Example: A mixture of sodium and chlorine to yield table salt produces 411 KJ of energy for each mole of salt produced.
2Na(s) + Cl2(s) --> 2NaCl(s) + energy
Endothermic reactions:
An endothermic reaction is a reaction that involves the absorption of energy in the form of heat.
These chemical reactions lower the temperature of their surrounding area, thereby creating a cooling effect.
The temperature of an isolated system decreases while the surroundings of a non-isolated system gain heat, resulting in an overall positive quantity for the heat of reaction.
Example: Ammonium chloride dissolved in water dissociates into ammonium and chloride ions by absorbing heat from the surroundings.
NH4Cl (s) + H2O (l) ⟶ NH4Cl (aq) - Heat
Therefore, an exothermic reaction is a reaction that involves the release of energy in the form of light or heat and an endothermic reaction is a reaction that involves the absorption of energy in the form of heat.
Summary:
What does one mean by exothermic and endothermic reactions? Give examples.
An exothermic reaction is a reaction that involves the release of energy in the form of light or heat and an endothermic reaction is a reaction that involves the absorption of energy in the form of heat.
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