Question

the images show two processes. image a: a roasting marshmallow image b: melting ice which statement about the two images is true? image a shows a physical change, and image b shows a chemical reaction. image a shows a chemical reaction, and image b shows a physical change. both images show chemical reactions that are endothermic. both images show chemical reactions that are exothermic.

Explanation:

• Physical change: A change in which no new substances are formed. Melting ice (\(H_2O\) changing from solid to liquid) is a physical change. The chemical composition of water (\(H_2O\)) remains the same.
• Chemical reaction: A process in which new substances are formed. Roasting a marshmallow (which contains organic compounds like carbohydrates) leads to the formation of new substances (e.g., carbon - due to charring).

Answer:

Image A shows a chemical reaction, and image B shows a physical change.