The following models illustrate chemical reactions between x (red atoms) and y (blue atoms). the "? " mark in each frame represents the amount of unreacted starting material. enter the answers as the number of starting materials and the type (i. e., 1y, 2x, 3y, or 2x2). assume that molecules will not break down into atoms unless a chemical reaction occurs. excess molecules will stay in molecular form. if there are no leftover reactants, enter a value of 0.