Physical Changes:

* Melting: Solid to liquid (e.g., ice melting)

* Boiling: Liquid to gas (e.g., water boiling)

* Sublimation: Solid to gas (e.g., dry ice turning into carbon dioxide gas)

* Evaporation: Liquid to gas (e.g., water evaporating from a puddle)

* Dissolving certain salts: Like ammonium nitrate in water (feels cold)

Chemical Reactions:

* Photosynthesis: Plants use sunlight to convert carbon dioxide and water into glucose and oxygen.

* Decomposition reactions: Breaking down a compound into simpler substances (e.g., the decomposition of calcium carbonate into calcium oxide and carbon dioxide).

* Neutralization reactions: The reaction of a strong acid and strong base, releasing heat.

* Many reactions involving breaking bonds: Breaking bonds requires energy input, making the reaction endothermic.

Other Examples:

* Cooking food: The process of heating food requires energy.

* Sweating: Your body releases sweat, which absorbs heat from your body and evaporates.

* Melting ice packs: These often contain ammonium nitrate, which absorbs heat from the environment as it dissolves.

Key Idea:

Endothermic processes *absorb* heat from their surroundings, causing the temperature of the surroundings to decrease.

Let me know if you'd like more details on any of these!