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No, it is not reversible as you can't get the ingredients to make the jelly back. Therefore it is an irreversible change. (first message on Answers.com.)

This is what I thought originally as well; however, jelly is only a disolved into the water. It will change state to a solid when cooled, but, when heated, it will melt. If heated (slowly) the water will evaporate and leave the jelly crytals behind. Sort of like salty water. They might not look the same, but the water will return to its original state. Thus, jelly is a reversible change.

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13y ago

What else can I help you with?