Here’s a explanation:
Photochemical reactions:
- Caused by light.
- Light excites electrons in molecules, making them react.
- Example: Sunlight helps plants make food (photosynthesis).
Thermal reactions:
- Caused by heat.
- Heat makes molecules move faster so they collide and react.
- Example: Burning wood.
Key difference: Light drives photochemical reactions, heat drives thermal reactions.