Question

From the results of laboratory analysis, identify a quantity that the student could use to determine whether the sample was pure.

1) Melting point
2) Boiling point
3) Density
4) Color

Answer 1

The melting point can be used to determine whether a sample is pure or impure.

Step-by-step explanation:

The student could use the melting point as a quantity to determine whether the sample was pure. Pure substances have a sharply defined melting point, whereas impure substances have a temperature range over which they melt. By comparing the measured melting point of the sample to the known melting point of the pure substance, the student can determine if the sample is pure or impure.