Question

physical vs. chemical change quick check
while camping, you make a snack over a campfire. you roast a marshmallow over the campfire until it is browned between some chocolate and graham crackers. when you take a bite, you notice that the chocolate and marshmallow melted slightly.
which statement correctly identifies a part of this process as a physical or a chemical change?
(1 point)
the digesting of the food is a physical change.
the melting of the chocolate is a chemical change.
the burning of the wood for the campfire is a physical change.
the toasting of the marshmallow is a chemical change.

Explanation:

Physical changes involve a change in physical state (like melting) without altering the chemical composition. Chemical changes result in the formation of new substances with different chemical properties. Digesting food is a chemical change as it involves breaking down substances chemically. Melting chocolate is a physical change as it only changes from solid to liquid without forming new substances. Burning wood is a chemical change as it forms new substances like ash and carbon - dioxide. Toasting a marshmallow is a chemical change because heat causes chemical reactions in the marshmallow, changing its chemical composition.

Answer:

The toasting of the marshmallow is a chemical change.