Question
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
A.
physical change involving chemical reactions.
B.
chemical change involving phase changes.
C.
chemical change involving chemical reactions.
D.
physical change involving phase changes.
A.
physical change involving chemical reactions.
B.
chemical change involving phase changes.
C.
chemical change involving chemical reactions.
D.
physical change involving phase changes.
Answers
GPT-4o mini
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.
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.