Question

read the descriptions below of two substances and an experiment on each. decide whether the result of the experiment tells you the substance is a pure substance or a mixture. - sample a is a solid yellow cube with a total mass of 50.0 g. the cube is divided into two smaller 25.0 g subsamples, and the volume of each subsample is measured. the volume of the first is 4.2 cm³ and the volume of the second is 3.1 cm³. when the experiment is repeated with a new 50.0 g sample, the volumes of the two 25.0 g subsamples is 3.2 cm³ and 3.8 cm³. - sample b is 100. ml of a clear liquid. the density of the liquid is measured, and turns out to be 0.77 g/ml. the liquid is then cooled in the refrigerator. at 10.0 °c crystals begin to appear. the temperature of the liquid continues to decrease as more crystals form, until at 6.2 °c the liquid is entirely solid. is sample a made from a pure substance or a mixture? if the description of the substance and the outcome of the experiment isnt enough to decide, choose \cant decide.\ is sample b made from a pure substance or a mixture? if the description of the substance and the outcome of the experiment isnt enough to decide, choose \cant decide.\ pure substance mixture (cant decide) pure substance mixture (cant decide)

Explanation:

For sample A, the different volumes of the two subsamples suggest it could be a mixture as pure substances have consistent physical - properties like volume per unit mass. For sample B, the consistent density and the defined melting - freezing point behavior are characteristics of a pure substance.

Answer:

Sample A: mixture
Sample B: pure substance