4.5.1.3 The energy change of reactions
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9 Terms
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Each line represents a bond, two lines represent a double bond e.g. in the oxygen molecule.
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During a chemical reaction what is needed
* Energy must be supplied to break bonds in the reactants
* Energy is released to form bonds in the products.
* Energy is released to form bonds in the products.
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bond energies
The energy needed to break bonds and the energy released when bonds are formed can be calculated from bond energies.
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overall energy change of the reaction.
The difference between the sum of the energy needed to break bonds in the reactants and the sum of the energy released when bonds in the products are formed is the overall energy change of the reactio
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In an exothermic reaction,
the energy released from forming new bonds is greater than the energy needed to break existing bonds
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In an endothermic reaction
the energy needed to break existing bonds is greater then the energy released from forming new bond
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How do we calculate the overall energy change of a reaction
It is the difference between the sum of the energy needed to break bonds in the reactants and the sum of the energy released when bonds in the products are formed
reactants- products= overall energy change
\-x exothermic - burning
\+x endothermic
reactants- products= overall energy change
\-x exothermic - burning
\+x endothermic
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bond breaking
energy in
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bond making
energy out