What are the formulas for these poly-atomic compounds and how do i find them? ?

copper and nitrate
hydroxide and magnesium
potassium and phosphate
lead and carbonate

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive

What is the molar mass of ca(cio4)2