Question

which of the following is an example of chemical reaction? putting milk in coffee coloring frosting with blue food coloring an apple that turns brown after a bite is taken

Explanation:

A chemical reaction involves the transformation of substances at the molecular level. When an apple turns brown after a bite, it's due to the oxidation of polyphenol compounds in the apple (like phenols) in the presence of oxygen and enzymes (such as polyphenol oxidase). This results in the formation of new substances (oxidized products), which is characteristic of a chemical reaction. Putting milk in coffee is a physical mixing (no new substance formed chemically). Coloring frosting with blue food coloring is also a physical mixing (the food coloring just disperses in the frosting, no chemical change at the molecular level to form new substances).

Answer:

an apple that turns brown after a bite is taken