Classify each of the following chemical reactions. HELP ME PLEASE 1. S+O --> SO2 ? 2. CaC12+2AgNO3 --> Ca(NO3)2+2AgC1 ? 3. Zn+CuSO4 --> Cu+ZnSO4 ? 4. 2Na2O --> 4Na+O2 ?

What is the chemical formula of the following compound

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

What is the molar mass of a gas that has density of 2.054 g/l