A molecule contains 18 atoms and undergoes a physical change. How does the physical change affect the total number of atoms of each element?
A. It remains the same.
B. It increases
C. It changes to zero.
D. It decreases
Answer (1)
During a physical change, the total number of atoms of each element in a molecule remains unchanged. For instance, when ice melts to water, the number of H2O molecules and their respective atoms does not vary. Therefore, the correct answer is that it remains the same. ;
