An Exothermic reaction releases energy into the surroundings and so the products have more potential energy then the reactants. The enthalpy change is a negative value. Whereas, an endothermic reaction involves the absorption of energy into the system and so the reactants have more potential energy than the products. The enthalpy change is a positive value. This is clearly represented in energy profile diagrams.
Friction .......................................................................................
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Make the question more clear for me
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It probably would have been broken down to smaller pieces and spread out around the world. Hope this help! :)
