Tiến hành các thí nghiệm sau: (1)       Nhúng thanh sắt nguyên chất vào dung dịch CuSO₄; (2)       Nhúng thanh sắt nguyên chất vào dung dịch H₂SO₄ có hòa tan vài giọt CuSO₄; (3)       Nhúng thanh sắt nguyên chất vào dung dịch Fe₂(SO₄)₃. (4)       Đốt cháy bột sắt trong oxi; (5)       Ngâm một chiếc đinh làm bằng thép vào dung dịch NaCl. Số trường hợp xảy ra ăn mòn điện hóa là:  

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  The host country, Laos, is expected to announce official sports for 25th SEA Games ____________ November 2008.
   

• Choose the best answer for the following sentence:

  Vietnam recommended archery, vovinam, billiards-snooker and canoeing _____________ official sports at the games.
   

• Choose the best answer for the following sentence:

  The Party and State leaders, delegates, domestic and international guests, and 11 sports delegations _____________ Southeast Asian countries to the 22nd SEA Games were warmly welcomed.
   

• Choose the best answer for the following sentence:

  Johnny used to be one of the most _____________ athletes in my country.
   

• Choose the best answer for the following sentence:

  ______________, the athlete broke the world’s record with two attempts.
   

• Choose the best answer for the following sentence:

  On behalf of the referees and athletes, referee Hoang Quoc Vinh and shooter Nguyen Manh Tuong swore to an oath of “ _______________, Honesty and Fair Play”.
   

• Choose the best answer for the following sentence:
  
   The ASEAN Para-Game is biannual multi-sport _______________ held after every Southeast Asian Games for athletes with physical disabilities.

   

• Choose the best answer for the following sentence:

  In beach volleyball, Indonesia defeated Thailand in straight sets to take men’s gold .
   

• Choose the best answer for the following sentence:

  Viet Nam’s successful hosting of the 22nd SEA Games is considered a/an ____________ example for other countries to follow, particularly in honesty, con-sistence and organizing method.
   

• Choose the best answer for the following sentence:

  _______________ you study for these exams, _____________ you will do.