Ai jup mik vs mik đang cần gấp Bài 1: Bằng phương pháp hóa học hãy phân biệt các chất khí: C2H2, CH4, C2H4. (viết phản ứng hóa học xảy ra nếu có).

Bài 1: Viết PTHH xảy ra khi đốt lần lượt các chất sau trong khí Oxi: K; S; Zn; P; Ca; Fe; C; Zn; CH4; C2H6O; C4H10; C3H8O; C4H8O?

giúp mình với,mình đang cần gấp ,cảm ơn trc ạ.

Giúp mik nhà mn . Cảm ơn mm rát chi là nhiều nè 🙂🙂

Cho tam giác ABC vuông tại A, biết AB = 3cm , BC = 5 cm. Tính diện tích tam giác ABC.

. Đốt cháy 6,2 g phot pho (P) trong khí oxi , thu được 35,5 g điphotpho penta oxit ( P2O5 ) . Khối lượng khí oxi tham gia phản ứng là a 16g b 32g c 29,3g d41,7g

Chia độngtừtrongngoặcsaochothíchhợp. 1. Where’s Mary? She (listen) __________________ to a new CD in her room. 2. Don’t forget to take your umbrella with you today. You know it (be) _____________ the raining season now. 3. Jean always (learn) __________ English at this time every day but today she (not study) _______ at the moment. 4. What time _____________ (the meeting/ happen) tomorrow? I (not know) ___________________ it yet. I (wait) _________________ for the announcement. 5. Where _______ (you/live) since you moved from your old house? 6. Look! The sun (rise) __________ over the ocean. This is the most amazing scene I (ever/ see) ______________. 7. He (speak) _________ Japanese so well because He (come) ___________ from Japan. 8. ________ (you/ usually/ go) for Christmas or _________ (you/stay) at home? 9. Look! Your friend (hold) ___________ some roses. They (look) ____________ lovely. 10. _____________ (you/ finish) your assignment yet? No, I ________________. 11. My father usually (walk) __________ to work but now hw (drive) __________________ his car. 12. I (not think) _________ Mary (sleep) __________ because I can hear some noise from her room. 13. My grandparents (bring) ____________ me up since I was very small. 14. How long ____________ (Peter/ work) in his firm? 15. James (always/ complain) __________. It (be) ________ hard to please him. 16. I (just/ realize) _______ that there are only four weeks to the end of them. 17. This is the second time I (be) _____ to London. 18. Now the children (not want) _______ to go to sleep. They (prefer) ___________ their mother to tell them bedtime stories. 19. _____ (they. Want) a horror movie before? Yes, they (watch) __________ a plenty of such movies before. 20. Jim (cook) __________ so tired now. He (work) ______________________ non-stop since the morning.

cho độ dài hai đáy của một hình thang là 2,3 dm và 4 dm chiều cao là 3,2 dm diện tích hình thang là

Chứng minh rằng: abc deg chia hết cho 37 khi abc cộng deg chia hết cho 37

Giúp mk câu 5 với ạ. Mk cảm ơn.