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, if you can. sample a is 100 g of a coarse grey powder with a faint unpleasant smell. 15 g of the powder is put into a funnel lined with a sheet of thick paper. distilled water is poured slowly over the powder. all of the powder disappears, and the water under the funnel turns a deep purple. sample b is 100 ml of a clear liquid. the liquid is heated in a flask until it boils, which starts to happen at 66.2 °c. as the liquid boils, the temperature continues to rise, until the last of the liquid boils away at 76.0 °c. 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.\

Explanation:

Step1: Analyze sample A

The powder dissolves in water and changes water color. But this isn't conclusive.

Step2: Analyze sample B

A pure substance has a constant boiling - point. Since sample B has a boiling - point range (from 66.2 °C to 76.0 °C), it is a mixture.

Answer:

Is sample A made from a pure substance or a mixture? (can't decide)
Is sample B made from a pure substance or a mixture? mixture