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.
chemical change involving phase changes.
B.
physical change involving phase changes.
C.
chemical change involving chemical reactions.
D.
physical change involving chemical reactions.
A.
chemical change involving phase changes.
B.
physical change involving phase changes.
C.
chemical change involving chemical reactions.
D.
physical change involving chemical reactions.
Answers
GPT-4o mini
The experiment described involves heating water, which causes some of it to evaporate. The reduction in the volume of water from 10 mL to 6 mL indicates that the water has changed from a liquid to a vapor (steam), which is a phase change.
Since this process does not involve any change in the chemical composition of the water (H2O remains H2O), it is classified as a physical change.
Thus, the correct answer is:
**B. physical change involving phase changes.**
Since this process does not involve any change in the chemical composition of the water (H2O remains H2O), it is classified as a physical change.
Thus, the correct answer is:
**B. physical change involving phase changes.**