Final answer:
Signs of a chemical reaction that can be observed include color change, temperature change, and formation of a gas.
Step-by-step explanation:
In a laboratory experiment, signs of a chemical reaction that can be observed include:
- Color change: For example, when a substance changes from one color to another.
- Temperature change: Such as feeling the container become hot or cold.
- Formation of a gas: Like when bubbles or fizzing is observed.
Learn more about signs of a chemical reaction