Final answer:
Indicators of a chemical change include formation of a substance in a different state, production of flames, and production of heat or light, signifying that a new substance with different properties has been formed.
Step-by-step explanation:
Observations that might indicate a chemical change has occurred include the formation of a substance in a different state, production of flames, and production of heat or light. during a chemical change, you may see unexpected color changes, temperature changes, light production, bubbles formation (without boiling), and precipitate formation. In contrast, breaking, melting, or a phase change are typically associated with physical changes and not chemical reactions.
Examples of chemical change include a piece of paper burning (production of flames and new substances), neutralization reactions in chemistry (often producing heat and/or a gas), or a color change in a reaction indicating a new substance has been formed.