Question

question 7 of 15 (1 point) | question attempt: 1 of unlimited sample of substance x change 1 change 2 change 3 change 1 is: change 2 is: change 3 is: impossible impossible impossible a physical change a physical change a physical change a chemical change a chemical change a chemical change try one last time

Explanation:

In Change 1, the substance just changes its physical - state or arrangement without altering the molecular structure, so it's a physical change. In Change 2, new molecules are formed, indicating a chemical reaction, so it's a chemical change. In Change 3, the original substance X has a specific molecular structure and it suddenly turns into a completely different set of molecules which is not possible without a proper chemical process described, so it's impossible.

Answer:

Change 1 is: a physical change
Change 2 is: a chemical change
Change 3 is: impossible