Chemistry Energy Changes Or Chemical Energetics
Quiz: Fullscreen Mode Quiz 2: Fullscreen Mode Chemistry Energy Changes Or Chemical Energetics 🌡️ CHEMISTRY: ENERGY CHANGES 1. Exothermic & Endothermic Reactions Exothermic: Reaction that releases heat to surroundings → Temperature RISES → ΔH is NEGATIVE (ΔH Endothermic: Reaction that absorbs heat from surroundings → Temperature FALLS → ΔH is POSITIVE (ΔH > 0) Type Heat Flow Temperature ΔH Sign Examples Exothermic OUT ↗ RISES ↑ NEGATIVE (−) Combustion, respiration, neutralization Endothermic IN ↘ FALLS ↓ POSITIVE (+) Photosynthesis, thermal decomposition 2. Enthalpy Change (ΔH) Enthalpy Change (ΔH): Transfer of thermal energy during a reaction, measured in kilojoules (kJ) Main Formula: ΔH = Total energy of products − Total energy of reactants Example 1 (Exothermic): Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s) ΔH = −150 kJ (negative = heat released) Example 2 (...