What does this represent about the type of change happening in the container? Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes.

The change from red to blue indicates that a new substance with different properties formed, which is evidence of a chemical change. Since the solution began changing color as soon as the substances were mixed, the chemical change started immediately. It was complete when the solution was fully blue eight minutes later, so choice C is correct.

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