For any reaction to occur, even a
downhill reaction, some energy must be added to get the reaction going.
This energy is needed to break bonds in the reactant molecules. The
energy is then released when the bonds in the product molecules form.
The energy needed to start a chemical reaction is called the energy of
activation (EA). This required energy input represents a
barrier that prevents even energy-releasing exergonic reactions from
occurring without some added energy.
Oct 21st, 2014
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