What makes displacement reactions of metals in acids exothermic?

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SUMMARY

The discussion centers on the exothermic nature of displacement reactions of metals in acids, specifically focusing on the reaction of magnesium with hydrochloric acid (HCl). The reaction can be represented as Mg + 2HCl → MgCl2 + H2 + x kJ, indicating that heat is released during the process. This release of heat is attributed to the formation of new bonds in the products, which releases energy, thus making the reaction exothermic. Hess's Law is utilized to calculate the enthalpy changes associated with these reactions.

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  • Understanding of Hess's Law and its application in thermochemistry
  • Knowledge of chemical reaction types, particularly displacement reactions
  • Familiarity with enthalpy changes and exothermic reactions
  • Basic principles of acid-metal reactions
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LSJ
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Bah, template doesn't apply to this.

In a lab report, we were using Hess's Law to calculate enthalpies using a few reactions we did in class, one of which was magnesium in hydrochloric acid. The question was to explain why the change is exothermic.

What exactly is it about displacement reactions of metals in acids that makes them exothermic?



In this case,

Mg + 2HCl --> MgCl2 + H2 + xkJ
 
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well heat is produced so...
 

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