a,
$Mg+2HCl\to MgCl_2+H_2$
$2Al+6HCl\to 2AlCl_3+3H_2$
$Fe+2HCl\to FeCl_2+H_2$
$Zn+2HCl\to ZnCl_2+H_2$
b,
Gọi $x$ là số mol $H_2$
Theo PTHH, $n_{HCl}=2n_{H_2}=2x(mol)$
Bảo toàn khối lượng:
$13,5+36,5.2x=66,75+2x$
$\to x=0,75$
$\to V=0,75.22,4=16,8l$
mod ,biệt đội hăng hái ,các bạn học giỏi ,chuyên gia ....giúp em câu 13 với .
giá vé xem phim là 100000\ vé , sau khi giảm giá vé , số khán giả tăng 25%nên doanh thu tăng 10% , vậy giá vé sau giảm là ? chỉ cần Đ/S thôi ạ, ko cần giải.
Tại sao bộ máy nhà nước thời Lê Thánh Tông có tổ chức hoàn chỉnh, chặt chẽ hơn bộ máy nhà nước thời Lý – Trần? ngắn 10 dòng=câu trlhn dài hơn 10 dòng= 1 sao giúp mik nha!
Supply the correct verb forms: 1. I would rather (stay) _________ home tonight 2. Mr. Timmy would rather (stay) _________ home last night 3. We would rather (drink) _________ tea than coffee 4. The photographer would rather that we (stand) _________ closer together than we are standing 5. Camila would rather (cook) _________ for her family 6. She would rather you (not arrive) _________ yesterday 7. Jim would rather his friends (sleep) _________ than worked last night 8. Sam would rather Jill (be) _________ here with her tomorrow 9. I would rather my brother (not fail) _________ the driving test yesterday 10. I would rather that you (invite) _________ her to your party last Sunday 11. I would rather you (stay) __________ in a hostel than in a hotel. 12. I would rather you (find) __________ a job. 13. He would rather (face) ___________ the enemy than surrender. 14. They would rather (build) _____________ a new house than repair the old one. 15. We would rather you (go) _________ to bed now. 16. We would rather you (do) __________ the work yourself. 17. I would rather you (go) _____________ home now. 18. I’d rather (be) ____________ a vampire than a zombie. 19. I’d rather you (tell) __________ the truth. 20. Would you rather we (not go) __________ out tonight?
Giúp em với ạ:33(hứa vote+cảm ơn)
VI. Chọn đáp án đúng 1. John would rather ______________ free tomorrow. a. is b. was c. be d. will be 2. I would rather he ______________ her to his birthday party last Sunday. a. have invited b. had invited c. invited d. would invite 3. I’d rather you ______________ me now. a. had paid b. is paying c. paid d. pay 4. Peter would rather ______________ on a mattress than on the floor. a. to sleep b. sleeping c. sleep d. have slept 5. Did you go to the concert last night? ~ Yes, but I’d rather ______________ to the concert. a. not go b. haven’t gone c. not have gone d. not had gone VII. BÀI TẬP LUYỆN TẬP CẤU TRÚC WOULD RATHER 1. Bài tập 1. I would like you to come here now. ....................................................................................... 2. I would prefer to travel in July rather than in November. ............................................................................................ 3. I prefer drinking water rather than eating something. ............................................................................................................................ 4. I prefer to dance rather than sing ....................................................................................... 5. I want you to stay at home rather than on a trip ....................................................................................... 6. I would like you to find a job. ....................................................................................... 7. He would face the enemy rather than surrender. ....................................................................................... 8. They would like to buy a new car instead of repairing the old one. ........................................................................................................................ 9. We would like you to go bed now. ....................................................................................... 10. We would like you to go with us .......................................................................................
V. Hoàn thành các câu dưới đây với các gợi ý cho sẵn be an engineer study Chinese not go out stay home lie on the beach not tell you go to an opera go out with their friends … stay home with their parents 1. I went to the movies last night. I prefer opera to movies. I would rather ______________. 2. I studied French when I was in high school only because my parents wanted me to. I would rather ______________. 3. Jack’s parents want him to become a doctor, but he’d rather ______________. 4. I know you want to know, but I’d rather ______________. I told Marge that I’d keep it a secret. 5. Sometimes teenagers would rather ______________ than ______________. 6. I would rather ______________ right after dinner at the restaurant last night, but my friends insisted on going to the cinema. 7. Tonight, I’d really rather ______________. I want to get a good night’s sleep for the first time all week 8. I don’t want to do anything energetic. I’d rather______________.
căn bậc hai số học của (-3)^2 là
Theo em tại sao câu thơ "câu hát căng buồm với gió khơi " lại có nội dung tương tự như câu thơ trích trong khổ thứ nhất( bài "Đoàn thuyền đánh cá")
Đọc đoạn văn và khoanh vào đáp án đúng nhất
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