Nêu tính chất hóa học và tính chất vật lí của ankan. Huhuhu.giúp mik.hứa 5sao+cảm ơn+ctlhn.

—-Cho kẽm hòa tan vào 200g dd H,SO4 4,9% al Tính khối lượng axit tham gia phản ứng ? b/ Tính số mol muối tạo thành ? c/ Lấy lượng muối ăn bằng với số mol muối tạo thành ở câu b pha vào nước thu được 6 lít dd muối ăn. Hãy tính nồng độ mol/l của dd muối ăn đó ? - Hướng dẫn: Tính khối lượng H,SO, 4,9% (dựa vào công thức). + Viết PTPƯ xảy ra. + Dựa vào PTPỮ tính câu b. + Dựa vào công thức tính n Axít. - Dựa vào công thức Cm tính được (c)

SO3 CO2 P2O5 Viết CTHH ( kèm tên gọi ) 3 axit ứng với 3 oxit axit trên

Sắp xếp các từ như sau : 1. lwdor ...... ; 2. stirf ...... ; 3. lomed ......

1. He suggested (play)__________football in the schoolyard. 2. His father suggests that he (go) __________to Ha Long Bay this summer vacation. 3. Tom suggested that we (help) __________our mom make cakes. 4. When we went out yesterday, my mom suggested (bring) __________ umbrellas in case it rained. 5. My sister suggests that I (clean) __________my room before my mother comes back. 6. My teacher suggests that all students (finish) __________all homework before class. 7. His friends suggest that he (take) __________ this opportunity to enhance his skills. 8. Her boyfriend suggests (go) __________ to the cinema to relax at the weekend. 9. It’s snowing outside. My brother suggests (make) __________a snowman. 10. To prepare for the test, she suggests (study) __________in the library.

Tìm tất cả các số nguyên x để các phân số sau có giá trị la số nguyênA= x+1/x-2(x khác 2)

Vì sao nói " sức lao động Mới chỉ là khả năng của lao động còn lao động là tiêu dùng sức lao động hiện thực

1. I am sorry that I didn’t finish my homework last night. => I regret................................................................................................................................. 2. Because they made too many mistakes, they failed in the exam. => If................................................................................................................................. => Had..................................................................................................................................... 3. Because he doesn’t leave immediately, I call a policeman. => Were.................................................................................................................................. 4. Today isn’t Sunday, so the pupils can’t go swimming. =>Were................................................................................................................................... 5. They cancelled all flights because of fog. => Had it.................................................................................................................................. 6. The meeting was put off because of pressure of time. => Had it................................................................................................................................. 7. The children couldn’t do swimming because the sea was too rough. => If................................................................................................................................. => Had the sea....................................................................................................................... => Had it.................................................................................................................................. 8. I’m sorry I missed your birthday party. => I wish.................................................................................................................................. => If only............................................................................................................................... 9. I would like the school holidays to be longer. => I wish the school............................................................................................................ => If only................................................................................................................................ 10. If I had been given fair warning, I would have avoided that date. => Had................................................................................................................................... 11. Please don’t say things like that. => I wish you............................................................................................................................. 12. It would have been a superb weekend if it hadn’t been for the weather. => But for................................................................................................................................... 13. It is a pity you didn’t tell us about this. => I wish...................................................................................................................................... 14. I haven’t much money, I can’t buy any new clothes. => If................................................................................................................................. => Were....................................................................................................................................... 15. I am sorry that I didn’t study French last year. => I wish...................................................................................................................................... 16. The weather forecast was inaccurate so we didn’t take the right precaution. => Had............................................................................................................................................ 17. The temparature didn’t fall below zero so the crops weren’t damaged. => Had............................................................................................................................................ 19. Mary didn’t work hard enough. She failed in the exam. => Had............................................................................................................................................. 20. He is sorry now that he didn’t invite Mary to his party. => If only........................................................................................................................................

mình đag cần rất rất gấp. mọi ng giúp mình vớiiii akkk. mình sẽ tick cho ai lm nhanh nhất và sẽ vote 5sao, ctrlhn

máu ở tĩnh mạch giàu oix hay nghèo oxi giải thích