what is exothermic reaction .
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An exothermic reaction is a "reaction for which the overall standard enthalpy change ΔH⚬ is negative." Exothermic reactions usually release heat and entail the replacement of weak bonds with stronger ones. ... Most of the spectacular chemical reactions that are demonstrated in classrooms are exothermic and exergonic. :)
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Explanation:
(i) A reaction in which heat is given away when
reactants are transformed into the products is
called as exothermic reaction.
(ii) e.g. formation of ice from water, dissolution of
sodium hydroxide in water.
(iii) When solid NaOH is dissolved in water, heat
is given out and therefore, the temperature
increases.
(iv) NaOH(s) + H2
O(l) → NaOH(aq) + Heat
Sodium
hydroxide
Water Sodium hydroxide
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