150mL of saturated SrF2 solution is present in a 250ml beaker at room temperature. The molar solubility of SrF2 at 298K is 1.0 x 10-3M. What are the concentrations of Sr2+ and F in the beaker?

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

Can someone me with questions 12 and 13 plz.

Using the periodic table, complete the table to describe each atom. type in your answers