Hàm lượng lưu huỳnh trong một mẫu dầu hỏa được xác định bằng cách đốt 4,476g mẫu trong lò. Sản phẩm đốt được đem dẫn vào dung dịch H2O2 3%. Khí SO2 cho PỨ: SO2 + H2O2 -> H2SO4. Người ta thêm vào phản ứng 25 ml dd NaOH 0,00923 M. Lượng NaOH dư đã PỨ hết với 13,33 ml dd HCl 0,01007 M. Tính % Lưu huỳnh trong mẫu.

Tim các số nguyên x;y biết: (x+3)(y-5)= 15 Giúp mik với nha các bạn

1. Although there was a traffic jam, we managed to arrive at the train station on time. ……………………………………………………………………………………. (despite) 2. I don’t want to buy a new computer although I have enough money. (having) ……………………………………………………………………………………. 3. Both of them usually go to school late although they don’t live far from school. (spite) ……………………………………………………………………………………. 4. My brother still went to school yesterday although he was sick. (sickness) ……………………………………………………………………………………. 5. Although he looks healthy, he has a weak heart. (looking) ……………………………………………………………………………………. 6. Despite the fact that Louis is not so rich, he often does charity. (although) ……………………………………………………………………………………. 7. In spite of the awful weather, we enjoyed our party last night. (although) …………………………………………………………………………………. 8. She goes shopping every week although she has many clothes. (having) …………………………………………………………………………………….

I. Choose the words whose underlined part is pronounced differently from that of the others in each group. 1. A. bed B. setting C. decide D. get 2. A. easy B. eat C. learn D. tea 3. A. sit B. in C. if D. fine 4. A. child B. watch C. chin D. school 5. A. come B. no C. open D. home 6. A. theater B. there C. through D. three 7. A. brother B. breath C. either D. clothes 8. A. clip B. give C. twice D. stupid 9. A. favorite B. animal C. channel D. programme 10. A. studio B. documentary C. cute D. industry 11. A. when B. where C. best D. detective 12. A. weather B. newsreader C. teaching D. repeat 13. A. clumsy B. cute C. but D. just 14. A. earth B. thanks C. feather D. theater 15. A. the B. think C. with D. they 16. A. something B. theatre C. neither D. monthly 17. A. other B. thinking C. healthy D. birthday 18. A. Thailand B. weatherman C. anything D. Thanksgiving 19. A. earth B. through C. both D. there 20. A. growth B. three C. feather D. thing 21. A. this B. think C. thank D. thieves 22. A. gather B. bathe C. birthday D. weather 23. A. tooth B. breathe C. through D. earth 24. A. thirty B. than C. therefore D. those 25. A. mouth B. Thursday C. nothing D. worthy 26. A. both B. teeth C. smooth D. fourth 27. A. weather B. wealthy C. clothing D. bathing 28. A. though B. thank C. throw D. thin 29. A. southern B. neither C. thus D. third 30. A. author B. those C. width D. think 31. A. thin B. than C. they D. there 32. A. birthday B. earth C. worth D. there 33. A. another B. death C. brother D. though 34. A. thank B. mother C. thunder D. throat Page | 2 35. A. they B. three C. thirst D. thread 36. A. worth B. thick C. though D. wrath 37. A. Thursday B. than C. there D. those 38. A. Thursday B. thanks C. these D. birthday 39. A. thought B. without C. theater D. tooth 40. A. weather B. wealthy C. clothing D. bathing 41. A. thirsty B. both C. Thanksgiving D. there 42. A. weather B. through C. warmth D. tooth 43. A. than B. their C. earth D. then 44. A. birthday B. although C. thing D. theatre 45. A. anything B. neither C. than D. feather 46. A. think B. thought C. theatre D. there 47. A. mother B. through C. leather D. either 48. A. them B. they C. something D. this 49. A. thirty B. though C. fifth D. thanks 50. A. everything B. brother C. theory D. both

Trình bày cấu tạo của tim? Mấy loại mạch máu, phân biệt sự khác nhau giữa 3 loại mạch

mọi người giúp em với cho ΔABC nhọn (AB<AC), 3 đường cao AD,BE,CF cắt nhau tại H a, C/m:ΔBCF đồng dạng ΔBAD b, C/m:ΔBDF đồng dạng ΔBAC c, HA.HD=HB.HE

Bài 1: chia động từ trong ngoặc: 36. You...........(have) no trouble at school if you had done your homework 37. If you............(swim) in this lake, you'll shiver from cold 38. The door will unlock if you..............(press) the green button 39. If Mel.............(ask) her teacher, he'd have answered her questions 40. I..............(call) the office if I were you 41. If we..............(send) an invitation, our friends..............(to come) to our party 42. He..............(not understand) you if you (whisper)................ 43. They...............(not survive)in the desert if they..............(not take) extra water with them 44. If you................(press) CTRL + s, you..............(save) the file 45. You..............(cross) the Channel if you..............(fly) from Paris to London 46. Fred...............(answer) the phone if his wife have a bath 47. If Claire................(wear) this dress at the party, our guests.................(not stay) any longer 48. If I................(touth) this snake, my girlfriend................(not scream) 49. She...............(forget) to pick you up if you...............(not phone)her 50. I.................(remember) you if you................(give) me a photo

viết một bài văn 1000 từ về những việc làm mà nhà nước ta đã làm để phòng dịch corona

Chỉ mình 3 bài đi Tuy điểm mình ko cân đối nhưng mai mình nộp rồi Mình chỉ còn 10 điềm à Mong các bạn giúp 3 bài nhoa Đừng giải 1 bài hay 2 bài nhoa Còn 3 bài khó à

Giúp em câu 1 với ạ. Câu 1 thôi ạ