A chemical change involves a change in the chemical composition of a substance, leading to the formation of new substances. In the case of a chocolate chip cookie, the options you've listed can be categorized as follows:
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Carefully prying the chocolate chips out of the cookie - This is a physical change, as the cookie and the chocolate chips remain chemically the same.
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Breaking the cookie into crumbs - Again, this is a physical change; the cookie is simply being altered in size, not in its chemical composition.
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Dunking the cookie in milk - This is primarily a physical change as well, although there may be some minor chemical interactions between the cookie and the milk, but these don't significantly alter the cookie itself.
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Eating the cookie - This is the best option for representing a chemical change because, during digestion, the cookie undergoes chemical transformations as it is broken down into nutrients in the body.
Therefore, the action that will cause a chemical change to a chocolate chip cookie is eating the cookie.
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