Question

PLS PLS PLS PLS HELP IM STRUGGLING

Which of the tests above would provide the most useful information to determine whether the sample is a pure substance or a mixture?

A. 4 only
B. 1 and 4
C. 1,2, and 3
D. 1 only

Answer 1

A. 4 only

Step-by-step explanation:

One of the tests for purity is by determining the melting point of a substance. A pure substance has a sharp meting point.

If the solid in question is a pure solid, when it is heated, it will exhibit a sharp melting point. Mixtures however melt over a range of temperatures due to the presence of impurities in the solid.