một hỗn hợp A gồm na và fe có khối lượng 10,2g nếu hòa tan hết hỗn hợp này trong nước thì thu được 2,24 lít khí hidro a) tính khối lượng mỗi kim loại trong hỗn hợp A b) nếu hòa tan hết cũng hỗn hợp trên trong dung dịch HCl thì thể tích H2 thu được là bao nhiêu
GIÚP MÌNH VỚI Ạ CHẮC CHẮN ĐÚNG NHÉ KO MÌNH SẼ BÁO CÁO ĐÓ Ạ
a,G=1+5+9+13+......81 b,D=2+7+12+17+...+62 c,(X-3×5)×12=0 d,(X-5)÷3+3=24 e,25×(2×X-4)×12=0 f,X-4:6-5=10 g,(X÷3-3)×(x:6-6)=8
I. Choose the most suitable words underlined a) Jack is/is going to be sixty- five next month so he retires/ will be retiring. b) Quick, here comes a police car! What will we say/are we going to say about the broken window? c) Don’t be so impatient! I’ll just come/I’m just coming. d) I have to be back at 3.30 so I’m leaving/I leave before lunch. e) What do you think you’ll be doing/you’ll do in five years’ time? f) Come on, get a move on, or we’ll miss/we’ll have missed the plane! g) Will you be working/Will you work the week after Christmas? I was thinking of visiting you. B. VOCABULARY AND GRAMMAR I. Choose the best answers to completes each sentence. (10 points) 1. I ____ a driving test next month A. will be having B. will have had C. have D. will have 2. “I’d rather you______ home now.” A. going B. go C. gone D. went 3. “Don’t worry. I have ______ tire at the back of my car.” A. another B. other C. others D. the other 5. Susan’s doctor insists ______ for a few days. A. that she is resting B. her resting C. that she rest D. her to rest 6. We couldn’t fly ______ because all the tickets had been sold out. A. economical B. economy C. economic D. economics + fly economy: bay hạng phổ thông 7. Through an ______, your letter was left unanswered. A. overtone B. overcharge C. overtime D. oversight 8. – “Mum, I’ve got 600 on the TOEFL test.” – “______” A. Good way! B. You are right. C. Oh, hard luck! D. Good job! 9. He ______ to the doctor after the accident, but he continued to play instead. A. must have gone B. should have gone C. couldn’t go D. didn’t have to go 10. I won’t change my mind ______ what you say. A. whether B. no matter C. because D. although 11. “Please, will you just tidy your room, and stop ______ excuses!” A. having B. making C. doing D. taking + make excuse: biện hộ 12. My mother told me to ______ for an electrician when her fan was out of order. A. send B. write C. rent D. turn + send for sb: gọi ai đến 13. “This library card will give you free access ______ the Internet eight hours a day.” A. on B. to C. from D. in 14. The United States consists of fifty states, ______ has its own government. A. each of which B. hence each C. they each D. each of that 15. It is very important for a firm or a company to keep ______ the changes in the market. A. pace of B. track about C. touch with D. up with 16. John paid $2 for his meal, ______ he had thought it would cost. A. not as much B. not so much as C. less as D. not so many as 17. John. “Do you think that we should use public transportation to protect our environment?” -Laura. “______” A. Of course not. You bet! B. Well, that’s very surprising. C. There’s no doubt about it. D. Yes, it’s an absurd idea. 18. The forecast has revealed that the world’s reserves of fossil fuel will have ______ by 2015. A. taken over B. caught up C. used off D. run out 19. Only when you grow up ______ the truth. A. you will know B. you know C. do you know D. will you know 20. – “How do you like your steak done?” – “ ______.” A. I don’t like it much B. Very little C. Well done D. Very much 21. She had to hand in her notice ______ advance when she decided to leave the jo B. A. with B. from C. in D. to 22. They didn’t find ______ in a foreign country. A. it easy to live B. it easy live C. it to live easy D. easy to live 23. “Buy me a newspaper on your way back, ______?” A. will you B. don’t you C. can’t you D. do you ai trả lời sẽ đc ctlhn với 5 sao
Người ta muốn lát gạch 1 nền nhà HCN có chu vi là 32m . Chiều rộng kém chiều dài 4m .Tính số tiền cần lát nền nhà , biết 1 viên gạch 2dm và có giá là 4500 đồng
lập bảng thống kê tiến trình cách mạng tư sản anh thế kỉ 17 giúp mình với
Tóm tắt truyện Cô bé bán diêm theo nhân vật chính Mình cần gấp TvT
Hòa tan hoàn toàn 53,36 gam fe304 bằng dung dịch HCl 0,5M , biết sản phẩm gồm có fecl2, fecl3, và H20 A) Tính khối lượng muối thu được B) tính thể tích dung dịch axit đã dùng C) tính nồng độ mol/l của các chất trong ddsau phản ứng( coi thể tích dd thấy đổi ko đáng kể)
Các tiền bối và các bạn giúp em với ạ. Viết 1 đoạn văn ngắn thôi ạ
Đốt cháy m gam chất X cần dùng 6.4g khí oxi tạo ra 4.4g khí cacbondioxit và 3.6h nước tính khối lượng m Giúp mình mai mình nộp r
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