Các bạn làm hộ mình chỉ 5 sao 1 cảm ơn 50 điểm
Tính số gam kali pemanganat KMnO4 cần dùng để có được lượng oxi dùng cho phản ứng trên, biết rằng khi nung nóng 2 mol KMnO4 thì thu được 1 mol O2.
Giúp tớ vs nha mik đang gấp lắm ạ
Giúp mik nhé!! Chọn 1 trong 2 đề thôi ak!! Làm đề nào cũng được !! Mik cảm ơn
1/ Hoàn thành chuỗi phản ứng: KClO3 (1) O2 (2) S (3) H2S (4) S (5) Na2S (1) (2) (3) (4) (5) 2/ Viết 1 phản ứng chứng minh lưu huỳnh là chất oxi hóa và 1 phản ứng chứng minh lưu huỳnh là chất khử.
Tìm m để luôn âm để f(x)=-2x^+2(m-2)x+m-2
Bài1: Sắp xếp các số thập phân thứ tự giảm dần (lớn->bé) A. 4,6; 5,06; 6,05; 8,015 B. 5,7; 6,02; 4,23; 5,3 C. 42,538; 41,835; 42,358; 41,538 D. 6,375; 9,01; 8,72; 6,375; 7,19 E. 0,32; 0,197; 0,4;0,321;0,187 Bài 2 Đổi các số đo sau 5㎝²=……………㎡ 9,5㎝²=……………㎡ 0,69㎝=……………m 0,005㎝²=………………㎡ 45cm2=…………………㎡ 956㎝²=……………………㎡ 7836㎝²=……………………㎡ 78963㎝²=……………………㎡ Giúp em bài 1 vs bài 2 vs ạ em đang cần gấp
My students ……………uniform on Sunday A. wear B. wearing C. to wear D. are wearing We ………..each other for two years. A. have know B. have knew C. knew D. have known 3. Listen! The birds ……………… A. sing B. are sing C. are singing D. singing 4. My father …………..me to the park once a week. A. take B. takes C. is taking D. has taken 5. The children …………….football in the school yard at the moment. A. playing B. are playing C. to play D. is playing 6. Lan is in her room now. She ……………a letter. A. writes B. is writing C. is writing D. is writes 7. Jack……………..no trouble with his English lesson up to now. A. looked B. looks C. has looked D. was looking 8. At present, that author …………….a historical novel. A. are writing B. is writing C. is writing D. is writes 9. Yes, I ……………that other fellow’s name now. A. am remembering B. remember C. remembered D. remembers 10. Rober………….for you since noon. A. has waited B. waits C. is waiting D. have waited 11. I hope that you………….our wedding. A. attend B. will attend C. attended D. attends 12. I’m going to bed. I ………….for hours and I’m tired. A. worked B. have worked C. works D. am working 13. The bees …………….come out of the hivesince six o’clock A. won’t B. hasn’t C. didn’t D. haven’t 14. When I see Barbara in the street, she always ………at me. A. smiled B. has smiled C. was smiling D. smiles 15. “You are late”, he said “I think the bus……………already” A. went B. was going C. has gone D. goes 16. She often ………….thatshe could ride a bicycle. A. wishes B. wished C. wish D. wishing 17. Malee……………at Train Udom at present. A. studies B. is studying C. are studying D. has studies 18. He ……….for the money since last Friday. A. was waiting B. waited C. has waited D. waits 19. “Don’t cook a meal for me”, He said”I’ve already……………” A. eaten B. eat C. eating D. been eating 20. He’s been in Bangkok…….. A. for two weeks B. since two weeks C. in two weeks D. two weeks ago 21. He ………….to his wife an hour ago. A. talks B. has talked C. talking D. talked 22. Harry is working at a bank………… A. at the moment B. since last year C. a year ago D. for a year 23. After having lunch he………to his room to have a short rest yesterday. A. goes B. has gone C. went D. going 24. It’s an hour since he ……………so he must be at the office now. A. is leaving B. was leaving C. has left D. left 25. A clock ……..you the time. A. tells B. told C. is telling D. has told 26. She hasn’t written to me…………. A. already B. yet C. never D. since 27. He……………doing the crossword puzzle in the newspaper every day. A. likes B. liked C. is liking D. has liked 28. The eggs ……….taken to the market once a week. A. is B. are C. was D. were 29. This is the first time I ……..this kind of food. A. eat B. am eating C. has eaten D. have eaten 30. Look! A man …………after the bus. He …………..to catch it A. is running/ is wanting B. is running/ wants C. is running/ want D. runs/ wants 31. My children …………….to the zoo every weekend A. go B. goes C. have gone D. are going 32. It’s ages since Tom …………us. A. has visited B. visited C. visits D. is visited 33. Ann ………..tea vry often. A.doesn’t drink B. don’t drink C. didn’t drink D. hasn’t drink 34. I ………..my son the money for that last week. A. give B. gave C. have given D. had given 35. I ……..lots about the job so far. A. have learnt B. am learning C. had learnt D. learnt 36. Bad driving often …………many accidents A. caused B. cause C. causes D. has caused 37. ………….a car when they were living in London in 1990? A. Have they B. Did they have C. Were they having D. Have they had 38. Ted……….me for weeks. A. hasn’t phoned B. didn’t phone C. isn’t phoning D. phone 39. My brother has enjoyed swimming since he ……………..young. A. has been B. was C. will be D. will be 40. The boys ……football in the field every evening but yesterday they ……….basketball instead. A. played/ played B. played/ play C. play/ played D. play/ play 41. Hurry up, Jane! We all ……………for you. A. wait B. are waiting C. waiting D. are waiting 42. I can’t go with you because I ……..my lessons yet. A. didn’t finish B. am not finishing C. don’t finish D. haven’t finished 43. He …………for Canada two years ago and I ………….him since. A. left/ didn’t see B. has left/ didn’t see C. left/ don’t see D.left/ haven’t seen 44. I…….Nick lately. Ye, he ……………..into an accident 3 weeks ago. Since that time he ……….in hospital. A. didn’t see/got/was B. haven’t see/got/was C. haven’t see/got/ has been D. haven’t seen / has got/ has been 45. It………….this week. A. rained B. has rained C. was raining D. has been having 46. The rain ………….but a strong wind is still blowing. A. stops B. has stopped C. stopped D. is stopping 47.Look! That man ……….to open the door of your car. A. try B. tried C. is trying D. has tried 48. Patricia………….now. Please do not disturb her. A. is sleeping B. was sleeping C. sleeps D. has slept.
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