FeCl2 (s) + ___ K2S (aq)=

Can someone me with questions 15 to 17 plz.

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.