Tiến hành 2 thí nghiệm: Thí nghiệm 1: Cho a gam Fe hòa tan trong 300 ml dung dịch HCl CM; cô cạn hỗn hợp sau phản ứng ta được 24,65 gam chất rắn. Thí nghiệm 2: Cho a gam Fe và b gam Mg hòa tan trong 300 ml dung dịch HCl CM ; cô cạn hỗn hợp sau phản ứng ta thu được 52,45 gam chất rắn và 3,36 lít khí H2 ( đktc). Tính a, b và C. Biết các phản ứng xảy ra hoàn toàn

Viết phương trình điện li 1. H2CO3 2. HBrO4 3. Pb( OH)2 4. Bi( OH)3 5. Cr( OH)3 6. Be( OH)2 7. KH2SO4 8. Fe( HCO3)2

1. If I had finish a course on computer programming, I would have a better salary now. A​​ B​​ C​​ D 2. If we had more time last week, we would certainly have finished the project on time. ​ A​​​​ B​​ C D 3. Were you to win a huge sum of money, what would you have bought? ​​ A​​ B​​ C​​​ D 4. If they took their language lessons seriously, they would be able to communicate with the locals now. A​​​​​​ B​​​​ C ​ D 5. The guests could have had their lunch outside if it weren’t so cold. ​​​​ A​​B​ C D 6. What would you have done five years ago if you won a million dollars? ​​​ A​​ B ​ C D 7. If I had eaten lunch, I wouldn’t have been hungry now. A ​ ​B C​​ D 8. Unless I don’t go home early, please go shopping and buy some food for lunch. ​​A​​ B​​ C​​​ D 10. Had I been interested in that subject, I would try to learn more about it. A​​ B​​ C​​ D Em cần gấp !!

giải giúp mk vs ạ, mk đang cần gấp

ở người thường thận thải ra bao nhiêu phần trăm nước tiểu

If I…………..to the store later, I’ll get you some milk. A. will go​​B. went​​​C. go​​​D. was going 2. If I’m tired in evenings,………….. A. I went to bed early​​B. I go to bed early C. I’d go to bed early​​D. I’d have gone to bed early 3. Don’t forget to ring me up if…………..any changes in the timetable. A. they are ​​B. it will be​​​C. there are ​​D. there will be 4. If you…………..very tired, shall we go to the concert tonight? A. didn’t feel ​​B. aren’t feeling ​​C. won’t feel ​​D. hadn’t felt 5. As a rule you shouldn’t argue with your hosts unless they…………..something openly offensive. A. had said ​​B. will say ​​​C. have said ​​D. would say 6. If I…………..hear from Nigel, I’ll tell him you were asking after him. A. happened ​​B. should happen to ​​C. should to​​D. will happen to 7. Study harder…………... A. if you will pass the exam​​B. and you pass the exam C. unless you pass the exam​​D. or you won’t pass the exam 8. If services are increased, taxes…………... A. probably go up​B. will probably go up​C. probably went up​D. going up probably 9. What…………...if there​…………...a serious nuclear accident? A. will happen – was​​B. happens - were C. would happen – were​D. would happen - had been 10. If all the ice in glaciers and ice sheets…………, the sea level…………...by about 80 meters. A. were melted - can rise​​B. has melted - has risen . C. melts - could have risen​​D. melted - would rise 11. If some endangered species…………….in zoos, it…………….to ensure their future survival. A. had been kept – helped​​B. will be kept - has helped C. are kept - could have been​​D. were kept - would help 12. If I were you, I…………….a car and have a look around the country. A. hired​​B. will hire ​​​C. would hire ​​D. could have hired 13. “What is the matter with Tim and Sarah?” “They said that if the business continued to do so badly they……………sell the house.” A. had to​​B. would have ​​C. would have to ​D. would be 14. “Are you going to buy it or not?” “If it……………so expensive, I would.” A. were​​B. weren’t ​​​C. hadn’t been ​D. isn’t 15. “Why do you have to get a train to work?” “If I didn’t live so far away, I ……………to.” A. wouldn’t have ​​B. didn’t have ​​C. hadn’t had ​​D. wouldn’t have had 16. “Why don’t we ask Michael to chair the meeting?” “Suppose……………to ask him, do you think he would accept?” A. were we ​​B. we were ​​​C. we had been ​D. had we been 17. If I could speak Spanish, I……………next year studying in Mexico. A. will spend​​​B. had spent​​C. would spend​D. would have spent 18.……………so aggressive, we’d get on much better. A. She was not​B. Had she not​​​C. Were not she​D. If she weren’t 19.I……… down your number if I……………right now. Can you call me back in half an hour? A. could be writing - am not driving ​​B. would write - weren’t driving C. were writing - wouldn’t drive ​​D. had written - hadn’t been driving 20. I don’t know you were asleep. Otherwise, I……………so much noise when I came in. A. didn’t make​B. wouldn’t have made​C. won’t make​​D. don’t make 21.I​took a taxi to the hotel but the traffic was very heavy. It…………quicker if I…………… A. would be - walked​​​B. would be - had walked C. would have been - had walked​D. was - walked 22. “I. thought you’d get here much earlier.” “I know. We……………it without our flight…………… almost two hours late.” A. could make - taking off​​B. would have made - took it off C. must have made - taking off​D. could have made - taking off 23.……………to the last Christmas party, she……………, but nobody invited her. A. Had she been invited - would have come​​B. If she had been invited - would come C. If she had invited - would come​​​D. Had she invited - would have come 24. If he had tried his best, he……………accepted to that university. A. would have​​B. would have been​​C. would be​​D. would had been 25.I​would have cooked something special if I……………you were coming. A. knew​​B. know​​​C. have known ​D. had known 26. The French hikers who were lost in. a jungle……………for seven weeks if they……………turtle meat and river water. A. wouldn’t survive - hadn’t been consuming​B. aren’t able to survive- didn’t consume C. couldn’t have survived - hadn’t consumed​D. didn’t survive - wouldn’t be consuming 27. If I ……………you were going to the post office, I would have asked you to buy me some stamps. A. knew​​B. have known ​​C. had known ​​D. know 28. Susan would never have talked to you again if you……………. A. didn’t apologize​​B. hadn’t apologized​C. wouldn’t have apologized ​D. haven’t apologized 29. If we…………….the flight, our holidays wouldn’t have been spoilt. A. hadn’t missed ​B. didn’t miss ​​​C. haven’t missed ​D. don’t miss 30. You should be very glad that John didn’t recognize you that night. Can you imagine his anger if he…? A. had​​​B. did​​​​C. did not ​​D. would have Giúp em với ạ !!

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Biết rằng cứ 5 gói kẹo như nhau thì đếm được 40 viên. Hỏi muốn chia cho 36 em thiếu nhi , mỗi em 6 viên kẹo thì phải mua tất cả bao nhiêu gói kẹo?

Làm giúp mình nhé, không cần làm câu g. Thank 👍

các bạn nhớ giải thích giùm mình nhé . Phải GIẢI THÍCH vì sao chon đáp án đó nha