What is the mass number of an atom that contains 19 protons, 19 electrons, and 20 neutrons?

Compare and contrast physical changes with chemical changes.

An alkaline battery produces electrical energy according to the following equation. zn(s) + 2 mno2(s) + h2o(l) zn(oh)2(s) + mn2o3(s) (a) determine the limiting reactant if 17.5 g zn and 31.0 g mno2 are used. (type your answer using the format ch4 for ch4.) (b) determine the mass of zn(oh)2 produced. _ g

The three types is stress that act on earths rocks are compression, tension, and