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HienKietLB
2 năm trước
Dùng khí hiđro để khử hoàn toàn 12.15 g kẽm oxit (ZnO) ở nhiệt độ cao a Hãy viết phương trình phản ứng xảy ra b Tính khối lượng kẽm sinh ra sau phản ứng c Nếu thả kẽm trên vào một dd có chứ 20g axit Clohiđric, thì khối lượng kẽmclorua (ZnCl2) thứ được là bao nhiêu Giúp em với ạ . Em sắp phải học onl r ạ
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Các câu hỏi liên quan

Chia động từ trong ngoặc 1. She (travel) .... to work by bus everyday 2. She (travel).... to work by bus now 3. Mr. Quang (drive)..... his car to the farm now 4. He (drive).... his car to the farm every day. 5. His father (take)..... the vegetables to the market every morning 6. He (take) ... the vegetables to the market at present 7. Tam and Ba (play).... soccer at this time 8. They usually (play).... soccer in their free time 9. The children always (walk).... to school and they (walk).... to school now 10. Tan often (ride)... a bike to school. At the moment, he (ride).... it to school 11. I(play).... video games once a week 12. Son (write)... the answers in his exercise notebook now 13. We (learn) .... math on tuesday and we (learn) .... math now 14. Look! It (rain)... 15. Listen! The birds (sing)..... 16 . The tailor always (measure)..... for the new suit 17 . He always (cross).... the street at the corner 18. My family (travel) ..... abroad every summer. 19 . He always (wear)..... a raincoat and (carry).... an umbrella when he walks to the office. 20. Trees.... more quickly in summer than in winter. (grow) 21 . We .... (not /get up) always .... before 7:00. 22 . ‘'How are you getting on with the book?" I usually..... one chapter a day. (read) 23. My brother..... (not/tock) always.... the doors and windows before going to bed 24 . Alice ....her mother in London most weekends. (see) 25 . '’What's that terrible noise?'’ The neighbors often......a party at night (have) 26 . Both ancient and recent records show that farmers usually..... long hours. (work)

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