What are the four indications to recognize the chemical reaction?

Five indicators of a chemical change are color change, temperature change, precipitate formation, gas bubble formation and smell or taste change. Since some chemical products are poisonous, detecting a chemical reaction via smell or taste change is not recommended.

Is there a diagram/picture you can provide? it seems this question goes along with a

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.