ead the descriptions below of two substances and an experiment on each. Decide whether the result of the experiment tells you the substance is a ure substance or a mixture, if you can. - Sample A is 100. g of a coarse grey powder with a faint unpleasant smell. IS. g of the powder are dissolved in ethanol. 0.5 mg 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 soltd 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. \begin{tabular}{|l|c|} \hline IssampieAmadefromapuresubstanceoramixture? & pure substance \\ Ifthedescriptionofthesubstanceandtheoutcomeoftheexperimentisntenoughtodecide,choose"cantdecide." & mixture \\ \hline IssampieBmadefromapuresubstanceoramixture?Ifthedescriptionofthesubstanceandtheoutcomeoftheexperimentisntenoughtodecide,choose"cantdecide." & pure substance \\ \hline \end{tabular}