To identify physical changes from the table, we need to look for changes where there is no reaction with another substance, no formation of a new substance, and no other indicators of a chemical change such as gas, sound, or light production.
From the provided table:
- Change 1: Reacts with another substance? yes (indicates a chemical change)
- Change 2: Reacts with another substance? no (this may indicate a physical change)
- Change 3: Reacts with another substance? yes (indicates a chemical change)
- Change 4: Reacts with another substance? no (this may indicate a physical change)
Looking at the criteria for physical changes:
- Change 2 has no reaction with another substance, but has a temperature change and produces gas or sound, which typically suggests that it's not just a physical change.
- Change 4 has no reaction, no temperature change, no gas, sound, or light produced, and no new substance formed, which suggests that it is a physical change.
Based on this, the only physical change in the given options is change 4.
Therefore, the correct choice indicating physical changes is:
2 and 4