| Aspect | Endothermic Reaction | Exothermic Reaction |
|---|---|---|
| Definition | A reaction that absorbs heat from its surroundings. | A reaction that releases heat to its surroundings. |
| Energy Change | Absorbs energy (heat) from the surroundings, resulting in a net gain of energy. | Releases energy (heat) to the surroundings, resulting in a net loss of energy. |
| Temperature Change | The temperature of the surroundings decreases. | The temperature of the surroundings increases |
| Example | Photosynthesis: 6CO2 + 6H2O + light = C6H12O6 + 6O2 | Combustion of methane: CH2 + 2O2 = CO2 + 2H2O + heat |
| Reaction Diagram | Reactants have lower energy than products; energy is absorbed. | Reactants have higher energy than products; energy is released. |
| Common Features | Requires continuous supply of energy (e.g., heat) to proceed. | Releases energy that can be used to do work or generate heat. |
| Example in Daily Life | Cooking food, photosynthesis in plants. | Burning of fuels, respiration in living organisms. |