In a lab there are two different samples, which are the followingSample A is 100.g of a coarse grey powder with a faint unpleasant smell. 15.g of the powder are dissolved in ethanol. 0.5mg of the resulting black solution is carefully dropped onto a thick sheet of paper laid flat in a tray. After 30 minutes the initial round black stain has spread out and faded in color to a deep purple. Additionally, there is a dark green ring surrounding the inner stain. Sample B is a solid yellow cube with a total mass of 50.0g. The cube is divided into two smaller 25.0g subsamples, and the minimum volume of water needed to dissolve each subsample is measured. The first subsample just barely dissolved in 101.mL of water, the second in 92.mL. When the experiment is repeated with a new 50.0g. sample, the minimum volume of water required to dissolve the two subsamples is 89.mL and 93.mL. Determine whether each is a mixture, pure substance, or can't decide.