only a small car, so there isn’t ……………. for all of us. f) Do you think I’ve got ……………. to apply for the job. g) Try this jacket on and see if it’s ………………………. for you. h) She couldn’t make coffee for everybody because there weren’t i) He wasn’t…………….. for the job. j) Are you……………. …or shall I switch on the heating? k) Steve didn’t get the job because he didn’t have 5. Fill in each gap in the following sentences with a word from the box. doing meet pleasure introduce allow like before excuse let myself a) May I ________ myself? b) How do you do? I don’t think we’ve met ________ . c) Hello.How are you ________ ? d) Allow me to introduce ________ . My name’s George Mallows, a friend of Sally. e) ________ me, my name is Phuong Dieu Linh. d) I’d like you to ________ Ann Parker. e) ________ me to introduce my teacher, Ms Hoang Nga. f) I’d like you to ______ Ann Parker. g) ________ me to introduce my teacher, Ms Hoang Nga. h) i ‘d ________ to introduce my team leader, Thanh Nam. Hello! Tom,_______________ me introduce my fellow student, Wyne. j) It is great________________ that I introduce my school principal, Mr. Tran Anh.

Giúp mình bài 10 và bài 11 với mn

Câu hỏi dành cho ai giỏi lịch sử lớp 6 có cơ hội được điểm

Cho sơ đồ phản ứng sau: 2Al + 3H2 SO4 → Al2 (SO4 )3 + 3H2 . Nếu nhôm đã phản ứng là 5,4 gam, thì khối lượng Al2 (SO4 )3 thu được là bao nhiêu gam? A: 68,4 gam. B: 40 gam. C: 17,1 gam. D: 34,2 gam.

Tìm n ∈N để $\frac{n^{2}-2n-22 }{n+3}$ là số chính phương (n>0)

I. Choose the best option (A, B, C or D) to complete the following sentences. 1. Find the word whose underlined part is pronounced differently from the others: A.photographed B. laughed C. walked D. saved 2. Choose the word whose main stressed syllable is placed differently from that of the others in each group. A. enjoy B. perform C. study D. direct 3. We go to the ___________ to watch a film. A. stadium B. hospital C. restaurant D. cinema 4. The main _________ is played by Tom Hanks A. character B. director C. actress D. film maker 5. There is a love story in it, and it is very funny. I suppose you call it a _________. A. horror film B. action film C. romantic comedy D. thriller 6. Not many people went to see the film; ______, it received good reviews from critics. A. however B. despite C. but D. although 7. A film that presents actual events is called a __________. A. horror B. thriller C. comedy D. documentary 8. The story is interesting. I am really __________ in it. A. interest B. interested C. interesting D. interestingly 9. The film was so _________ that the two girls next to me couldn’t stop crying. A. moving B. thrilling C. exciting D. fascinating 10. The film was so long, and __________. A. bored B. boring C. bore D. boringly