d. (2 points) Benzaldehyde has a boiling point of about 180 oC, which usually too high for a simple distillation because the aldehyde oxidizes rapidly at this high temperature. Yet, distillation commonly used to purify crude benzaldehyde. How can the experimenter accomplish this

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false