A divalent metal ion dissolved in dilute hydrochloric acid forms a precipitate when h2s is bubbled through the solution. Which ion is it? (a) ca2 (b) mn2 (c) zn2 (d) cd2.

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned

What metric units would you use to measure the thickness of a key