a reaction that produces heat is called and the sign of the enthalpy change is .

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15-11-2022
Chemistry

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a reaction that produces heat is called and the sign of the enthalpy change is .

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kumarprabhat kumarprabhat · Answer 1 · 2022-11-19T15:01:37-05:00

Exothermic Reaction produces heat. The change in enthalpy, ΔH, for an exothermic reaction will always be negative.

Because the total energy of the products is lower than the total energy of the reactants, an exothermic reaction releases energy. A reaction for which the overall standard Gibbs energy change ΔG⚬ is negative. A chemical system's energy is essentially represented by its enthalpy. The heat q that is moved out of (or into) a closed system at constant pressure without any electrical energy input or output is equivalent to the enthalpy change (H) for that reaction. Using calorimetry, such as with a bomb calorimeter, one may determine how much heat is produced or absorbed during a chemical reaction. Reaction calorimeters are frequently used laboratory instruments for measuring heat transfer into or out of reaction vessels. A combustion reaction's heat release and associated energy change, H, can be measured very precisely.

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