Complete and balance the molecular equation, including phases, for the reaction of aqueous sodium sulfate, na2so4, and aqueous barium nitrate, ba(no3)2.

List four observations that indicate that a chemical reaction may be taking place

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

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure