Question

1. record the different types of evidence that indicate a chemical change has occurred.

Explanation:

These are observable signs that a new substance has formed via a chemical reaction, rather than just a physical change.

Answer:

1. Color change (e.g., rust forming on iron, a blue solution turning clear)
2. Formation of a precipitate (a solid forming from mixing two liquids)
3. Gas production (bubbles, fizzing, or an odor being released)
4. Temperature change (the system gets hotter or colder, indicating energy release/absorption)
5. Light production (e.g., a glow from a chemical reaction like bioluminescence)
6. Formation of a new substance with distinct properties (e.g., burning wood producing ash and smoke)