Question
which observation most likely indicates that only a chemical change has taken place
states of matter changes
reaction occurs
shape changes
change cannot be reversed
states of matter changes
reaction occurs
shape changes
change cannot be reversed
Answers
GPT-4o mini
The observation that most likely indicates that only a chemical change has taken place is "change cannot be reversed."
Chemical changes typically involve the formation of new substances and often cannot be reversed by simple physical means. In contrast, physical changes, like changes in states of matter or shape, can often be reversed. While a reaction occurring is also indicative of a chemical change, it does not solely confirm it since some physical processes can also involve reactions (e.g., dissolving). Thus, the irreversibility of a change is the strongest indicator of a chemical change.
Chemical changes typically involve the formation of new substances and often cannot be reversed by simple physical means. In contrast, physical changes, like changes in states of matter or shape, can often be reversed. While a reaction occurring is also indicative of a chemical change, it does not solely confirm it since some physical processes can also involve reactions (e.g., dissolving). Thus, the irreversibility of a change is the strongest indicator of a chemical change.