Đáp án:
Giải thích các bước giải:a) 4Na +O2 -->2Na2Ob) 4K + O2 --> 2K2Oc) 2H2 + O2 --> 2H2Od) 4Ag + O2 --> 2Ag2Oe) 2Ca + O2 --> 2CaOh) 2Ba +O2 --> 2BaOi) 2Zn + O2 --> 2ZnOk) 4Al + 3O2 --> 2Al2O3l) 4Si + O2 --> 2Si2Om) 2Cu +O2 --> 2CuOn) 4P + 5O2 -->P2O5o) 4Fe + 3O2 --> 2Fe2O3p) C + O2 --> CO2q) N2 + O2 --> 2NO
Hãy cho mình câu trả lời hay nhất nhé
Oxit axit: CO2 axit tương ứng H2CO3
SO3_______________ H2SO4
N2O5______________ HNO3
Oxit bazo
FeO bazơ tương ứng Fe(OH)3
CuO ________________ Cu(OH)2
Fe2O3______________ Fe(OH)3
Giải thích các bước giải:
Exercise 12: Change into passive voice 1. Somebody has stolen my bike. → …………………………………………………………….. 2. They have postponed the class meeting. → ……………………………………………… 3. They have built a new school near our house. → …………………………………………… 4. Has somebody informed Lan of the change? →……………………………………………… 5. They haven’t finished their assignments. → …………………………………………………
Tình hình nước ta trước khi pháp đánh Bắc Kì lần 2 ntn ?
Viết đoạn văn (khoảng 6-8 câu) phân tích câu tục ngữ : " Thương người như thể thương thân ". Trong đoạn văn có sử dụng câu đặc biệt
Exercise 11: Active or Passive? Underline the correct verb form. 1. Tom has just promoted / has just been promoted to area manager of East Asia. 2. My father has taken / has been taken English class in the U.S. 3. How many times have you / have you been fired? 4. How much money have you saved / have you been saved for your vacation. 5. My brother has given / has been given tickets to the concert 6. The population of our city has risen / has been risen to nearly one million. 7. A strike has called / has been called by the factory worker. 8. They haven’t offered / haven’t been offered more money by the management.
Tien luong moi thag cua 1 ki su la 2.500.000 dong , nhung moi thang nguoi do chi linh 2.312.500 dong con lai la so tien nop vao quy bao hiem . Hoi moi thang nguoi do nop vao quy bao hiem bao nhieu phan tram luong
Khi bị tác dụng lực vật có thể xảy ra sự biến đổi chuyển động như: - Đang chuyển động chậm thì………….lên. - Đang chuyển động nhanh thì………………. - Đang chuyển động thì……………………… - Đang đứng yên thì…………………………..
B=(x+y/2x-2y-x-y/2x+2y-2y^2/y^2-x^2):2y/x-y
Exercise 9. Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks. “Do not wait for leaders; do it alone, person to person.” Mother Teresa was the founder of the Order of the Missionaries of Charity, a Roman Catholic congregation of women dedicated to (1) ____ the poor. Considered one of the greatest humanitarians of the 20th century, she was officially recognised as Saint Teresa of Calcutta in 2016. Born in 1910, in Skopje, Macedonia, Mother Teresa taught in India (2) ____ 17 years before in 1946 she experienced her “call within a call" to (3) ____ herself to caring for the sick and poor. (4) ____ Teresa enjoyed teaching at the school, she was increasingly upset by the poverty surrounding her in Calcutta: the Bengal famine of 1943 and the outbreak of Hindu/Muslim violence in August 1946. Her order established a nursing home; centres for (5) ____ blind, aged, and disabled; and a leper colony. In 1979 she (6) ____ the Nobel Peace Prize for her humanitarian work. She died in September 1997 and was beatified in October 2003. 1. A. help B. helped C. helping D. helpful 2. for B. since C. after D. from 3. A. allow B. devote C. encourage D. spend 4. A. After B. Until C. Although D. Because 5. A. a B. the C. these D. those 6. A. received B. recognized C. awarded D. presented
viết tích sau dưới dạng luỹ thừa của 1 số nguyên: a/ (-8).(-27).(-125) b/ 64.(-2)^3 .(-7).(-49)
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