Solid potassium sulfide is slowly added to 75.0 mL of a cobalt(II) sulfate solution until the concentration of sulfide ion is 0.0660 M. The maximum amount of cobalt(II) ion remaining in solution is M.

18. use the activity series to predict whether the following synthesis reaction will occur. write the chemical equations for the reaction if it's predicted to occur. (s) + o2(g) -> *note: it is possible.*

Can someone me with questions 15 to 17 plz.

What are the 4 phases of matter in order of increasing engery content?