Cho sơ đồ sau:

Si \(\xrightarrow[?]{(1)}\) SiO₂ \(\xrightarrow[?]{(2)}\) Na₂SiO₃ \(\xrightarrow[?]{(3)}\) H₂SiO₃.

Các chất cần lấy trong phản ứng (1), (2), (3) là:

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  The overall situation is good ___________ a few minor problems.

• Choose a word that has different stress pattern:

  imperial                  government                   recognize                 colorful

• Choose a word that has different stress pattern:

  maintenance                    location                       history                   register

• Choose a word that has different stress pattern:

  culture                   famous                   center                  protect

• Choose a word that has different stress pattern:

  atmosphere                      surrounding                      beautiful                      business

• Choose the best answer for the following sentence:

  Local people have mixed feelings about the planned transformation of their town _____________ a regional capital.
   

• Choose the best answer for the following sentence:

  Emperor Akihito of Japan was _______________ in Tokyo.
   

• Choose the best answer for the following sentence:

  A fund has been set up to give ______________ to the town’s cultural sites.
  
  

• Choose the best answer for the following sentence:

  A ____________ is a special place in which vou remember and praise a famous person, who was dead.
   

• Choose the best answer for the following sentence:

  The sea ______________ the sun’s warmth longer than the land