Question

lisa had an unknown clear liquid in a beaker. after heating on a hot plate the liquid evaporated, but a white solid was left inside the beaker. based on lisas investigation, the original clear liquid was most likely ___.
a. a mixture
b. very reactive
c. water
d. a pure substance

Explanation:

When a liquid evaporates leaving a solid residue, it indicates that the original liquid was a mixture. A pure substance would evaporate completely without leaving any residue. Water is a pure - substance and would not leave a solid behind after evaporation. If it were very reactive, the reaction products would likely be more complex and not just a simple solid left after evaporation.

Answer:

A. a mixture