Question

Question
Which of the following demonstrates a chemical change?(1 point)
Responses

dry ice vaporizing
dry ice vaporizing

iron (Fe) reacting to water((H2O)
) and oxygen(O) to form iron oxide(Fe2O3
)
iron (Fe) reacting to water(open paren cap h sub 2 cap o close paren) and oxygen(O) to form iron oxide(cap f e sub 2 cap o sub 3)

steam condensing on a mirror
steam condensing on a mirror

sugar and water mixing to create sugar water
sugar and water mixing to create sugar water

Answer 1

iron (Fe) reacting to water (H2O) and oxygen (O) to form iron oxide (Fe2O3)

Reason: rusting produces a new substance (iron oxide) with different properties — a chemical change. The others are physical changes (phase changes or dissolution) with no new substance formed.