Endothermic vs. Exothermic Reactions

🔥 Endothermic vs. Exothermic Reactions

🔥 Exothermic: Releases heat (ΔH is negative) → Feels hot
❄️ Endothermic: Absorbs heat (ΔH is positive) → Feels cold

🧠 Think: "Exo = Exit heat", "Endo = Enter heat" — track energy flow!

🔥 Real-Life Examples

• Exothermic: Combustion, freezing water, condensation
• Endothermic: Melting ice, boiling water, photosynthesis

🧠 Quick Check

Is dissolving ammonium nitrate in water endothermic or exothermic?

⚡ Graph Clues

Exothermic graphs: products have lower energy.
Endothermic graphs: products have higher energy.
📉 Think of a roller coaster drop vs. uphill climb!

🔥 Real AP Connection

If ΔH < 0 and energy is listed as a product, what type of reaction is this?

✏️ Exo = Heat OUT (ΔH negative) | Endo = Heat IN (ΔH positive) → Know the signs!