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, the heating of the water leads to evaporation, which is a physical change where water transitions from liquid to gas. There are no chemical reactions occurring; the water is still H₂O before and after heating. The decrease in the volume of water to 6 mL indicates that some of the water has changed to vapor (steam) and has escaped from the test tube.