Question

iron(iii) thiocyanate spectroscopychemical or physical changethe image below shows an observation of what occurs when light yellow-colored iron(iii) solution mixes with clear thiocyanate solution. the mixture becomes a deep red color.consider what you know about chemical and physical changes to answer the question.which explanation best describes whether combining fe³⁺ and scn⁻ results in a chemical or physical change, and why?physical: there is no noticeable temperature change.chemical: the reaction is an open system.chemical: a color change indicates a new compound forms.physical: the new color is just a combination of old colors.

Explanation:

A chemical change produces a new substance, while a physical change does not. A distinct color change from the original reactants (light yellow and clear) to a deep red mixture, forming the new compound $\ce{[FeSCN]^{2+}}$, is a key indicator of a chemical change. The other options are incorrect: temperature change is not required for a chemical change, system type does not define change type, and the new color is not a simple mix of original colors.

Answer:

Chemical: A color change indicates a new compound forms.