I suspect that it is, though the double lines aren't rings. My guess: a TC blow-out pipette? How am I supposed to know? I also have another one with a single dark band on the top. EDIT: It's a big 50 mL pipette, longer than my arm. So, I'm really confused with these bands at the top.

I remember my teacher saying that during E2 (elimination bimolecular) reactions of alkanes, if the strong base that is used as a reagent is a bulky one, it has higher probability of giving a Hofmann (less stable) product as the major product even if there are possibilities for a Saytzeff (or Zait...

here is an answer to a question that should be correct according to me how is sp2 more stable AND more reactive than sp3? [closed] But other community members are misleading it to any other situation that is completely wrong. And also people are leaving anonymous downvotes for anonymous. If someo...

What is the bond energy of H-O? Wikipedia disagrees with itself: On English Wikipedia: 467 kJ/mol On French Wikipedia: 366 kJ/mol What is the right value?