Mario places 10 mL of water in a test tube and heats the liquid over a Bunsen burner for 2 minutes. After removing the test tube from the Bunsen burner, there are 6 mL of water left in the test tube. This experiment is a good example of a

Question

A.
physical change involving chemical reactions.
B.
chemical change involving phase changes.
C.
chemical change involving chemical reactions.
D.
physical change involving phase changes.

Answer 1

The correct answer is D. physical change involving phase changes.

In this experiment, heating the water causes some of it to evaporate, which is a physical change (the composition of the water remains H₂O throughout the process). The phase change from liquid to gas (water vapor) is what is occurring when the water is heated and subsequently some of it is lost. There are no chemical reactions taking place in this scenario.