Here's why:
* Endothermic reactions absorb heat from their surroundings. This makes the surroundings feel cooler.
* Exothermic reactions release heat into their surroundings. This makes the surroundings feel warmer.
Examples:
* Endothermic: Melting ice (absorbing heat to change from solid to liquid)
* Exothermic: Burning wood (releasing heat and light)
To determine whether a reaction is endothermic or exothermic, you need to consider the change in enthalpy (ΔH).
* ΔH < 0: Exothermic reaction (heat is released)
* ΔH > 0: Endothermic reaction (heat is absorbed)
