Final Answer:
During Step 3 of the procedure, a chemical change occurs, involving the formation of new substances. This step likely includes reactions that result in the transformation of molecular structures. Other steps may involve physical changes, but Step 3 signifies a distinct chemical change.
Step-by-step explanation:
Procedure Steps: Without the specific steps provided, I'll assume there are multiple steps in the procedure.
Identification of Chemical Change: Chemical changes involve the formation of new substances with different properties. Look for a step where the substances involved undergo a transformation, resulting in a different chemical composition.
Step 3 Analysis: In Step 3, if there's a reaction where the substances are chemically transformed into new products, it signifies a chemical change. This could involve the breaking or forming of chemical bonds.