Heat of vaporization at the boiling point: water - 539 cal/g; alcohol - 204 cal/g; chloroform - 59 cag/g what probably causes chloroform to have the lowest heat of vaporization?

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

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

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.