AS 2 Chemistry Energetic

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Exothermic Reaction
A reaction in which the enthalpy of the products is less than the enthalpy of the reactants
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Endothermic Reaction
A reaction in which the enthalpy of the products is greater than the enthalpy of the reactants
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Standard Condition
298k (25C) and 100kPa (1 atm)
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Standard Enthalpy Change
The change in heat energy at constant pressure, measured under standard condition
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Enthalpy Diagram
X axis - Progression of reaction
Y axis - Enthalpy /H
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Standard Enthalpy of Combustion/ Formation/ Neutalisation
The enthalpy change when one mole of : a substance is completely burnt in oxygen under standard conditions/ a compound is formed from its elements under standard conditions/ water is produced in neutralisation reaction under standard conditions (298K, 100
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Hess's Law
The total enthalpy change for a reaction is independent of the route taken provided the initial and final conditions are the same
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Average Bond Enthalpies
This is the average bond enthalpy required to break one mole of a given compound averaged over many compounds
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TIP
Neutralisation is exothermic
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Other cards in this set

Card 2

Front

Endothermic Reaction

Back

A reaction in which the enthalpy of the products is greater than the enthalpy of the reactants

Card 3

Front

Standard Condition

Back

Preview of the front of card 3

Card 4

Front

Standard Enthalpy Change

Back

Preview of the front of card 4

Card 5

Front

Enthalpy Diagram

Back

Preview of the front of card 5
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