Question
which observation most likely indicates that only a chemical change has taken place?
1. a reaction occurs
2. the shape changes
3. states of matter changes
4. the change cannot be reversed
1. a reaction occurs
2. the shape changes
3. states of matter changes
4. the change cannot be reversed
Answers
GPT-4o mini
The observation that most likely indicates that only a chemical change has taken place is:
**1. a reaction occurs**
Chemical changes usually involve a reaction where substances are transformed into different substances, resulting in changes to their chemical properties. The other options (shape changes, state changes, and irreversibility) can occur in both physical and chemical changes, making them less definitive indicators of a chemical change.
**1. a reaction occurs**
Chemical changes usually involve a reaction where substances are transformed into different substances, resulting in changes to their chemical properties. The other options (shape changes, state changes, and irreversibility) can occur in both physical and chemical changes, making them less definitive indicators of a chemical change.