Question

physical vs. chemical change quick check
which of the following demonstrates a chemical change? (1 point)
○ steam condensing on a mirror
○ iron (fe) reacting to water((h₂o)) and oxygen(o) to form iron oxide(fe₂o₃)
○ sugar and water mixing to create sugar water
○ dry ice vaporizing

Explanation:

A chemical change results in the formation of new substances with different chemical properties. Steam condensing, sugar - water mixing, and dry ice vaporizing are physical changes as they only involve changes in state or mixing without new substance formation. Iron reacting with water and oxygen to form iron oxide is a chemical change as a new compound (iron oxide) is formed.

Answer:

Iron (Fe) reacting to water ($H_2O$) and oxygen (O) to form iron oxide ($Fe_2O_3$)