Exothermic and Endothermic reactions

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Last updated 6:08 AM on 9/14/26
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13 Terms

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ΔH ?

ΔH is the change in bond enthalpy.  Enthalpy refers to the total internal energy of a system.

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Change in bond enthalpy for exothermic

negative

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Change in bond enthalpy for endothermic

positive

4
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Exothermic (reactants and products)

Reactants have more energy than products

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Endothermic (reactants and products)

Products have more energy than reactants

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Exothermic (Bonds)

More bonds are made than broken

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Endothermic (Bonds)

More bonds are broken than made

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Exothermic (Heat)

Heat is released into the system

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Endothermic (Heat)

Heat is absorbed from the system

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Exothermic (Temprature)

The temperature of the surroundings increases

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Endothermic (Temprature)

The temperature of the surroundings decrease

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Endothermic (states)

Solids --> Liquid --> Gas

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Exothermic (states)

Gas --> Liquid --> Solid.