Cho hỗn hợp các ankan sau: pentan (sôi ở 36°C), hexan (sôi ở 69°C); heptan (sôi ở 98°C), octan (sôi ở 126°C). Có thể tách riêng từng chất khỏi hỗn hợp bằng cách nào sao đây?

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the word that has the underlined part pronounced differently from the rest:

  speech                   teacher                    each                     school

• Choose one sentence that has the same meaning as the root one:

  The power failed while we were having dinner at a restaurant.
  
  

• Choose the word that has the underlined part pronounced differently from the rest:

  always                  word                        answer                     software

• Choose the word that has the underlined part pronounced differently from the rest:

  constantly                 apply                   lovely                    specially

• Choose the correct sentence which is built from the words and phrases given:

  Deaf-mute / term / use / identify / person / deaf / have / degree of speaking ability.
  
  

• Choose a word that has different stress pattern:

  passage                           rapid                         prepare                        story

• Choose a word that has different stress pattern:

  existence                           character                         scientist                         interesting

• Choose a word that has different stress pattern:

  fascinate                             suggestion                              titanic                       detective

• Choose a word that has different stress pattern:

  voyage                       suppose                        tragic                       iceberg

• Choose the word that has the underlined part pronounced differently from the rest:

  game                          gnat                        gain                     organize