Here we are to determine which particle diagram best represents this same substance after a physical change has taken place.
The correct answer is choice 1.
First, a physical change is one which affects only the form of a chemical substance but not it's chemical composition. They are associated with separation of mixtures but not compounds into their constituent elements.
The definition above is basis for the decision that choice 1 from the image in the question best represents this same substance after a physical change has taken place.
This is so because the composition of the particle is altered in all of the other choices.
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