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Hòa tấn 12,5 (g) tinh thể cuso4 . 5h20 trong nước thành 200ml dd . Tính nồng độ Mol các ion trong dung dịch thu được

một nguyên tử r có tổng số hạt là 115 số hạt mang điện tích nhiều hơn số hạt ko mang điện tích là 25 hạt tính nguyên tử khối của r

Mong hiền nhân MinhDuc2k7 vô đây giúp đỡ ( Mod ơi đừng xóa ạ, mong lắm bởi vì nếu ko xong bài này cô chửi chết và viết `1` bài văn dài và gửi cho bố mẹ em )

Giúp mình với!! (x/3+3/x)³ Cái này là hằng đẳng thức ạ

11. "What time ___________ for work every morning?" "At 6:30." A. have you left B. had you left C. do you leave D. did you leave 12. I wasn't thirsty because I ________ some milk. A. drunk B. have just drunk C. just drank D. had just drunk 13. Who ________________ the car at time of the accident? A. was driving B. is driving C. drove D. has driven 14. After having a bath, he ________ his supper. A. had eaten B. ate C. has eaten D. was eating 15. The phone ________ suddenly when Joanne was doing the housework. A. rang B. ringing C. has rung D. is ringing 16. It ________ as we drove slowly along the road. A. has snowed B. had snowed C. was snowing D. is snowing 17. He couldn’t remember what ___________________ to him the day before. A. happened B. was happening C. has happened D. had happened 18. You can't meet the director now. He __________ with someone. A. talks B. was talking C. is talking D. talked 19. My sister ________ married in January, 2002. A. has got B. got C. was getting D. had got 20. Anita _________ very hard at the moment. A. is studying B. studies C. studied D. has studied

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đốt cháy hoàn toàn 4,5g một este đơn chức X thu được 3.36l khí CO2 (đktc) và 2,7g H2O. Công thức phân tử của X là?

GIẢI HỘ MIK VỚI!!! IV. Supply the correct form of the words in brackets. 1. The union represents people who work in the (entertain) ___________________ industry. 2. Games can make learning more (enjoy) ___________________. 3. Both their children had dual (nation) ___________________. 4. The managers were busy with (prepare) ___________________ for the conference. 5. We cannot use these descriptions of (biology) ___________________ functioning. 6. Students in both schools achieved (similar) ___________________ low scores on the test. V. Rewrite the sentences as directed. 1. Doing yoga is new to me. → I have___________________________________________________ 2. You need to get your hair cut. (needs) → Your_________________________________________________________________________ 3. Joe was tall, dark, and handsome. (make a question about the underlined part) → _________________________________________________________________________________ 4. She wishes she had bought that old house. → She regrets________________________________________________________________________ 5. The boss won’t let us go to the factory late. → The boss won’t allow________________________________________________________________ 6. During my dinner, the phone rang. → While _________________________________________________________________________

Mn giúp mik giải hết với 7 giải theo đẳng cấp bật 2