Hess' Law Revision

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  • Created by: ElishaG
  • Created on: 04-04-17 18:14
What does Hess' Law State?
The enthalpy change of a reaction depends only on the initial and final states and is independent of the route taken.
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What is average bond enthalpy?
The average bond enthalpy change that takes place when breaking, by homolytic fission, 1 mol of a given type of bond in the molecules of a gaseous species.
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In an enthalpy cycle constructed using bond enthalpies, which direction do the arrows go?
Reactants arrow pointing up to atoms. Products arrow pointing up to atoms.
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If bond enthalpy of the products is greater than the bond enthalpy of the reactants, is the reaction endothermic or exothermic?
Exothermic
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What is (Standard) Enthalpy Change of formation?
The enthalpy change that takes place when 1 mole of a compound is formed from its constituent elements.(All reactants and products in their standard states and under standard conditions.
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In an enthalpy diagram for combustion, what direction do the arrows go?
Reactants down to combustion products. Products down to combustion products.
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In an enthalpy diagram for secondary formation, what direction do the arrows go?
From elements down to reactants and products.
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Other cards in this set

Card 2

Front

What is average bond enthalpy?

Back

The average bond enthalpy change that takes place when breaking, by homolytic fission, 1 mol of a given type of bond in the molecules of a gaseous species.

Card 3

Front

In an enthalpy cycle constructed using bond enthalpies, which direction do the arrows go?

Back

Preview of the front of card 3

Card 4

Front

If bond enthalpy of the products is greater than the bond enthalpy of the reactants, is the reaction endothermic or exothermic?

Back

Preview of the front of card 4

Card 5

Front

What is (Standard) Enthalpy Change of formation?

Back

Preview of the front of card 5
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