Viết PTHH biểu diễn sự cháy trong oxi của các chất . Sắt , nhôm , photpho sản phẩm là những hợp chất lần lượt có công thức hóa học : Fe3O4, Al2O3 , P2O5

2 câu trả lời

`#nam`

Ta có các `PTHH :` phản ứng cháy : 

`+)` Sắt

$3Fe + 2O_2\xrightarrow{t^o}Fe_3O_4$

`+)` Nhôm

$4Al+3O_2\xrightarrow{t^o}2Al_2O_3$

`+)` `Photpho`

$4P+5O_2\xrightarrow{t^o}2P_2O_5$

Đáp án:

`-Sắt`

`3Fe+2O_2`  $\xrightarrow[]{t^o}$ `Fe_3O_4`

`-Nhôm`

`4Al+3O_2` $\xrightarrow[]{t^o}$ `2Al_2O_3`

`-Photpho`

`4P+5O_2` $\xrightarrow[]{t^o}$ `2P_2O_5`

Câu hỏi trong lớp Xem thêm

Question 1: Did you see that _______ about wildlife in Africa on television last week? A. documentary B. history C. slapstick D. soap opera Question 2: All three TV channels provide extensive _______ of sporting events. A. broadcast B. coverage C. network D. vision Question 3: We hope to bring you further news of this in our next _______ at midnight. A. bulletin B. article C. episode D. piece Question 4: We covered a wide _______ of topics in the interview. A. collection B. extend C. number D. range Question 5: VTV Channel 3 tries to _______ for all tastes. A. regard B. furnish C. cater D. suit Question 6: We are interrupting this program for a news _______. A. alarm B. flash C. alert D. signal Question 7: I must remember to _______ my TV license next week. A. renew B. regain C. replace D. retain Question 8: The _______ comedy in the silent films was especially funny. A. clownish B. mocking C. witty D. slapstick Question 9: The program was so successful that a _______ series is being made. A. after-effect B. backup C. follow-up D. by-product Question 10: There are several TV _______ in Vietnam, and all of them allow advertising. A. channels B. canals C. broadcasts D. screens Question 11: Violent programs on TV may have a bad _______ on children. A. control B. influence C. power D. pressure Question 12: There is a fault at our television station. Please do not _______ your set. A. adjust B. change C. repair D. switch Question 13: The laughter on many comedies on TV isn’t real laughter, it’s _______ laughter. A. bottled B. canned C. corked D. wrapped Question 14: There are many _______ on television where a team of people have to answer questions. A. inquiries B. puzzles C. quizzes D. riddles Question 15: The poor reception on your TV is probably due to outside _______. A. interference B. interception C. interruption D. intervention

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