Consider a thin metal rod that carries an excess charge of 45 nC. The rod is 1.5 m long. The left end of the rod is found to be at a potential of 35 V, with respect to an established 0 V reference. What is the electric potential at the other end?

Let a small circle represent an atom of one type of element and a small square represent an atom of a second type of element. make a drawing of (a) a pure substance (a compound) composed of the two elements (in a one-to-one ratio), (b) a homogeneous mixture composed of the two elements, and (c) a heterogeneous mixture composed of the two elements.