Calculate the [H+] if the [OH-] = 3.11 x 10^9 M(same sig figs!)

What are the percent by mass of copper in penny lab

Substance x has a fixed volume, and the attraction between its particles is strong .substance y had widely spread out particles and can be compressed what can most likely be concluded about these substances

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains