Amonomer needed to synthesize polyethylene terephthalate (pet), a polymer used to make plastic sheeting and soft drink bottles, shows a strong absorption in its ir spectrum at 1692 cm−1 and two singlets in its 1h nmr spectrum at 8.2 and 10.0 ppm. what is the structure of this monomer (molecular formula c8h6o4)?

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 are the similarities of physical and chemical change ?

How many grams of mgbr2 are needed to produce 75g or metal?