Which one of the following compounds is insoluble in water? a) Na2CO3

b) K2SO4

c) Fe(NO3)3

d) ZnS

Does the number of ions in solution increase, decrease, or remain constant? it continuously decreases. it continuously increases. it decreases at first, then increases. it increases at first, then decreases.

Which radioisotope is used to date fossils? a. oxygen-16 b. carbon-14 c. uranium-238 d. carbon-12

50 points! need answer asap. what type of organic compound contains the following functional group? (2 points)