Use the table of observed changes to answer the question.
Change # Reacts with another substance? Temperature change? Gas, sound, or light produced? New substance formed?
1 yes yes yes yes
2 no yes yes no
3 yes yes yes yes
4 no no no no
Which changes shown in the table are physical changes?
Changes 2 and 4 are physical changes.
The physical changes shown in the table are:
Change #2: In this change, although a substance reacts with another substance and there is a temperature change and the production of gas, sound or light is observed, no new substance is formed.
Change #4: In this change, there is no reaction with another substance, no temperature change, and no gas, sound, or light is produced. Therefore, it is a physical change.