Hỗn hợp gồm 2 axit cacboxylic no, đơn chức kế tiếp nhau trong dãy đồng đẳng của axit axetic. Lấy m gam hỗn hợp cho tác dụng với 150ml dung dịch NaOH 0,1M. Để trung hoà NaOH dư cần phải dùng 50ml dung dịch HCl 0,1M . Dung dịch sau khi đã trung hoà đem cô cạn đến khô thu được 1,0425g hỗn hợp muối khan. a. Viết công thức cấu tạo của 2 axit. Giả sử các phản ứng xảy ra hoàn toàn. b. Tính giá trị của m

Fe $S_{2}$ → $Fe_{2}$ $O_{3}$ → $H_{2}$ $SO_{3}$ ⇄ $FeSO_{4}$ → $Fe(NO_{3})_{2}$ ↓ ↓ Fe → $FeCl_{2}$ → $Fe(OH)_{2}$ → $Fe(NO_{3})_{3}$

helllllllllllllllllllllllllppppppppppppppppp meeeeeeeeeeeeeeeeeeeee 26. Our coach was ......................in a traffic jam and got to Heathrow forty minutes late. A. fastened B. stuck C. fixed D. joined 27. Are you looking forward.........................................on your vacation?. A. you go B. going C. to going D. to go 28. The exam lasts four hours. A. It takes us four hours to take the exam. B. It is a four-hour exam. C. It is a four-hours exam. D. We finish the exam at four o'clock. 29. Bobby: Would you like to go somewhere for a drink ? Mike:………………… A. No, I wouldn’t B. That’s great C. Yes, I can D. It’s not good for me 30. “What do you want to drink?” – “……………” A. A cup of coffee, please. B. I want a comic book. C. No, I don’t like cake. D. I love to go camping.

cho hai hình bình hành ABCD và A'B'C'D' có giao điểm hai đường chéo tương ứng là O và O'. Chứng minh rằng: vectơ AA'+ vectơ BB' + vectơ CC' + vectơ DD'= 4 vectơ OO'

Giải bài 6 câu d,e,f hộ mk nha chỉ câu d,e,f thôi nha

Giúp mình với kết quả của phép lai sau AAaa x AAaa ; AAaa x Aaaa Please

QUESTIONS 21 - 30: Rearrange the words to make a complete sentence. 21. how /that /wondered /to use / they /support service => _____________________________________________________________. (1 Điểm) 23.22. when /the oven /Mai / turn off/ to/ asked her mother => ______________________________________________________________. (1 Điểm) 24.23. could /where /bikes /Phong and Minh /not /park / decide /to/ their => ______________________________________________________________________________. (1 Điểm) 25.24. call /sure /whether /not /he /to /then / was /her => ______________________________________________________. (1 Điểm) 26.25. what /make / they /feel /do /Linh /happier /wondered /to /to => _____________________________________________________________________. (1 Điểm) 27.26. sign/ could/ me/ to/ you/ where/ my name/ tell/ ? => _________________________________________________________ (1 Điểm) 28.27. leave/ when/ no idea/ to/ for/ I / have/ the bus => _____________________________________________________. (1 Điểm) 29.28. hang/ to/ not/ painting/ we/ where/ are/ the/ sure => _________________________________________________________. (1 Điểm) 30.29. go/ they/ can/ who/ first/ not/ decide/ to => _______________________________________________. (1 Điểm) 31.30. how/ tell/ to/ this news/ wondered/ his parents/ to/ he => ________________________________________________________________. (1 Điểm)

Phần 3: phần trc ( phần 2) https://hoidap247.com/cau-hoi/2593634

Giúp em với ạ đúng + vote 5 sao

11. We don't know where we should put the sofa. => _______________________________________________________. (1 Điểm) 13.12. The rules didn't specify who I should speak to in case of an emergency. => _________________________________________________________________________________. (1 Điểm) 14.13. Mai wondered how she could ride the scooter. => __________________________________________________. (1 Điểm) 15.14. Let us decide when we should start the project. => _______________________________________________________. (1 Điểm) 16.15. Could you tell me where I can find a good hotel? => _______________________________________________________? (1 Điểm) 17.16. We must find out what we are to do next. =>___________________________________________________. (1 Điểm) 18.17. A good dictionary tells you how you should pronounce the words. => ___________________________________________________________________________. (1 Điểm) 19.18. We are not sure who we will meet at the entrance. => _________________________________________________________. (1 Điểm) 20.19. I can't remember when I have to turn off the oven. => __________________________________________________________. (1 Điểm) 21.20. Do you know what you should look for? => ______________________________________________? (1 Điểm)