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

A. 4 only

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.

chemists can use the electron cloud model to assign electrons to different atomic orbitals. atomic orbitals also explain the patterns in the periodic table

explanation:

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