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B3: Cho 9,4(g) oxit kim loại R(I) phản ứng vừa đủ với dd chứa 9,8(g)axit sunfuric loãng (H2SO4). Sản phẩm thu được là muối sunfat R2SO4 và nước. a.Tim công thức của oxit trên( R2O) b. Tính khối lượng muối sunfat bằng 2 cách B4: Cho 8 (g) Fe2O3 khử bởi khí H2 thu được 3 (g) Fe. Tính H phản ứng.

Em hãy hoá thân thành một người dân trong làng của Mtao Mxay đã chứng kiến và kể lại cuộc chiến giữa Đăm Săn và Mtao Mxay

Giải hộ em bài vs ạ đây là bài kiểm tra ạ

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Bài 3: Hãy nêu ý nghĩa của các công thức hóa học sau: a)Khí cacbonic CO2 c) Khí ozon O3 a)Thuốc tím KMnO4 d) Nhôm oxit Al2O3 (Biết O=16 ; C=12 ; K=39 ; Mn=55 ; Al=27)

I.Put the verbs in brackets in the correct tense form. 1. My sister (go) _________ to school at 7 o’clock every morning. 2. A:What_________you (do) _________, Hoa? B: I’m helping my mum with the housework. 3. We can’t go out now. It (rain) _________ very hard. 4. How _________ you (go) _________ to school every day? 5. My sister likes (cook) _________ very much. 6. _________your sister (listen)_________ to music in her free time? 7. Someone (knock) _________ at the door. Can you answer it? 8. Minh usually (do) _________ his homework in the evening. 9. Our school (be) _________ surrounded by mountains. 10. I (like) _________ maths but I (not like) _________ English.

11. His knowledge of history of art is _________ours. A. the same as B. very same as C. like same as D. more same as 12. Their kind of music is _____ mine. A. different with B. so different to C. as different than D. different from 13Some people think the band's rock and roll songs are very lively. They are _______ some of their gentle old songs.. A. the same as B. different from C. not as far as D. as much as 14. I love dancing, and my sister loves it, ________. A. so B. too C. neither D. either 15. He can't play the saxophone, and his brother can't __________ . A. either B. neither C. so D. too 16. No one else in the class plays the guitar John. A. as well B. as far as C. so well as D. as soon as 17. The Brit School is the most famous arts school in Britain. A. performing B. performance C. perform D. performed 18. Jane is not her brother. A. more intelligent as B. intelligent as C. so intelligent as D. so intelligent that 19. Since the 1970s, the festival in Glastonbury has taken almost every year and has grown in size. A. part B. place C. note D. notice 20. He drives as his father does. A. careful as B. more carefully C. the most careful D. carefully as 21. Dong Ho paintings are made on paper with beautiful colors. A. traditional – nature B. tradition - natural C. tradition – nature D. traditional - natural 22. I’ll be there I can. A. sooner as B. no sooner as C. as soon as D. soonest as Giúp em với ạ

Câu 7 : công thức hóa học của Iron (II) chloride FeCl2 cho biết ý nghĩa gì ? ( biết Fe = 56 , Cl = 35,5 )